{"title":"IGS Audio","description":"","products":[{"product_id":"igs-audio-volf","title":"IGS Audio Volf","description":"\u003cdiv lang=\"en\"\u003e\n  \u003cp\u003e\u003cstrong\u003eIGS Audio Volf\u003c\/strong\u003e is a dual-channel stereo Class A FET compressor inspired by the UREI 1176 — the successor to the Volfram with expanded stereo capabilities, switchable transformer\/IC input, and an inline Wet\/Dry control. Compression is handled by BF245A FET transistors in a matched quad arrangement; both gain stages use discrete IGS 2520 op-amps; UTM Industry transformers are fitted on input and output. Attack range of 20 µs to 1.2 ms and release from 50 ms to 1.2 s match the 1176 topology. All controls run on 24-position Elma switches.\u003c\/p\u003e\n\n  \u003ch3\u003eBF245A FET and 1176 Topology — Fast Compression in Stereo\u003c\/h3\u003e\n  \u003cp\u003eA FET as the gain reduction element defines the 1176 character: near-instantaneous response to transients (attack from 20 µs), wide ratio range, and a tonal character described as punchy, aggressive, and sticky at low attack and short release settings. The Volf implements this topology across two channels with a link option for stereo bus compression with coherent imaging. The IC\/UTM Industry transformer input switch selects between a cleaner IC input (less transformer coloration) and the warm, dense character of the transformer path — the difference is most audible at aggressive gain reduction settings. AMP mode bypasses the compression circuit and routes signal through the amplifier stage at 45 dB gain — FET and transformer character without any dynamics control.\u003c\/p\u003e\n\n  \u003ch3\u003eSidechain HPF, Wet\/Dry and All Buttons Mode\u003c\/h3\u003e\n  \u003cp\u003eThe sidechain HPF (60\/90\/120\/180\/240 Hz or Off) decouples low-frequency content from the compression control — essential on bass and mix bus material with heavy kick drum content, where without HPF the compressor pumps rhythmically in time with the low end. The 24-position Elma Wet\/Dry control implements parallel compression inline without external routing or a mix bus. Ratio options include standard 1176 values (4:1, 8:1, 12:1, 20:1) and the All Buttons mode, in which all ratio buttons are engaged simultaneously, producing the aggressive over-compression associated with recordings by Led Zeppelin, Nirvana, and countless others. Maximum gain reduction is 30 dB, maximum gain 45 dB, bandwidth 8 Hz to 22 kHz at ±0.2 dB.\u003c\/p\u003e\n\n  \u003ch3\u003eKEY FEATURES\u003c\/h3\u003e\n  \u003cul\u003e\n    \u003cli\u003eDual-channel stereo Class A FET compressor — inspired by UREI 1176\u003c\/li\u003e\n    \u003cli\u003eCompression element: BF245A FET, matched quad\u003c\/li\u003e\n    \u003cli\u003eDiscrete IGS 2520 op-amps in both gain stages\u003c\/li\u003e\n    \u003cli\u003eSwitchable input: UTM Industry transformers or IC-balanced\u003c\/li\u003e\n    \u003cli\u003eUTM Industry output transformers\u003c\/li\u003e\n    \u003cli\u003eAttack: 20 µs – 1.2 ms (stepped, Elma switch)\u003c\/li\u003e\n    \u003cli\u003eRelease: 50 ms – 1.2 s (stepped, Elma switch)\u003c\/li\u003e\n    \u003cli\u003eRatio: 4:1, 8:1, 12:1, 20:1 + All Buttons mode\u003c\/li\u003e\n    \u003cli\u003eMax gain: 45 dB; max gain reduction: 30 dB\u003c\/li\u003e\n    \u003cli\u003eAMP mode: bypass compression, signal through amplifier at 45 dB\u003c\/li\u003e\n    \u003cli\u003eSidechain HPF: 60 \/ 90 \/ 120 \/ 180 \/ 240 Hz \/ Off (stepped)\u003c\/li\u003e\n    \u003cli\u003eWet\/Dry Mixer — 24-position Elma (inline parallel compression)\u003c\/li\u003e\n    \u003cli\u003eStereo Link: yes\u003c\/li\u003e\n    \u003cli\u003eAll controls stepped — 24-position Elma switches throughout\u003c\/li\u003e\n    \u003cli\u003eInput impedance: 10 kΩ (IC) \/ UTM Industry transformers (switchable)\u003c\/li\u003e\n    \u003cli\u003eOutput impedance: 600 Ω (UTM Industry transformers)\u003c\/li\u003e\n    \u003cli\u003eMax input and output: +18 dBu; operating level: +4 dBu\u003c\/li\u003e\n    \u003cli\u003eInternal linear power supply, 20 W; made in Poland\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003ch3\u003eTECHNICAL SPECIFICATIONS\u003c\/h3\u003e\n  \u003cul\u003e\n    \u003cli\u003eType: dual-channel stereo Class A FET compressor\u003c\/li\u003e\n    \u003cli\u003eCompression element: BF245A FET, matched quad\u003c\/li\u003e\n    \u003cli\u003eInput impedance: 10 kΩ (IC\/UTM Industry transformer, switchable)\u003c\/li\u003e\n    \u003cli\u003eOutput impedance: 600 Ω (UTM Industry transformers)\u003c\/li\u003e\n    \u003cli\u003eOperating level: +4 dBu\u003c\/li\u003e\n    \u003cli\u003eMax input level: +18 dBu\u003c\/li\u003e\n    \u003cli\u003eMax output level: +18 dBu\u003c\/li\u003e\n    \u003cli\u003eMax gain: 45 dB\u003c\/li\u003e\n    \u003cli\u003eMax gain reduction: 30 dB\u003c\/li\u003e\n    \u003cli\u003eNoise level: 110 dB(A)\u003c\/li\u003e\n    \u003cli\u003eAttack: 20 µs – 1.2 ms\u003c\/li\u003e\n    \u003cli\u003eRelease: 50 ms – 1.2 s\u003c\/li\u003e\n    \u003cli\u003eFrequency response: 8 Hz – 22 kHz, ±0.2 dB\u003c\/li\u003e\n    \u003cli\u003eSNR: \u0026gt;84 dB\u003c\/li\u003e\n    \u003cli\u003eTHD: 0.12%\u003c\/li\u003e\n    \u003cli\u003eTHD+N: 0.19%\u003c\/li\u003e\n    \u003cli\u003eCrosstalk: 80 dB\u003c\/li\u003e\n    \u003cli\u003eSidechain HPF: 60 \/ 90 \/ 120 \/ 180 \/ 240 Hz \/ Off\u003c\/li\u003e\n    \u003cli\u003ePower: internal linear PSU, 20 W\u003c\/li\u003e\n    \u003cli\u003eMade in: Poland\u003c\/li\u003e\n  \u003c\/ul\u003e\n\u003c\/div\u003e","brand":"IGS Audio","offers":[{"title":"Default Title","offer_id":54001624940881,"sku":"58957","price":2490.0,"currency_code":"EUR","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0729\/8741\/0769\/files\/IGSAudioVolf.jpg?v=1781115395"},{"product_id":"igs-audio-one-la-500","title":"IGS Audio ONE LA 500","description":"\u003cdiv lang=\"en\"\u003e\n  \u003cp\u003e\u003cstrong\u003eIGS Audio ONE LA 500\u003c\/strong\u003e is a tube optical compressor in 500 Series format — the only unit in this format built around a full-size T4B photocell operating at 250 V DC, generated by an onboard step-up converter. Double-wide (2 slots), mono. The audio path follows the Teletronix '68 LA-2A circuit: JJ 12AX7 on the input, JJ 12AU7 on the output, Sowter input transformer, Edcor output transformer, and an OEP transformer in the sidechain circuit. Components are 1% metal film resistors and Wima capacitors, individually calibrated per unit. Two controls — Peak Reduction and Gain — and a Compress\/Limit switch form the complete interface.\u003c\/p\u003e\n\n  \u003ch3\u003e250 V DC in a 500 Slot — Full Tube Performance Without Compromise\u003c\/h3\u003e\n  \u003cp\u003eA standard 500 Series slot delivers ±16 V, which is adequate for transistors and ICs but wholly insufficient for triodes, which produce their characteristic sound at plate voltages of 200–300 V. Starved tubes at low plate voltage don't operate in their linear range and instead produce hard, unpleasant distortion rather than the smooth, creamy character of an LA-2A. IGS Audio solves this with an onboard boost converter that draws from two adjacent slots (combined 250 mA draw) and generates 250 V DC — the 12AX7 and 12AU7 tubes operate under conditions identical to full-size rackmount hardware. The result is optical compression with the natural program-dependent release curve of the T4B photocell, triode creaminess, and the transformer warmth of Sowter and Edcor — all in a double-wide 500 format body.\u003c\/p\u003e\n\n  \u003ch3\u003eT4B Photocell and Three Transformers — Signal Path Architecture\u003c\/h3\u003e\n  \u003cp\u003eThe ONE LA 500 is the only optical compressor in 500 format built around a full-size T4B photocell — not a miniaturized T4Bx substitute, but the same element used in full-size LA-2A units. Three transformers across the path: Sowter on the audio input, Edcor on the audio output, and OEP in the sidechain control circuit — transformer coloration at every stage of the chain. The VU meter is calibrated from the front panel. Power draw of up to 250 mA total from a standard 500-series chassis with no requirement for a specialized power supply beyond two available slots.\u003c\/p\u003e\n\n  \u003ch3\u003eKEY FEATURES\u003c\/h3\u003e\n  \u003cul\u003e\n    \u003cli\u003eTube optical compressor in API 500 Series format, double-wide (2 slots), mono\u003c\/li\u003e\n    \u003cli\u003eFirst high-voltage tube 500 Series module from IGS Audio\u003c\/li\u003e\n    \u003cli\u003ePlate voltage: 250 V DC (onboard step-up converter from 2 slots)\u003c\/li\u003e\n    \u003cli\u003eAudio path: Teletronix '68 LA-2A circuit topology\u003c\/li\u003e\n    \u003cli\u003eTubes: JJ 12AX7 (audio input), JJ 12AU7 (audio output)\u003c\/li\u003e\n    \u003cli\u003ePhotocell: full-size T4B (field-replaceable on special order)\u003c\/li\u003e\n    \u003cli\u003eTransformers: Sowter (audio input), Edcor (audio output), OEP (sidechain)\u003c\/li\u003e\n    \u003cli\u003eCompress and Limit modes (switchable)\u003c\/li\u003e\n    \u003cli\u003eControls: Peak Reduction (continuous, 41-position), Gain (continuous, 41-position)\u003c\/li\u003e\n    \u003cli\u003eMax gain: 36 dB; max gain reduction: 36 dB\u003c\/li\u003e\n    \u003cli\u003eHardwire bypass\u003c\/li\u003e\n    \u003cli\u003eVU meter calibrated from front panel\u003c\/li\u003e\n    \u003cli\u003eInput impedance: 10 kΩ (balanced)\u003c\/li\u003e\n    \u003cli\u003eMax output: +21 dBu; dynamic range: 100 dB; noise: –99 dB(A)\u003c\/li\u003e\n    \u003cli\u003eFrequency response: 20 Hz – 20 kHz, ±0.1 dB\u003c\/li\u003e\n    \u003cli\u003ePower draw: max 250 mA total (from 2 standard 500-series slots)\u003c\/li\u003e\n    \u003cli\u003e1% metal film resistors, Wima capacitors throughout\u003c\/li\u003e\n    \u003cli\u003eHandmade in Poland\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003ch3\u003eTECHNICAL SPECIFICATIONS\u003c\/h3\u003e\n  \u003cul\u003e\n    \u003cli\u003eFormat: API 500 Series, double-wide (2 slots), mono\u003c\/li\u003e\n    \u003cli\u003eType: tube optical compressor\u003c\/li\u003e\n    \u003cli\u003ePlate voltage: 250 V DC (onboard converter)\u003c\/li\u003e\n    \u003cli\u003eTubes: JJ 12AX7 (input), JJ 12AU7 (output)\u003c\/li\u003e\n    \u003cli\u003ePhotocell: T4B (full-size)\u003c\/li\u003e\n    \u003cli\u003eTransformers: Sowter (audio input), Edcor (audio output), OEP (sidechain)\u003c\/li\u003e\n    \u003cli\u003eInput impedance: 10 kΩ (balanced)\u003c\/li\u003e\n    \u003cli\u003eOperating level: +4 dBu\u003c\/li\u003e\n    \u003cli\u003eMax input level: +20 dBu\u003c\/li\u003e\n    \u003cli\u003eMax output level: +21 dBu\u003c\/li\u003e\n    \u003cli\u003eDynamic range: 100 dB\u003c\/li\u003e\n    \u003cli\u003eNoise level: –99 dB(A)\u003c\/li\u003e\n    \u003cli\u003eMax gain: 36 dB\u003c\/li\u003e\n    \u003cli\u003eMax gain reduction: 36 dB\u003c\/li\u003e\n    \u003cli\u003eFrequency response: 20 Hz – 20 kHz, ±0.1 dB\u003c\/li\u003e\n    \u003cli\u003ePower consumption: max 250 mA total (2 slots)\u003c\/li\u003e\n    \u003cli\u003eMade in: Poland\u003c\/li\u003e\n  \u003c\/ul\u003e\n\u003c\/div\u003e","brand":"IGS Audio","offers":[{"title":"Default Title","offer_id":54001625203025,"sku":"47376","price":925.0,"currency_code":"EUR","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0729\/8741\/0769\/files\/IGSAudioONELA500.jpg?v=1781115385"},{"product_id":"igs-audio-tubecore","title":"IGS Audio TUBECORE","description":"\u003cdiv lang=\"en\"\u003e\n  \u003cp\u003e\u003cstrong\u003eIGS Audio Tubecore\u003c\/strong\u003e is a dual-channel stereo vari-mu compressor in a 3U chassis — designed from the ground up as a studio mastering compressor. The signal path is fully symmetric from input to output, with Carnhill and Sowter transformers, 1% metal film resistors, Wima capacitors, and NOS 6N1P-EW tubes individually calibrated per unit. The 3U enclosure provides panel clarity and rear access to the tube slots; all controls run on 24-position Elma switches. Operating modes include Dual Mono and Mid\/Side, with a sidechain HPF, Wet\/Dry Mixer, and two independent bypass switches per channel for A\/B comparison.\u003c\/p\u003e\n\n  \u003ch3\u003eVari-Mu and Swappable Tubes — Four Compression Characters\u003c\/h3\u003e\n  \u003cp\u003eVari-mu compression works by varying the operating point of the triode via the sidechain voltage — the higher the input level, the more the tube is driven into cutoff, the greater the gain reduction. No hard threshold, no stepped knee: vari-mu compresses smoothly, musically, and with harmonically rich distortion that listeners describe as dense, alive, and cohesive. The Tubecore accepts four tube families in the gain-control stage: 6N1P-EW NOS (standard IGS set — \"standard IGS compression\"), 6BC8\/6BZ8 (\"tight, transparent, punchy\"), 6386 (\"legendary compression, famous twin triode\"), and 5670 (\"deep and dark tube compression\"). Each choice physically changes attack character, release behavior, and harmonic profile without any circuit modification — tube swapping is a user procedure described in the manual, performed via the rear panel.\u003c\/p\u003e\n\n  \u003ch3\u003eM\/S, Sidechain HPF, Wet\/Dry and Gain Staging\u003c\/h3\u003e\n  \u003cp\u003eMid\/Side mode via OpAmp encoder\/decoder enables independent compression of the center and side channels — a precise mastering tool for managing stereo width without disturbing the overall tonal balance. The sidechain HPF (60 Hz \/ 120 Hz \/ Off) decouples low-frequency content from the compression control circuit, eliminating pumping on material with prominent kick drum or bass. The Wet\/Dry control implements parallel compression inline without external routing. Per-channel gain staging: Input (1–24 dB) → Threshold (0 to –12 dB reduction) → Output (1–24 dB) → Wet\/Dry — all controls stepped. Two hardwire bypass positions per channel allow instant A\/B comparison without touching the settings. Maximum gain reduction is 20 dB, dynamic range above 107 dB(A).\u003c\/p\u003e\n\n  \u003ch3\u003eKEY FEATURES\u003c\/h3\u003e\n  \u003cul\u003e\n    \u003cli\u003eDual-channel stereo vari-mu compressor, 3U 19\" format\u003c\/li\u003e\n    \u003cli\u003eFully symmetric signal path from input to output\u003c\/li\u003e\n    \u003cli\u003eTransformers: Carnhill and Sowter (input and output)\u003c\/li\u003e\n    \u003cli\u003eNOS 6N1P-EW tubes (standard); optional 6BC8\/6BZ8, 6386, 5670 — user-replaceable\u003c\/li\u003e\n    \u003cli\u003e1% metal film resistors, Wima capacitors; components matched per unit\u003c\/li\u003e\n    \u003cli\u003eInput Gain: 1–24 dB (stepped, 24-position Elma)\u003c\/li\u003e\n    \u003cli\u003eOutput Gain: 1–24 dB (stepped, 24-position Elma)\u003c\/li\u003e\n    \u003cli\u003eThreshold: 0 to –12 dB reduction\u003c\/li\u003e\n    \u003cli\u003eAttack: 0.1 \/ 0.3 \/ 1 \/ 3 \/ 10 \/ 30 ms (stepped)\u003c\/li\u003e\n    \u003cli\u003eRelease: 0.1 \/ 0.4 \/ 0.6 \/ 0.8 \/ 1.6 s \/ Auto (stepped)\u003c\/li\u003e\n    \u003cli\u003eMax gain reduction: 20 dB\u003c\/li\u003e\n    \u003cli\u003eSidechain HPF: 60 Hz \/ 120 Hz \/ Off\u003c\/li\u003e\n    \u003cli\u003eWet\/Dry Mixer: 0–100%, 4 dB steps\u003c\/li\u003e\n    \u003cli\u003eDual Mono or Mid\/Side mode (OpAmp encoder\/decoder)\u003c\/li\u003e\n    \u003cli\u003eTwo hardwire bypass positions per channel (fast A\/B)\u003c\/li\u003e\n    \u003cli\u003eInput impedance: 2500 Ω; output impedance: 600 Ω (balanced XLR)\u003c\/li\u003e\n    \u003cli\u003eMax input\/output: +22 dBu; dynamic range: \u0026gt;107 dB(A)\u003c\/li\u003e\n    \u003cli\u003eVU metering: fast analog VU per channel\u003c\/li\u003e\n    \u003cli\u003eInternal power supply; handmade in Poland\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003ch3\u003eTECHNICAL SPECIFICATIONS\u003c\/h3\u003e\n  \u003cul\u003e\n    \u003cli\u003eType: dual-channel stereo vari-mu compressor, 3U 19\"\u003c\/li\u003e\n    \u003cli\u003eInput impedance: 2500 Ω (transformer, balanced XLR)\u003c\/li\u003e\n    \u003cli\u003eOutput impedance: 600 Ω (transformer, balanced XLR)\u003c\/li\u003e\n    \u003cli\u003eOperating level: +4 dBu\u003c\/li\u003e\n    \u003cli\u003eMax input level: +22 dBu\u003c\/li\u003e\n    \u003cli\u003eMax output level: +22 dBu\u003c\/li\u003e\n    \u003cli\u003eDynamic range: \u0026gt;107 dB(A)\u003c\/li\u003e\n    \u003cli\u003eMax gain reduction: 20 dB\u003c\/li\u003e\n    \u003cli\u003eAttack: 0.1 \/ 0.3 \/ 1 \/ 3 \/ 10 \/ 30 ms\u003c\/li\u003e\n    \u003cli\u003eRelease: 0.1 \/ 0.4 \/ 0.6 \/ 0.8 \/ 1.6 s \/ Auto\u003c\/li\u003e\n    \u003cli\u003eFrequency response: 20 Hz – 20 kHz, ±0.2 dB\u003c\/li\u003e\n    \u003cli\u003eTubes: 6N1P-EW NOS (standard); optional 6BC8\/6BZ8, 6386, 5670\u003c\/li\u003e\n    \u003cli\u003eTransformers: Carnhill + Sowter\u003c\/li\u003e\n    \u003cli\u003eSidechain HPF: 60 Hz \/ 120 Hz \/ Off\u003c\/li\u003e\n    \u003cli\u003eWet\/Dry: 0–100%, 4 dB steps\u003c\/li\u003e\n    \u003cli\u003eM\/S Processing: OpAmp encoder\/decoder\u003c\/li\u003e\n    \u003cli\u003eBypass: hardwire, 2 positions per channel\u003c\/li\u003e\n    \u003cli\u003eAll controls: 24-position Elma switches\u003c\/li\u003e\n    \u003cli\u003eMade in: Poland\u003c\/li\u003e\n  \u003c\/ul\u003e\n\u003c\/div\u003e","brand":"IGS Audio","offers":[{"title":"Default Title","offer_id":54001626743121,"sku":"28179","price":2990.0,"currency_code":"EUR","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0729\/8741\/0769\/files\/IGSAudioTUBECORE.jpg?v=1781115377"},{"product_id":"igs-audio-one-leveling-amplifier","title":"IGS Audio One Leveling Amplifier","description":"\u003cdiv lang=\"en\"\u003e\n  \u003cp\u003e\u003cstrong\u003eIGS Audio One Leveling Amplifier\u003c\/strong\u003e is a mono tube optical compressor inspired by the Teletronix LA-2A — a fully tube signal path with transformer-balanced input and output and a T4Bx photocell as the gain reduction element. Input transformer is IGS Audio 2510, output transformer IGS 15k\/600; two 6N1P-EW dual triodes in the audio circuit and a 6N2P-EW + 6AQ5 pair in the photocell control circuit. Maximum gain reduction of 36 dB, dynamic range above 110 dB(A), 40 W internal power supply. Stereo Link via rear RCA connector.\u003c\/p\u003e\n\n  \u003ch3\u003eT4Bx Photocell and Tube Topology — LA-2A Character in a New Design\u003c\/h3\u003e\n  \u003cp\u003eThe LA-2A is defined by optical compression: an electroluminescent panel drives a photoresistor, which attenuates the signal proportionally to its illumination. Attack and release timing derive from the photocell's physics rather than potentiometer settings — attack at 1 ms, release from 0.5 to 5 s with the 50% point at 60 ms. This means the compressor breathes with the material: fast attack catches transients, but the long release tail ensures the return to unity is always gradual. IGS Audio uses its own T4Bx photocell as a modern equivalent of the T4B, hand-matched for unit-to-unit consistency. Compress mode produces a soft knee and musical compression — the standard setting for vocals, acoustic guitar, and brass; Limit mode sharpens the knee and responds more aggressively to transients. Three controls complete the interface: Peak Reduction (threshold and depth of gain reduction), Gain (makeup gain to 30 dB), and the Compress\/Limit switch. The VU meter toggles between output level and gain reduction display.\u003c\/p\u003e\n\n  \u003ch3\u003eFull Tube Circuit and Transformer Color\u003c\/h3\u003e\n  \u003cp\u003eFour tubes across the signal path and control circuit mean that every stage — amplification, sidechain, photocell drive — contributes tube harmonics to the output signal. THD+N of 85 dB(A) is typical for a studio-grade tube optical compressor: higher distortion than a transistor design, but harmonically musical and part of the character. The IGS Audio 2510 input transformer and 15k\/600 output transformer add transformer coloration — midrange density and warmth that complements the photocell's organic response. Two One LA units linked via the rear RCA Stereo Link connector operate as a stereo pair with independent per-channel adjustment.\u003c\/p\u003e\n\n  \u003ch3\u003eKEY FEATURES\u003c\/h3\u003e\n  \u003cul\u003e\n    \u003cli\u003eMono tube optical compressor — inspired by the Teletronix LA-2A\u003c\/li\u003e\n    \u003cli\u003eT4Bx photocell (IGS Audio Custom, equivalent of T4B) — hand-matched per unit\u003c\/li\u003e\n    \u003cli\u003eFull tube circuit: 2 × 6N1P-EW (audio) + 6N2P-EW + 6AQ5 (sidechain control)\u003c\/li\u003e\n    \u003cli\u003eTransformers: IGS Audio 2510 (input) + IGS 15k\/600 (output)\u003c\/li\u003e\n    \u003cli\u003eCompress and Limit modes (switchable)\u003c\/li\u003e\n    \u003cli\u003eControls: Peak Reduction, Gain, Compress\/Limit switch\u003c\/li\u003e\n    \u003cli\u003eMax gain: 30 dB; max gain reduction: 36 dB\u003c\/li\u003e\n    \u003cli\u003eAttack: 1 ms; release: 0.5–5 s (50% at 60 ms)\u003c\/li\u003e\n    \u003cli\u003eInput and output impedance: 600 Ω (balanced)\u003c\/li\u003e\n    \u003cli\u003eMax input: +16 dBu; max output: +18 dBu\u003c\/li\u003e\n    \u003cli\u003eDynamic range: \u0026gt;110 dB(A) at 1 kHz, +24 dBu\u003c\/li\u003e\n    \u003cli\u003eVU meter: output level or gain reduction (switchable)\u003c\/li\u003e\n    \u003cli\u003eStereo Link: RCA connector (rear panel)\u003c\/li\u003e\n    \u003cli\u003eInternal power supply, 115\/230 V AC, 40 W\u003c\/li\u003e\n    \u003cli\u003eChannel configuration: mono (stereo pair via Stereo Link)\u003c\/li\u003e\n    \u003cli\u003eMade in: Poland\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003ch3\u003eTECHNICAL SPECIFICATIONS\u003c\/h3\u003e\n  \u003cul\u003e\n    \u003cli\u003eType: mono tube optical compressor\/leveling amplifier\u003c\/li\u003e\n    \u003cli\u003eCompression element: T4Bx photocell (IGS Audio Custom)\u003c\/li\u003e\n    \u003cli\u003eTubes: 2 × 6N1P-EW (audio), 1 × 6N2P-EW (sidechain), 1 × 6AQ5 (sidechain)\u003c\/li\u003e\n    \u003cli\u003eInput transformer: IGS Audio 2510\u003c\/li\u003e\n    \u003cli\u003eOutput transformer: IGS 15k\/600\u003c\/li\u003e\n    \u003cli\u003eInput impedance: 600 Ω (balanced)\u003c\/li\u003e\n    \u003cli\u003eOutput impedance: 600 Ω (balanced)\u003c\/li\u003e\n    \u003cli\u003eOperating level: +4 dBu\u003c\/li\u003e\n    \u003cli\u003eMax input level: +16 dBu\u003c\/li\u003e\n    \u003cli\u003eMax output level: +18 dBu\u003c\/li\u003e\n    \u003cli\u003eDynamic range: \u0026gt;110 dB(A) at 1 kHz, +24 dBu\u003c\/li\u003e\n    \u003cli\u003eMax gain: 30 dB\u003c\/li\u003e\n    \u003cli\u003eMax gain reduction: 36 dB\u003c\/li\u003e\n    \u003cli\u003eAttack: 1 ms\u003c\/li\u003e\n    \u003cli\u003eRelease: 0.5–5 s (50% at 60 ms)\u003c\/li\u003e\n    \u003cli\u003eTHD+N: 85 dB(A)\u003c\/li\u003e\n    \u003cli\u003eStereo Link: RCA (rear panel)\u003c\/li\u003e\n    \u003cli\u003ePower: internal, 115\/230 V AC, 40 W\u003c\/li\u003e\n    \u003cli\u003eMade in: Poland\u003c\/li\u003e\n  \u003c\/ul\u003e\n\u003c\/div\u003e","brand":"IGS Audio","offers":[{"title":"Default Title","offer_id":54001626808657,"sku":"47369","price":1590.0,"currency_code":"EUR","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0729\/8741\/0769\/files\/IGSAudioOneLevelingAmplifier.jpg?v=1781115368"},{"product_id":"igs-audio-multicore","title":"IGS Audio MULTICORE","description":"\u003cdiv lang=\"en\"\u003e\n  \u003cp\u003e\u003cstrong\u003eIGS Audio Multicore\u003c\/strong\u003e is a three-band analog VCA compressor with an adjustable active crossover at 6 dB\/oct slope — designed as a stereo dynamics processor for mix bus and mastering applications. The signal path uses only THT (through-hole technology) components; passive elements are matched in pairs for optimal L\/R correlation; Carnhill VTB transformers on input (10 kΩ) and output (600 Ω). Dynamic range of 104 dB(A), THD+N of 0.08%, SNR of 90 dB(A) — mastering-grade parameters at 22 W power consumption.\u003c\/p\u003e\n\n  \u003ch3\u003e6 dB\/oct Crossover and Independent Per-Band Compression Without Phase Issues\u003c\/h3\u003e\n  \u003cp\u003eThe choice of 6 dB\/oct crossover slope is deliberate. Steeper slopes (18 or 24 dB\/oct) minimize band overlap but introduce phase shifts that are audible in the summed output. The gentle 6 dB\/oct slope preserves phase coherence at the cost of a wider transition band — meaning each band picks up some content from adjacent frequencies, and the compression effect is smoother and more musical across the crossover region. Each of the three bands (Low, Mid, High) has an independent set of controls: Threshold, Ratio (2:1\/4:1\/10:1), Attack (0.1\/0.3\/1\/18\/30 ms), Release (0.1\/0.4\/0.6\/0.8\/1.6 s or Auto), and Gain. A Mute\/ON\/Bypass switch per band allows silencing two bands to monitor the content and bandwidth of the third in isolation — essential when setting crossover frequencies on complex material. Maximum gain reduction is –20 dB per band at operating level +4 dBu with headroom to +28 dBu.\u003c\/p\u003e\n\n  \u003ch3\u003eApplications: Mix Bus, Mastering and Individual Tracks\u003c\/h3\u003e\n  \u003cp\u003eOn the mix bus, the Multicore controls dynamics per frequency range without inter-band influence — quiet midrange sources don't force low-band compression, and aggressive bass content doesn't pump the high end. On vocals, the High band compressor handles sibilance (4–10 kHz) without affecting the low and midrange dynamic — functionally similar to a de-esser, but with full control over the compression characteristics. On acoustic material (piano, strings, ensemble), per-band independent compression preserves the instrument's natural dynamic balance while evening out frequency extremes. Carnhill VTB transformers on both input and output contribute the subtle transformer coloration associated with Neve-class hardware.\u003c\/p\u003e\n\n  \u003ch3\u003eKEY FEATURES\u003c\/h3\u003e\n  \u003cul\u003e\n    \u003cli\u003eThree-band analog VCA compressor — Low, Mid, High\u003c\/li\u003e\n    \u003cli\u003eAdjustable active crossover, 6 dB\/oct slope — no phase problems at band summing\u003c\/li\u003e\n    \u003cli\u003eIndependent compressor per band: Threshold, Ratio, Attack, Release, Gain\u003c\/li\u003e\n    \u003cli\u003eRatio: 2:1, 4:1, 10:1 (switched per band)\u003c\/li\u003e\n    \u003cli\u003eAttack: 0.1 \/ 0.3 \/ 1 \/ 18 \/ 30 ms (switched per band)\u003c\/li\u003e\n    \u003cli\u003eRelease: 0.1 \/ 0.4 \/ 0.6 \/ 0.8 \/ 1.6 s \/ Auto (switched per band)\u003c\/li\u003e\n    \u003cli\u003eMute\/ON\/Bypass per band — isolation and monitoring of individual band\u003c\/li\u003e\n    \u003cli\u003eMax gain reduction: –20 dB per band\u003c\/li\u003e\n    \u003cli\u003eCarnhill VTB transformers on inputs and outputs\u003c\/li\u003e\n    \u003cli\u003eTHT signal path — through-hole components, passive elements matched in L\/R pairs\u003c\/li\u003e\n    \u003cli\u003eInput impedance: 10 kΩ (balanced)\u003c\/li\u003e\n    \u003cli\u003eOutput impedance: 600 Ω (balanced)\u003c\/li\u003e\n    \u003cli\u003eMax input and output level: +28 dBu\u003c\/li\u003e\n    \u003cli\u003eDynamic range: 104 dB(A)\u003c\/li\u003e\n    \u003cli\u003ePower: internal, 115\/230 V AC, 22 W\u003c\/li\u003e\n    \u003cli\u003eShipping weight: 10 kg; made in Poland\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003ch3\u003eTECHNICAL SPECIFICATIONS\u003c\/h3\u003e\n  \u003cul\u003e\n    \u003cli\u003eType: three-band stereo VCA compressor\u003c\/li\u003e\n    \u003cli\u003eCrossover: active, adjustable, 6 dB\/oct slope\u003c\/li\u003e\n    \u003cli\u003eInput impedance: 10 kΩ (Carnhill VTB transformer, balanced)\u003c\/li\u003e\n    \u003cli\u003eOutput impedance: 600 Ω (Carnhill VTB transformer, balanced)\u003c\/li\u003e\n    \u003cli\u003eOperating level: +4 dBu\u003c\/li\u003e\n    \u003cli\u003eMax input level: +28 dBu\u003c\/li\u003e\n    \u003cli\u003eMax output level: +28 dBu\u003c\/li\u003e\n    \u003cli\u003eDynamic range: 104 dB(A)\u003c\/li\u003e\n    \u003cli\u003eMax gain reduction: –20 dB\u003c\/li\u003e\n    \u003cli\u003eRatio: 2:1, 4:1, 10:1\u003c\/li\u003e\n    \u003cli\u003eAttack: 0.1 \/ 0.3 \/ 1 \/ 18 \/ 30 ms\u003c\/li\u003e\n    \u003cli\u003eRelease: 0.1 \/ 0.4 \/ 0.6 \/ 0.8 \/ 1.6 s \/ Auto\u003c\/li\u003e\n    \u003cli\u003eFrequency response: 10 Hz – 30 kHz, +0.3 dB \/ –0.3 dB\u003c\/li\u003e\n    \u003cli\u003eSNR: 90 dB(A)\u003c\/li\u003e\n    \u003cli\u003eTHD+N: 0.08%\u003c\/li\u003e\n    \u003cli\u003eIMD (SMPTE): 0.03%\u003c\/li\u003e\n    \u003cli\u003eCrosstalk: 88 dB\u003c\/li\u003e\n    \u003cli\u003ePower: internal, 115\/230 V AC, 22 W\u003c\/li\u003e\n    \u003cli\u003eShipping weight: 10 kg\u003c\/li\u003e\n    \u003cli\u003eMade in: Poland\u003c\/li\u003e\n  \u003c\/ul\u003e\n\u003c\/div\u003e","brand":"IGS Audio","offers":[{"title":"Default Title","offer_id":54001627300177,"sku":"28176","price":2990.0,"currency_code":"EUR","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0729\/8741\/0769\/files\/IGSAudioMULTICORE.jpg?v=1781115359"},{"product_id":"igs-audio-rubber-bands","title":"IGS Audio RUBBER BANDS","description":"\u003cdiv lang=\"en\"\u003e\n  \u003cp\u003e\u003cstrong\u003eIGS Audio Rubber Bands\u003c\/strong\u003e is a dual-channel stereo passive equalizer in the Pultec style, paired with a two-stage tube output amplifier called the Organic Amp — a Polish interpretation of the EQP-1 topology. The passive filter block delivers the characteristic interactions between simultaneous boost and cut at the same frequencies that define classic 1960s passive equalization. The Organic Amp, built around four 6N1P-EW tubes, recovers level lost across the passive network and contributes its own tube harmonic character. Components are hand-matched to 1% tolerance; input transformers are Carnhill, output transformers are Edcor; relay bypass per unit. Format is 2U with an external 34 W supply.\u003c\/p\u003e\n\n  \u003ch3\u003ePultec Topology — Simultaneous Boost and Cut\u003c\/h3\u003e\n  \u003cp\u003eThe defining feature of a passive EQP-1-style filter is the ability to simultaneously boost and cut the same LF frequency — the result is a response curve that adds density to the low end without muddying the midrange. Boosting and cutting 60 Hz at the same time does not produce a simple net result: the interaction of first-order filters generates a curve that no active shelving EQ can replicate. This is the same mechanism responsible for the Pultec's reputation on kick drum and electric bass. In the Rubber Bands, the Bass section (20\/30\/60\/100\/180\/240 Hz) handles both Boost and Cut continuously; the High Boost section (5\/6\/8\/10\/12\/16 kHz, Q 0.5–10) offers sweepable bandwidth alongside the frequency selector; and the High Cut (6\/10\/20 kHz) completes the EQP-1A control set. The 1% component tolerance ensures both stereo channels track identically — a level of matching impossible without manual selection.\u003c\/p\u003e\n\n  \u003ch3\u003eOrganic Amp — 6N1P Tubes and Active Stage Character\u003c\/h3\u003e\n  \u003cp\u003eThe Organic Amp is not a neutral buffer. Four 6N1P-EW tubes in a two-stage configuration contribute their own harmonic distortion (THD 0.25%, THD+N 0.33%), which at subtle EQ settings layers on top of the correction and adds density, warmth, and three-dimensionality. Optional replacement tubes — 6BC8 or 6BC7 — shift the harmonic balance of the Organic Amp stage without touching the passive filter, allowing personalization of the amplifier's color. Relay bypass enables instant A\/B comparison between the equalized and unprocessed signal with a single switch.\u003c\/p\u003e\n\n  \u003ch3\u003eKEY FEATURES\u003c\/h3\u003e\n  \u003cul\u003e\n    \u003cli\u003eDual-channel stereo passive Pultec-style EQ (EQP-1 topology) + Organic Amp tube stage\u003c\/li\u003e\n    \u003cli\u003ePassive filter: simultaneous LF Boost and Cut — classic Pultec filter interaction\u003c\/li\u003e\n    \u003cli\u003eBass Boost\/Cut: 20, 30, 60, 100, 180, 240 Hz (continuously variable, ±15 dB)\u003c\/li\u003e\n    \u003cli\u003eHigh Boost: 5, 6, 8, 10, 12, 16 kHz (Q 0.5–10, continuously variable)\u003c\/li\u003e\n    \u003cli\u003eHigh Cut: 6, 10, 20 kHz (continuously variable)\u003c\/li\u003e\n    \u003cli\u003eAll frequency selectors stepped switches\u003c\/li\u003e\n    \u003cli\u003eOrganic Amp: 4 × 6N1P-EW tubes (optional: 6BC8 or 6BC7)\u003c\/li\u003e\n    \u003cli\u003eComponent tolerance 1% — matched stereo channel tracking\u003c\/li\u003e\n    \u003cli\u003eTransformers: Carnhill input (10 kΩ) + Edcor output (600 Ω)\u003c\/li\u003e\n    \u003cli\u003eRelay hardwire bypass\u003c\/li\u003e\n    \u003cli\u003eInput impedance: 10 kΩ (balanced)\u003c\/li\u003e\n    \u003cli\u003eOutput impedance: 600 Ω (balanced)\u003c\/li\u003e\n    \u003cli\u003eMax input: +18 dBu; max output: +22 dBu\u003c\/li\u003e\n    \u003cli\u003eExternal PSU, 115\/230 V AC, 34 W\u003c\/li\u003e\n    \u003cli\u003eFormat: 2U, 19\"; packaging: 70 × 50 × 30 cm; shipping weight: approx. 5 kg\u003c\/li\u003e\n    \u003cli\u003eMade in: Poland\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003ch3\u003eTECHNICAL SPECIFICATIONS\u003c\/h3\u003e\n  \u003cul\u003e\n    \u003cli\u003eType: stereo passive Pultec-style EQ + Organic Amp tube stage\u003c\/li\u003e\n    \u003cli\u003eInput impedance: 10 kΩ, Carnhill transformer (balanced)\u003c\/li\u003e\n    \u003cli\u003eOutput impedance: 600 Ω, Edcor transformer (balanced)\u003c\/li\u003e\n    \u003cli\u003eOperating level: +4 dBu\u003c\/li\u003e\n    \u003cli\u003eMax input level: +18 dBu\u003c\/li\u003e\n    \u003cli\u003eMax output level: +22 dBu\u003c\/li\u003e\n    \u003cli\u003eDynamic range: 95 dB(A) at 1 kHz, +18 dBu\u003c\/li\u003e\n    \u003cli\u003eFrequency response: 20 Hz – 20 kHz, ±0.3 dB\u003c\/li\u003e\n    \u003cli\u003eSNR: 81 dB(A)\u003c\/li\u003e\n    \u003cli\u003eTHD: 0.25% (20 Hz – 20 kHz)\u003c\/li\u003e\n    \u003cli\u003eTHD+N: 0.33% (20 Hz – 20 kHz)\u003c\/li\u003e\n    \u003cli\u003eIMD (SMPTE): 0.32% (20 Hz – 20 kHz)\u003c\/li\u003e\n    \u003cli\u003eCrosstalk: 80 dB (20 Hz – 20 kHz)\u003c\/li\u003e\n    \u003cli\u003eQ range: 0.5–4 (continuously variable)\u003c\/li\u003e\n    \u003cli\u003eEQ range: ±15 dB\u003c\/li\u003e\n    \u003cli\u003eTubes: 4 × 6N1P-EW (optional: 6BC8 or 6BC7)\u003c\/li\u003e\n    \u003cli\u003ePower: external PSU, 115\/230 V AC, 50–60 Hz, 34 W\u003c\/li\u003e\n    \u003cli\u003eFormat: 2U, 19\", depth 230 mm\u003c\/li\u003e\n    \u003cli\u003eShipping weight: approx. 5 kg\u003c\/li\u003e\n    \u003cli\u003eMade in: Poland\u003c\/li\u003e\n  \u003c\/ul\u003e\n\u003c\/div\u003e","brand":"IGS Audio","offers":[{"title":"Default Title","offer_id":54001629823313,"sku":"28177","price":2150.0,"currency_code":"EUR","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0729\/8741\/0769\/files\/IGSAudioRUBBERBANDS1.jpg?v=1781115349"},{"product_id":"igs-audio-springtime","title":"IGS Audio SPRINGTIME","description":"\u003cdiv lang=\"en\"\u003e\n  \u003cp\u003e\u003cstrong\u003eIGS Audio Springtime\u003c\/strong\u003e is a four-channel analog spring reverb in a large chassis housing four full-size spring tanks — two pairs of short springs (channels 1–2) and two pairs of long springs (channels 3–4). Each channel is mono and fully independent: separate Wet and Dry controls on 24-position Elma switches, a three-band Baxandall equalizer on the wet signal path, and a hardwire bypass per channel. Input impedance of 10 kΩ, output impedance of 50 Ω, THD+N of 0.001% at 1 kHz, and 120 dB dynamic range place the Springtime firmly in professional studio territory rather than the novelty end of spring reverb.\u003c\/p\u003e\n\n  \u003ch3\u003eShort and Long Springs — Two Reverb Characters in One Unit\u003c\/h3\u003e\n  \u003cp\u003eThe short springs (channels 1–2) produce dense, tight reverb with clear attack definition — suited for solo vocals, acoustic instruments, and individual tracks where decay time needs to stay controlled and the midrange must remain articulate. The long springs (channels 3–4) deliver an open, expansive space with the characteristic upper-frequency shimmer and organic low-end weight of a long spring tank. Used as a stereo send on the mix bus (L to channel 3, R to channel 4) the Springtime adds cohesion and depth in a way that digital spring emulations — however accurate — cannot physically replicate: the actual mass and inertia of a spring element responds to transients differently from any algorithm. Individual instruments can be sent to both spring types simultaneously in a parallel configuration for a richer, layered ambience.\u003c\/p\u003e\n\n  \u003ch3\u003ePer-Channel Baxandall EQ and Console Routing\u003c\/h3\u003e\n  \u003cp\u003eThe three-band Baxandall EQ in the wet signal path operates independently from the dry path — reverb character is shaped without touching the direct signal. The ±15 dB range per band covers both subtle tank character adjustment and aggressive shaping: a HF boost of +12 dB produces bright, crackling guitar-amp reverb; cutting the mid pushes the reverb deeper into the mix without reducing its level. The EQ bypass per channel allows instant A\/B comparison of the spring's natural character against the corrected version. Insert use: 100% Dry, 10–30% Wet. Aux send use: 100% Wet, 0% Dry. The VU meter monitors the reverb output level.\u003c\/p\u003e\n\n  \u003ch3\u003eKEY FEATURES\u003c\/h3\u003e\n  \u003cul\u003e\n    \u003cli\u003e4-channel fully analog spring reverb — 4 independent full-size spring tanks\u003c\/li\u003e\n    \u003cli\u003eChannels 1–2: short springs (dense, tight reverb — vocals, solo instruments)\u003c\/li\u003e\n    \u003cli\u003eChannels 3–4: long springs (open, expansive space — stereo send, mix bus, ensemble)\u003c\/li\u003e\n    \u003cli\u003e3-band Baxandall EQ per channel on wet signal path, ±15 dB\u003c\/li\u003e\n    \u003cli\u003eSeparate Wet and Dry controls per channel — 24-position Elma switches\u003c\/li\u003e\n    \u003cli\u003eHardwire bypass per channel + EQ bypass per channel\u003c\/li\u003e\n    \u003cli\u003eInput impedance: 10 kΩ (balanced XLR)\u003c\/li\u003e\n    \u003cli\u003eOutput impedance: 50 Ω (balanced XLR)\u003c\/li\u003e\n    \u003cli\u003eOperating level: +22 dBu\u003c\/li\u003e\n    \u003cli\u003eHeadroom (at +4 dBu): 18 dB\u003c\/li\u003e\n    \u003cli\u003eDynamic range: 120 dB\u003c\/li\u003e\n    \u003cli\u003eTHD+N: 0.001% at 1 kHz, +4 dBu\u003c\/li\u003e\n    \u003cli\u003eVU meter: reverb output level\u003c\/li\u003e\n    \u003cli\u003ePower: 90–240 V AC, 10 W\u003c\/li\u003e\n    \u003cli\u003eShipping weight: 10 kg; packaging dimensions: 480 × 480 × 133 mm\u003c\/li\u003e\n    \u003cli\u003eMade in: Poland\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003ch3\u003eTECHNICAL SPECIFICATIONS\u003c\/h3\u003e\n  \u003cul\u003e\n    \u003cli\u003eType: four-channel analog spring reverb\u003c\/li\u003e\n    \u003cli\u003eChannels: 4 mono (2 × short springs + 2 × long springs)\u003c\/li\u003e\n    \u003cli\u003eInput impedance: 10 kΩ (balanced)\u003c\/li\u003e\n    \u003cli\u003eOutput impedance: 50 Ω (balanced)\u003c\/li\u003e\n    \u003cli\u003eOperating level: +22 dBu\u003c\/li\u003e\n    \u003cli\u003eHeadroom (at +4 dBu): 18 dB\u003c\/li\u003e\n    \u003cli\u003eDynamic range: 120 dB\u003c\/li\u003e\n    \u003cli\u003eTHD+N: 0.001% at 1 kHz, +4 dBu\u003c\/li\u003e\n    \u003cli\u003eFrequency response: 20 Hz – 20 kHz, ±0.1 dB\u003c\/li\u003e\n    \u003cli\u003eEQ: 3-band Baxandall per channel, ±15 dB\u003c\/li\u003e\n    \u003cli\u003eWet\/Dry: 24-position Elma switches\u003c\/li\u003e\n    \u003cli\u003eBypass: hardwire, per channel\u003c\/li\u003e\n    \u003cli\u003eMetering: VU reverb output level\u003c\/li\u003e\n    \u003cli\u003ePower: 90–240 V AC, 10 W\u003c\/li\u003e\n    \u003cli\u003ePackaging dimensions: 480 × 480 × 133 mm\u003c\/li\u003e\n    \u003cli\u003eShipping weight: 10 kg\u003c\/li\u003e\n    \u003cli\u003eMade in: Poland\u003c\/li\u003e\n  \u003c\/ul\u003e\n\u003c\/div\u003e","brand":"IGS Audio","offers":[{"title":"Default Title","offer_id":54001630118225,"sku":"28178","price":3350.0,"currency_code":"EUR","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0729\/8741\/0769\/files\/IGSAudioSPRINGTIME.jpg?v=1781115338"},{"product_id":"igs-audio-zen","title":"IGS Audio ZEN","description":"\u003cdiv lang=\"en\"\u003e\n  \u003cp\u003e\u003cstrong\u003eIGS Audio ZEN\u003c\/strong\u003e is a dual-channel stereo Zener diode compressor designed by Igor Sobczyk — a Polish interpretation of the diode-based compression circuit used in Abbey Road Studios during the Beatles era. The signal path runs through 14 bipolar transistors per channel and 8 hand-matched Zener diodes controlled by a perfect feedback loop. Custom IGS transformers on input (10 kΩ) and output (75 Ω), combined with an internal linear power supply, complete the design in a 2U chassis with fully stepped controls on Elma switches.\u003c\/p\u003e\n\n  \u003ch3\u003eZener Compression — Variable Ratio and Limiter Mode\u003c\/h3\u003e\n  \u003cp\u003eZener diodes don't behave like VCA or optical elements — the breakdown threshold is physically fixed, so ratio changes automatically with input level and Input Gain setting. Light drive produces soft, musical compression; deeper Input Gain increases gain reduction and sharpens the knee. This means Input Gain is simultaneously a ratio control, exactly as in the original EMI designs. Switching to Limit mode sharpens the knee further and increases transient control, moving the response toward hard limiting while retaining the Zener tonal character. Attack range of 8–100 ms with a ×4 multiplier covers up to 400 ms; release of 10–2000 ms with ×4 reaches up to 8 seconds. That spans from fast transient control to extremely slow, invisible level riding. The sidechain HPF (60\/90\/120\/240 Hz) separates low-frequency content from compression control, preventing pumping on bass-heavy material.\u003c\/p\u003e\n\n  \u003ch3\u003eAMP Mode, Wet\/Dry and M\/S Processing\u003c\/h3\u003e\n  \u003cp\u003eSetting the sidechain to AMP at minimum input passes signal through the amplifier and compression circuit without triggering actual gain reduction — the result is THD saturation adding transformer harmonics without any dynamic effect. A direct way to add density and color to a bus or track with zero compression. The OpAmp M\/S encoder\/decoder enables independent compression of Mid and Side channels — a precise mastering tool for controlling center density and stereo width separately. The Wet\/Dry control (0–100% in 4 dB steps) implements parallel compression without an external mixer. Hard-wire bypass per channel removes the circuit from the signal path entirely when disengaged. VU meters display gain reduction independently for L and R.\u003c\/p\u003e\n\n  \u003ch3\u003eKEY FEATURES\u003c\/h3\u003e\n  \u003cul\u003e\n    \u003cli\u003eDual-channel Zener diode compressor — 14 bipolar transistors per channel, 8 hand-matched Zener diodes\u003c\/li\u003e\n    \u003cli\u003eFeedback Zener compression — variable ratio dependent on Input Gain setting\u003c\/li\u003e\n    \u003cli\u003eComp and Limit modes (switchable)\u003c\/li\u003e\n    \u003cli\u003eAMP mode: THD saturation without compression\u003c\/li\u003e\n    \u003cli\u003eInput Gain: 1–24 dB (stepped, Elma switch)\u003c\/li\u003e\n    \u003cli\u003eOutput Gain: 1–24 dB (stepped, Elma switch)\u003c\/li\u003e\n    \u003cli\u003eAttack: 8–100 ms, ×4 multiplier (up to 400 ms)\u003c\/li\u003e\n    \u003cli\u003eRelease: 10–2000 ms, ×4 multiplier (up to 8 s)\u003c\/li\u003e\n    \u003cli\u003eSidechain HPF: 60 \/ 90 \/ 120 \/ 240 Hz (switchable)\u003c\/li\u003e\n    \u003cli\u003eStereo Link: yes\u003c\/li\u003e\n    \u003cli\u003eM\/S Processing: OpAmp encoder\/decoder\u003c\/li\u003e\n    \u003cli\u003eWet\/Dry Mixer: 0–100%, 4 dB steps\u003c\/li\u003e\n    \u003cli\u003eHard-wire bypass: yes (per channel)\u003c\/li\u003e\n    \u003cli\u003eAll controls stepped — 24-position Elma switches\u003c\/li\u003e\n    \u003cli\u003eCustom IGS transformers on inputs and outputs\u003c\/li\u003e\n    \u003cli\u003eVU meters: gain reduction L\/R\u003c\/li\u003e\n    \u003cli\u003eInternal linear power supply, 115\/230 V AC selectable\u003c\/li\u003e\n    \u003cli\u003eFormat: 2U rack; made in Poland\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003ch3\u003eTECHNICAL SPECIFICATIONS\u003c\/h3\u003e\n  \u003cul\u003e\n    \u003cli\u003eType: stereo Zener diode compressor, feedback topology, 2U rack\u003c\/li\u003e\n    \u003cli\u003eInput impedance: 10 kΩ (balanced XLR, IGS Custom transformer)\u003c\/li\u003e\n    \u003cli\u003eOutput impedance: 75 Ω (balanced XLR, IGS Custom transformer)\u003c\/li\u003e\n    \u003cli\u003eOperating level: +4 dBu\u003c\/li\u003e\n    \u003cli\u003eMax input level: +22 dBu\u003c\/li\u003e\n    \u003cli\u003eMax output level: +26 dBu\u003c\/li\u003e\n    \u003cli\u003eDynamic range: \u0026gt;100 dB\u003c\/li\u003e\n    \u003cli\u003eNoise level: –99 dBu\u003c\/li\u003e\n    \u003cli\u003eSNR: \u0026gt;90 dB\u003c\/li\u003e\n    \u003cli\u003eTHD+N: \u0026gt;86 dB\u003c\/li\u003e\n    \u003cli\u003eIMD (SMPTE): \u0026gt;90 dB\u003c\/li\u003e\n    \u003cli\u003eCrosstalk: 80 dB at 1 kHz\u003c\/li\u003e\n    \u003cli\u003eMax gain: 36 dB\u003c\/li\u003e\n    \u003cli\u003eMax gain reduction: –35 dB\u003c\/li\u003e\n    \u003cli\u003eAttack: 8–100 ms (×4 = 32–400 ms)\u003c\/li\u003e\n    \u003cli\u003eRelease: 10–2000 ms (×4 = 40–8000 ms)\u003c\/li\u003e\n    \u003cli\u003eFrequency response: 20 Hz – 20 kHz, ±0.1 dB\u003c\/li\u003e\n    \u003cli\u003ePower: internal linear PSU, 115\/230 V AC, \u0026lt;30 W consumption\u003c\/li\u003e\n    \u003cli\u003eShipping weight: approx. 9 kg\u003c\/li\u003e\n    \u003cli\u003eMade in: Poland\u003c\/li\u003e\n  \u003c\/ul\u003e\n\u003c\/div\u003e","brand":"IGS Audio","offers":[{"title":"Default Title","offer_id":54001630150993,"sku":"47366","price":2720.0,"currency_code":"EUR","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0729\/8741\/0769\/files\/IGSAudioZEN1.jpg?v=1781115327"},{"product_id":"igs-audio-v8-compressor","title":"IGS Audio V8 Compressor","description":"\u003cdiv lang=\"en\"\u003e\n\u003cstrong\u003eIGS Audio V8 Compressor\u003c\/strong\u003e\n\n\u003cp\u003eThe V8 is a dual-mono diode-bridge compressor built by IGS Audio using exclusively discrete components and six IGS Custom transformers (three per channel: input, interstage, and output). The compression element is a bridge of four pulse diodes matched by hand according to carefully developed procedures – a topology derived from the classic Neve\/EMI 2254 circuit. There are no integrated circuits anywhere in the signal path. The name V8 comes from IGS Audio's internal project numbering: this is the eighth compressor designed by the company. All controls are ELMA switches throughout, providing full session recall and precise matching between the two channels. Three-year manufacturer warranty.\u003c\/p\u003e\n\n\u003ch3\u003eDiode bridge as the compression element – what distinguishes this topology\u003c\/h3\u003e\n\u003cp\u003eVCA compressors control gain through an integrated circuit VCA driven by a side-chain voltage. FET designs compress by varying the impedance of a field-effect transistor. A diode bridge introduces compression through four diodes in a bridge configuration: at low signal levels the diodes operate linearly; at higher levels their characteristic curve begins limiting amplitude. The compression results from the physics of the p-n junction at higher signal voltages. The dynamic character is similar to FET compression – fast and aggressive – with the harmonic colour of an all-discrete transformer path: warmer and more musical than clean VCA electronics. Hand-matching of the four diodes by IGS Audio's procedures minimises channel-to-channel deviation and ensures a coherent stereo image when running the two channels as a linked pair. Dynamic range: 101 dBA at +24 dBu.\u003c\/p\u003e\n\n\u003ch3\u003eSide-chain HPF, +10THR switch and stereo link\u003c\/h3\u003e\n\u003cp\u003eA seven-position side-chain highpass filter (OFF, 40, 80, 120, 180, 240, 320 Hz) excludes low-frequency content from the detection circuit: kick drum and bass pass through without triggering compression, the mix breathes without pumping. The +10THR switch lowers the compression threshold by an additional 10 dB – useful for compressing very low-level signals or achieving very deep gain reduction without pushing the Threshold control to extreme positions. Stereo link couples the side-chain circuits of both channels, running them as a stereo pair with one shared detection centre. Attack time: 0.1–30 ms. Release: 0.1–1.4 s plus Auto. Maximum gain reduction: 30 dB. Analog VU meters with IGS Custom scales.\u003c\/p\u003e\n\n\u003ch3\u003eKEY FEATURES\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eDiscrete diode-bridge compressor (Neve\/EMI 2254-style), dual-mono, rackmount\u003c\/li\u003e\n\u003cli\u003eExclusively discrete components – no integrated circuits in the signal path\u003c\/li\u003e\n\u003cli\u003e6 IGS Custom transformers (3 per channel: input, interstage, output)\u003c\/li\u003e\n\u003cli\u003e4 hand-matched pulse diodes – the compression element\u003c\/li\u003e\n\u003cli\u003eAll controls: ELMA switches\u003c\/li\u003e\n\u003cli\u003eSide-chain HPF: OFF \/ 40 \/ 80 \/ 120 \/ 180 \/ 240 \/ 320 Hz\u003c\/li\u003e\n\u003cli\u003e+10THR switch (additional –10 dB threshold offset)\u003c\/li\u003e\n\u003cli\u003eStereo link (side-chain coupling)\u003c\/li\u003e\n\u003cli\u003eHard-wire bypass\u003c\/li\u003e\n\u003cli\u003eAnalog VU meters with IGS Custom scales\u003c\/li\u003e\n\u003cli\u003e3-year manufacturer warranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eTECHNICAL SPECIFICATIONS\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eType: discrete diode-bridge compressor, dual-mono, rackmount\u003c\/li\u003e\n\u003cli\u003eCompression element: bridge of 4 hand-matched pulse diodes\u003c\/li\u003e\n\u003cli\u003eTransformers: 3× IGS Custom per channel (input, interstage, output)\u003c\/li\u003e\n\u003cli\u003eSwitches: ELMA (all controls)\u003c\/li\u003e\n\u003cli\u003eAttack time: 0.1–30 ms\u003c\/li\u003e\n\u003cli\u003eRelease time: 0.1–1.4 s + Auto\u003c\/li\u003e\n\u003cli\u003eSidechain HPF: OFF \/ 40 \/ 80 \/ 120 \/ 180 \/ 240 \/ 320 Hz\u003c\/li\u003e\n\u003cli\u003eMaximum gain: 22 dB\u003c\/li\u003e\n\u003cli\u003eMaximum gain reduction: 30 dB\u003c\/li\u003e\n\u003cli\u003eInput impedance: 10 kΩ (IGS Custom transformer)\u003c\/li\u003e\n\u003cli\u003eOutput impedance: 600 Ω (IGS Custom transformer)\u003c\/li\u003e\n\u003cli\u003eOperating level: +4 dBu\u003c\/li\u003e\n\u003cli\u003eMaximum input level: above +22 dBu\u003c\/li\u003e\n\u003cli\u003eMaximum output level: above +26 dBu\u003c\/li\u003e\n\u003cli\u003eDynamic range: 101 dBA (1 kHz, +24 dBu)\u003c\/li\u003e\n\u003cli\u003eTHD+N: 0.056% (20 Hz – 20 kHz)\u003c\/li\u003e\n\u003cli\u003eIMD (SMPTE): 0.16% (20 Hz – 20 kHz)\u003c\/li\u003e\n\u003cli\u003eSNR: 87 dBA (20 Hz – 20 kHz)\u003c\/li\u003e\n\u003cli\u003eCrosstalk: 91 dB (20 Hz – 20 kHz)\u003c\/li\u003e\n\u003cli\u003eFrequency response: 10 Hz – 25 kHz (+0.2\/–0.4 dB)\u003c\/li\u003e\n\u003cli\u003ePower supply: 115\/230 V AC, 50–60 Hz, internal\u003c\/li\u003e\n\u003cli\u003ePower consumption: 24 W\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e","brand":"IGS Audio","offers":[{"title":"Default Title","offer_id":54001630740817,"sku":"47368","price":2790.0,"currency_code":"EUR","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0729\/8741\/0769\/files\/IGSAudioV8Compressor1.jpg?v=1781181155"},{"product_id":"igs-audio-t4bx","title":"IGS Audio T4Bx","description":"\u003cdiv lang=\"pl\"\u003e\n\u003cstrong\u003eIGS Audio V8 Compressor\u003c\/strong\u003e\n\n\u003cp\u003eV8 to dwukanałowy (dual-mono) kompresor z mostkiem diodowym, zbudowany przez IGS Audio wyłącznie z komponentów dyskretnych i sześciu transformatorów IGS Custom (trzy na kanał: wejście, śródstopień i wyjście). Element kompresji to mostek złożony z czterech impulsowych diod dopasowanych ręcznie według opracowanych procedur – topologia wywodząca się z klasycznego układu Neve\/EMI 2254. Brak jakichkolwiek układów scalonych w torze sygnałowym. Nazewnictwo V8 pochodzi od numeracji projektów wewnątrz IGS Audio – to ósmy kompresor zaprojektowany przez firmę. Wszystkie regulatory to przełączniki ELMA, zapewniające pełną powtarzalność ustawień między sesjami i precyzyjne dopasowanie obu kanałów. Gwarancja: 3 lata.\u003c\/p\u003e\n\n\u003ch3\u003eMostek diodowy jako element kompresji – co odróżnia tę topologię\u003c\/h3\u003e\n\u003cp\u003eKompresory VCA kompresują sygnał przez układ scalony VCA sterowany napięciem ze side-chain. FET kompresuje przez zmianę impedancji tranzystora polowego. Mostek diodowy wprowadza kompresję przez cztery diody w konfiguracji mostka: przy niskim poziomie sygnału diody pracują liniowo, przy wyższym ich charakterystyka krzywa zaczyna ograniczać amplitudę. Kompresja wynika z fizyki złącza p-n przy wyższych poziomach sygnału. Efektem jest charakter dynamiczny zbliżony do FET (szybki, agresywny) z kolorytem harmonicznym typowym dla torów transformatorowo-dyskretnych – cieplejszym i bardziej muzycznym niż czysta elektronika VCA. Dopasowanie czterech diod ręcznymi procedurami IGS Audio minimalizuje rozbieżności między kanałami i zapewnia spójny obraz stereofoniczny przy pracy par modułów. Zakres dynamiczny: 101 dBA przy +24 dBu.\u003c\/p\u003e\n\n\u003ch3\u003eSide-chain HPF, +10THR i link kanałów\u003c\/h3\u003e\n\u003cp\u003eFiltr górnoprzepustowy side-chain z siedmioma krokami (OFF, 40, 80, 120, 180, 240, 320 Hz) wyklucza niskie częstotliwości z obwodu detekcji: kick drum i bas przechodzą bez wyzwalania kompresji, miks oddycha bez pompowania. Dodatkowy przełącznik +10THR obniża próg kompresji o 10 dB – przydatny przy bardzo niskich sygnałach wejściowych lub przy chęci uzyskania bardzo głębokiej kompresji bez cofania regulatora Threshold do skrajnych wartości. Stereo link przez sprzężenie side-chain pozwala prowadzić dwa kanały jako parę stereo z jednym centrum detekcji. Czas ataku: 0,1–30 ms. Release: 0,1–1,4 s + Auto. Maks. redukcja wzmocnienia: 30 dB. Wskaźniki VU z analogowymi skalami IGS Custom.\u003c\/p\u003e\n\n\u003ch3\u003eKLUCZOWE CECHY\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eDyskretny kompresor z mostkiem diodowym (Neve\/EMI 2254-style), dual-mono, rackmount\u003c\/li\u003e\n\u003cli\u003eWyłącznie komponenty dyskretne – bez układów scalonych w torze sygnałowym\u003c\/li\u003e\n\u003cli\u003e6 transformatorów IGS Custom (3 na kanał: wejście, śródstopień, wyjście)\u003c\/li\u003e\n\u003cli\u003e4 impulsowe diody dopasowane ręcznie – element kompresji\u003c\/li\u003e\n\u003cli\u003eWszystkie regulatory: przełączniki ELMA\u003c\/li\u003e\n\u003cli\u003eSide-chain HPF: OFF \/ 40 \/ 80 \/ 120 \/ 180 \/ 240 \/ 320 Hz\u003c\/li\u003e\n\u003cli\u003ePrzełącznik +10THR (dodatkowe –10 dB progu kompresji)\u003c\/li\u003e\n\u003cli\u003eStereo link (sprzężenie side-chain)\u003c\/li\u003e\n\u003cli\u003eHard-wire bypass\u003c\/li\u003e\n\u003cli\u003eWskaźniki VU z analogowymi skalami IGS Custom\u003c\/li\u003e\n\u003cli\u003eGwarancja: 3 lata\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eSPECYFIKACJA TECHNICZNA\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eTyp: dyskretny kompresor z mostkiem diodowym, dual-mono, rackmount\u003c\/li\u003e\n\u003cli\u003eElement kompresji: mostek 4 impulsowych diod (ręcznie dopasowanych)\u003c\/li\u003e\n\u003cli\u003eTransformatory: 3× IGS Custom na kanał (wejście, śródstopień, wyjście)\u003c\/li\u003e\n\u003cli\u003ePrzełączniki: ELMA (wszystkie regulatory)\u003c\/li\u003e\n\u003cli\u003eCzas ataku: 0,1–30 ms\u003c\/li\u003e\n\u003cli\u003eCzas powrotu: 0,1–1,4 s + Auto\u003c\/li\u003e\n\u003cli\u003eSidechain HPF: OFF \/ 40 \/ 80 \/ 120 \/ 180 \/ 240 \/ 320 Hz\u003c\/li\u003e\n\u003cli\u003eMaks. wzmocnienie: 22 dB\u003c\/li\u003e\n\u003cli\u003eMaks. redukcja wzmocnienia: 30 dB\u003c\/li\u003e\n\u003cli\u003eImpedancja wejściowa: 10 kΩ (IGS Custom transformer)\u003c\/li\u003e\n\u003cli\u003eImpedancja wyjściowa: 600 Ω (IGS Custom transformer)\u003c\/li\u003e\n\u003cli\u003ePoziom roboczy: +4 dBu\u003c\/li\u003e\n\u003cli\u003eMaks. poziom wejściowy: powyżej +22 dBu\u003c\/li\u003e\n\u003cli\u003eMaks. poziom wyjściowy: powyżej +26 dBu\u003c\/li\u003e\n\u003cli\u003eZakres dynamiczny: 101 dBA (1 kHz, +24 dBu)\u003c\/li\u003e\n\u003cli\u003eTHD+N: 0,056% (20 Hz – 20 kHz)\u003c\/li\u003e\n\u003cli\u003eIMD (SMPTE): 0,16% (20 Hz – 20 kHz)\u003c\/li\u003e\n\u003cli\u003eSNR: 87 dBA (20 Hz – 20 kHz)\u003c\/li\u003e\n\u003cli\u003eCrosstalk: 91 dB (20 Hz – 20 kHz)\u003c\/li\u003e\n\u003cli\u003ePasmo przenoszenia: 10 Hz – 25 kHz (+0,2\/–0,4 dB)\u003c\/li\u003e\n\u003cli\u003eZasilanie: 115\/230 V AC, 50–60 Hz, wewnętrzne\u003c\/li\u003e\n\u003cli\u003ePobór mocy: 24 W\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e","brand":"IGS Audio","offers":[{"title":"Default Title","offer_id":54001632739665,"sku":"47370","price":135.0,"currency_code":"EUR","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0729\/8741\/0769\/files\/IGSAudioT4Bx.jpg?v=1781181163"},{"product_id":"igs-audio-double-triode-limiter","title":"IGS Audio Double Triode Limiter","description":"\u003cdiv lang=\"en\"\u003e\n\u003cstrong\u003eIGS Audio Double Triode Limiter\u003c\/strong\u003e\n\n\u003cp\u003eThe Double Triode Limiter (DTL) is a two-channel (stereo) tube microphone preamplifier with a built-in opto limiter on each channel, manufactured by IGS Audio. The signal path is fully tube-based: a two-stage triode amplifier with independent saturation control on both stages, a Carnhill input transformer (300 Ω) and an Edcor output transformer (600 Ω). Anode voltage is set to approximately 300 V DC. The limiter is based on an opto topology using an IGS Audio custom-designed photocell: an electroluminescent subcomponent illuminates a photo resistor that directly reduces the gain of the signal path – more light means less amplification. Maximum gain: 60 dB. Maximum gain reduction via limiter: 18 dB. Maximum output level: +22 dBu. Hi-Z inputs: 1 MΩ, on the front panel.\u003c\/p\u003e\n\n\u003ch3\u003eTwo saturation stages – how the DTL shapes the sound\u003c\/h3\u003e\n\u003cp\u003eThe two-stage triode amplifier architecture allows deliberate shaping of tube saturation at each level of the signal path independently. First-stage saturation depends on the input signal level and the Gain setting – higher input gain means deeper harmonic saturation on the first triode before the signal reaches the second stage. The –20 dB input pad enables working with line-level sources (synthesizers, drum machines, DAW reamping) without exceeding the operating point of the first stage. Second-stage saturation is controlled by the Output regulator – independent adjustment of the output level after the first stage changes the operating point of the second triode without affecting the first stage's saturation. The Hi-Z input (1 MΩ, TS jack on the front panel) routes guitar or bass signal directly to the first triode grid, providing direct electrical contact with the tube and its characteristic colour without an active buffer.\u003c\/p\u003e\n\n\u003ch3\u003eOpto limiter and studio applications\u003c\/h3\u003e\n\u003cp\u003eThe IGS Audio custom photocell works on a principle analogous to the LA-2A: the electroluminescent element's light output is proportional to the signal level, and the photo resistor in the signal path reduces gain accordingly. Attack and release times are natural and program-dependent – opto elements do not allow precise time constant adjustment but respond musically without the harshness characteristic of VCA or FET limiting. The threshold range covers everything from gentle dynamic cohesion to hard peak limiting. An LED labelled \"Limit\" on the front panel indicates when the limiter is active. Phantom power +48V, phase reverse switch, and Mic\/Hi-Z switching complete the controls. VU meters display output level. The unit is stereo with two XLR inputs (rear) and two Hi-Z jack inputs (front panel).\u003c\/p\u003e\n\n\u003ch3\u003eKEY FEATURES\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eTwo-channel (stereo) tube Mic\/Hi-Z preamplifier with opto limiter per channel\u003c\/li\u003e\n\u003cli\u003eTwo-stage tube signal path with independent saturation control on both stages\u003c\/li\u003e\n\u003cli\u003eOpto limiter based on IGS Audio custom-designed photocell\u003c\/li\u003e\n\u003cli\u003eInput transformer: Carnhill (300 Ω, balanced)\u003c\/li\u003e\n\u003cli\u003eOutput transformer: Edcor (600 Ω, balanced)\u003c\/li\u003e\n\u003cli\u003eAnode voltage: approx. 300 V DC\u003c\/li\u003e\n\u003cli\u003eHi-Z inputs: 1 MΩ, TS jack on the front panel\u003c\/li\u003e\n\u003cli\u003eMaximum gain: 60 dB\u003c\/li\u003e\n\u003cli\u003eMaximum gain reduction (limiter): 18 dB\u003c\/li\u003e\n\u003cli\u003ePad –20 dB, phantom power +48V, phase reverse switch\u003c\/li\u003e\n\u003cli\u003eVU meters (output) + \"Limit\" LED indicator\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eTECHNICAL SPECIFICATIONS\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eType: two-channel tube microphone preamplifier with opto limiter\u003c\/li\u003e\n\u003cli\u003eSignal path: fully tube-based, two-stage triode amplifier\u003c\/li\u003e\n\u003cli\u003eLimiter: opto (IGS Custom photocell)\u003c\/li\u003e\n\u003cli\u003eInput transformer: Carnhill (300 Ω)\u003c\/li\u003e\n\u003cli\u003eOutput transformer: Edcor (600 Ω)\u003c\/li\u003e\n\u003cli\u003eAnode voltage: approx. 300 V DC\u003c\/li\u003e\n\u003cli\u003eInput impedance (Mic\/Line): 300 Ω (Carnhill)\u003c\/li\u003e\n\u003cli\u003eInput impedance (Hi-Z): 1 MΩ\u003c\/li\u003e\n\u003cli\u003eOutput impedance: 600 Ω (Edcor)\u003c\/li\u003e\n\u003cli\u003eMaximum gain: 60 dB\u003c\/li\u003e\n\u003cli\u003eMaximum gain reduction: 18 dB\u003c\/li\u003e\n\u003cli\u003eOperating level: +4 dBu\u003c\/li\u003e\n\u003cli\u003eMaximum output level: +22 dBu\u003c\/li\u003e\n\u003cli\u003ePad: –20 dB\u003c\/li\u003e\n\u003cli\u003ePhantom power: +48V\u003c\/li\u003e\n\u003cli\u003eInputs: 2× XLR (Mic\/Line, rear) + 2× TS jack Hi-Z (front panel)\u003c\/li\u003e\n\u003cli\u003eOutputs: 2× XLR (balanced)\u003c\/li\u003e\n\u003cli\u003eMetering: VU (output) + Limit LED\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e","brand":"IGS Audio","offers":[{"title":"Default Title","offer_id":54001632805201,"sku":"47371","price":2090.0,"currency_code":"EUR","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0729\/8741\/0769\/files\/IGSAudioDoubleTriodeLimiter1.jpg?v=1781176289"},{"product_id":"igs-audio-panzer-500","title":"IGS Audio Panzer 500","description":"\u003cdiv lang=\"en\"\u003e\n\u003cstrong\u003eIGS Audio Panzer 500\u003c\/strong\u003e\n\n\u003cp\u003eThe Panzer 500 is a 10-slot API 500-series enclosure with an external linear power supply, designed by IGS Audio as the central point of a permanent studio rack or a mobile recording setup. The key specification that distinguishes the Panzer 500 from standard 500-series frames is the output current: 420 mA per slot, against the 130 mA defined as standard by the API 500-series specification. This three-times headroom allows powering modules that cause problems in typical frames: the Tubecore 500 (vari-mu tube compressor) and One LA 500 (opto tube compressor) draw significantly more current than solid-state modules and require exactly this kind of power supply headroom. The external PSU eliminates coupling of power supply noise into the signal path of the modules – the PSU enclosure can be placed away from the rack or on a separate shelf.\u003c\/p\u003e\n\n\u003ch3\u003eExternal linear PSU – why it matters for signal quality\u003c\/h3\u003e\n\u003cp\u003eMost 500-series frames use an internal power supply placed directly behind the module slots. The mains transformer and rectifier generate magnetic fields and electrical interference that can couple into sensitive audio circuits in close proximity. The Panzer 500's external power supply physically separates these interference sources from the modules: the PSU can be placed at whatever distance the power cable allows. A linear power supply – as opposed to a switching supply – operates without the high-frequency switching that would inject noise onto the module power rails. Three LED voltage presence indicators on the front panel for the ±16 V and +48 V rails allow instant verification of power status without measurements.\u003c\/p\u003e\n\n\u003ch3\u003eProtection and stereo linking\u003c\/h3\u003e\n\u003cp\u003eThe Panzer 500 includes global overload and short-circuit protection as well as individual protection per slot – a damaged module does not affect the rest of the frame. Stereo linking is implemented via a PCB jumper, which is the standard approach in 500-series frames and allows any adjacent pair of slots to be linked for modules that require stereo-link operation (S-Type 500 VU, Alter 500, Bison 500, etc.). The steel rackmount enclosure houses 10 slots in a standard 3U 19\" format. Maximum power consumption under full load: 160 W. Shipping dimensions: 20×40×50 cm. Shipping weight: 8 kg.\u003c\/p\u003e\n\n\u003ch3\u003eKEY FEATURES\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e10-slot API 500-series frame with external linear power supply\u003c\/li\u003e\n\u003cli\u003e420 mA per slot – three times above the API standard (130 mA)\u003c\/li\u003e\n\u003cli\u003eExternal linear PSU – power supply noise isolated from the module signal path\u003c\/li\u003e\n\u003cli\u003ePower rails: +16 V (200 mA\/slot), –16 V (200 mA\/slot), +48 V phantom (20 mA\/slot)\u003c\/li\u003e\n\u003cli\u003eShort-circuit and overload protection: global + individual per slot\u003c\/li\u003e\n\u003cli\u003eStereo link: via PCB jumper\u003c\/li\u003e\n\u003cli\u003eVoltage presence indicators: 3× LED (±16 V, +48 V)\u003c\/li\u003e\n\u003cli\u003eCompatible with all API 500-series modules\u003c\/li\u003e\n\u003cli\u003eSteel rackmount enclosure, 3U 19\"\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eTECHNICAL SPECIFICATIONS\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eType: API 500-series frame with external linear power supply\u003c\/li\u003e\n\u003cli\u003eNumber of slots: 10\u003c\/li\u003e\n\u003cli\u003eCurrent per slot: 420 mA total (200 mA @ +16 V \/ 200 mA @ –16 V \/ 20 mA @ +48 V)\u003c\/li\u003e\n\u003cli\u003ePower supply: external, linear\u003c\/li\u003e\n\u003cli\u003eMains voltage: 115\/230 V, 50\/60 Hz\u003c\/li\u003e\n\u003cli\u003eMaximum power consumption: 160 W (full load)\u003c\/li\u003e\n\u003cli\u003eStereo link: yes (via PCB jumper)\u003c\/li\u003e\n\u003cli\u003eProtection: short-circuit and overload, global + per slot\u003c\/li\u003e\n\u003cli\u003eIndicators: 3× LED (±16 V, +48 V)\u003c\/li\u003e\n\u003cli\u003eFormat: 3U, 19\"\u003c\/li\u003e\n\u003cli\u003eShipping dimensions: 20×40×50 cm\u003c\/li\u003e\n\u003cli\u003eShipping weight: 8 kg\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e","brand":"IGS Audio","offers":[{"title":"Default Title","offer_id":54001633165649,"sku":"47372","price":870.0,"currency_code":"EUR","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0729\/8741\/0769\/files\/IGSAudioPanzer5001.jpg?v=1781176273"},{"product_id":"igs-audio-tilt-n-bands","title":"IGS Audio Tilt n Bands","description":"\u003cdiv lang=\"en\"\u003e\n\u003cstrong\u003eIGS Audio Tilt n Bands\u003c\/strong\u003e\n\n\u003cp\u003eTilt n Bands is a tube stereo mastering equalizer with an internal linear power supply, designed by Igor Sobczyk of IGS Audio based on a vintage hi-fi circuit with a transformer-balanced tube output stage. The signal path runs through IGS Custom transformers on input and output and six 6N1P triode valves; level metering uses 6E2 magic eye tubes – vacuum indicator tubes from 1950s and 1960s hi-fi amplifiers. Three bands (bass, mid, treble) with selectable frequencies and Q adjustable from 0.5 to 5 are joined by a TILT control – a linear tilt of the entire frequency response curve up to a maximum slope of 1 dB\/oct. Hard-wire bypass. Internal linear power supply 115\/230 V. Power consumption: 64 W. Shipping weight: 11 kg.\u003c\/p\u003e\n\n\u003ch3\u003eThe TILT control – how it differs from shelving\u003c\/h3\u003e\n\u003cp\u003eA conventional shelving filter boosts or cuts one end of the frequency range at a fixed corner frequency, leaving the other end flat. A tilt filter rotates the entire frequency response around a centre pivot point – simultaneously boosting the low end while cutting the high end (or vice versa), producing a curve that is close to a straight line. In the Tilt n Bands, the TILT control generates a nearly ruler-straight slope to a maximum of 1 dB\/oct, meaning at full deflection the difference between 20 Hz and 20 kHz is approximately 10 dB. This is a global tonal balance tool for mixes and masters: if a mix sits too bright, one TILT adjustment rebalances it without touching individual band relationships. The straight slope avoids the resonances and phase distortions that shelving filters introduce at extreme settings.\u003c\/p\u003e\n\n\u003ch3\u003eThree switchable bands through a tube circuit\u003c\/h3\u003e\n\u003cp\u003eThe bass band offers 50, 100, or 250 Hz; mid offers 500 Hz, 1 kHz, or 2.5 kHz; treble offers 5, 10, or 12.5 kHz. Each band is controlled by a ±10 dB knob with a centre detent at 0 dB. A TRIM control handles overall output level adjustment. The 6N1P tube circuit in a transformer-balanced configuration adds the colouration and saturation character of vintage hi-fi design – the unit is aimed primarily at mastering and mix bus work, where a few decibels of correction at selected frequencies is sufficient to reshape the entire tonal balance. Frequency response: 20 Hz – 40 kHz ±0.3 dB. THD+N: 0.08% at 1 kHz and +4 dBu. Crosstalk: above 120 dB.\u003c\/p\u003e\n\n\u003ch3\u003eKEY FEATURES\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eTube stereo mastering equalizer with TILT filter and three selectable bands\u003c\/li\u003e\n\u003cli\u003eTILT filter: linear slope up to 1 dB\/oct across the full frequency range\u003c\/li\u003e\n\u003cli\u003eBASS band: 50 \/ 100 \/ 250 Hz (±10 dB)\u003c\/li\u003e\n\u003cli\u003eMID band: 500 Hz \/ 1 kHz \/ 2.5 kHz (±10 dB)\u003c\/li\u003e\n\u003cli\u003eHIGH band: 5 \/ 10 \/ 12.5 kHz (±10 dB)\u003c\/li\u003e\n\u003cli\u003eQ: 0.5–5\u003c\/li\u003e\n\u003cli\u003eIGS Custom transformers on input and output\u003c\/li\u003e\n\u003cli\u003eTubes: 6× 6N1P + 2× 6E2 (magic eye level indicators)\u003c\/li\u003e\n\u003cli\u003eHard-wire bypass\u003c\/li\u003e\n\u003cli\u003eTRIM control for output level\u003c\/li\u003e\n\u003cli\u003eInternal linear power supply 115\/230 V\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eTECHNICAL SPECIFICATIONS\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eType: tube stereo equalizer with tilt filter, rackmount\u003c\/li\u003e\n\u003cli\u003eTubes: 6× 6N1P + 2× 6E2 (magic eye)\u003c\/li\u003e\n\u003cli\u003eTransformers: IGS Custom (input and output)\u003c\/li\u003e\n\u003cli\u003eBASS band: 50 \/ 100 \/ 250 Hz\u003c\/li\u003e\n\u003cli\u003eMID band: 500 Hz \/ 1 kHz \/ 2.5 kHz\u003c\/li\u003e\n\u003cli\u003eHIGH band: 5 \/ 10 \/ 12.5 kHz\u003c\/li\u003e\n\u003cli\u003eQ: 0.5–5\u003c\/li\u003e\n\u003cli\u003eBand correction range: ±10 dB\u003c\/li\u003e\n\u003cli\u003eTILT filter: up to 1 dB\/oct linear slope\u003c\/li\u003e\n\u003cli\u003eInput impedance: 10 kΩ (balanced)\u003c\/li\u003e\n\u003cli\u003eOutput impedance: 600 Ω (balanced)\u003c\/li\u003e\n\u003cli\u003eOperating level: +4 dBu\u003c\/li\u003e\n\u003cli\u003eMaximum output level: +19 dBu\u003c\/li\u003e\n\u003cli\u003eFrequency response: 20 Hz – 40 kHz ±0.3 dB\u003c\/li\u003e\n\u003cli\u003eTHD+N: 0.08% (1 kHz, +4 dBu)\u003c\/li\u003e\n\u003cli\u003eCrosstalk: above 120 dB\u003c\/li\u003e\n\u003cli\u003eMetering: 6E2 magic eye tubes\u003c\/li\u003e\n\u003cli\u003eBypass: hard-wire\u003c\/li\u003e\n\u003cli\u003ePower supply: 115\/230 V, 50\/60 Hz, linear, internal\u003c\/li\u003e\n\u003cli\u003ePower consumption: 64 W\u003c\/li\u003e\n\u003cli\u003eShipping weight: 11 kg\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e","brand":"IGS Audio","offers":[{"title":"Default Title","offer_id":54001633231185,"sku":"47373","price":2790.0,"currency_code":"EUR","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0729\/8741\/0769\/files\/IGSAudioTiltnBands1.jpg?v=1781176253"},{"product_id":"igs-audio-iq-inductor-equalizer","title":"IGS Audio iQ. Inductor Equalizer","description":"\u003cdiv lang=\"en\"\u003e\n\u003cstrong\u003eIGS Audio iQ. Inductor Equalizer\u003c\/strong\u003e\n\n\u003cp\u003eThe iQ. Inductor Equalizer is a dual-mono parametric equalizer with inductors in the filter circuits, housed in a rackmount unit with an internal power supply, designed by IGS Audio for recording, mixing, and mastering duties. Four bands – SUB, BASS, MID, and HIGH – cover 28 Hz to 25 kHz with overlapping frequency ranges, allowing two bands to operate simultaneously in the same frequency region. Each band has its own independent bypass switch. A global hard-wire bypass completes the control layout. Inductors in the filter path give the correction a different character from RC-based designs: gain curves are asymmetric and behave similarly to transformer saturation at higher correction values. Q is adjustable from 0.3 to 6. Correction range: ±10 dB per band. Output impedance: 600 Ω, input: 10 kΩ. Maximum output level: +26 dBu. Internal 115\/230 V power supply. Power consumption: 25 W.\u003c\/p\u003e\n\n\u003ch3\u003eInductors instead of capacitors – where the different character comes from\u003c\/h3\u003e\n\u003cp\u003eStandard active EQs build their filter sections on RC circuits (resistors and capacitors). The iQ. Inductor Equalizer uses inductors – coils – as the reactive elements in the filter sections. Inductors behave differently from capacitors in the signal path: their phase characteristic, magnetic saturation behaviour, and interaction with the rest of the circuit at higher signal levels all differ from RC equivalents. An inductor can saturate in a way similar to a transformer, introducing subtle harmonic colouration at higher correction values that RC filters do not generate. Simultaneous boosting and cutting at nearby frequencies – a classic tonal shaping technique in analog equalizers – produces asymmetric, non-cancelling curves with a phase signature that digital EQ cannot replicate. Each of the four bands can be bypassed individually without affecting the others.\u003c\/p\u003e\n\n\u003ch3\u003eFour bands with overlapping ranges – for precise and creative work\u003c\/h3\u003e\n\u003cp\u003eThe SUB band covers 28–300 Hz (shelf), BASS covers 280 Hz – 3 kHz (peak), MID covers 2.2–12.5 kHz (peak), and HIGH covers 8–25 kHz (shelf). The overlapping band boundaries allow complex correction curves combining two bands in the same frequency region with different Q values and different gain amounts – for example, a broad bass boost at Q 0.3 simultaneously with a narrow notch within the same range at Q 6. The dual-mono configuration means each stereo channel has a fully independent four-band equalizer; the unit can work as a stereo processor with matched settings or as two independent mono processors in a single rack unit. Crosstalk: 100 dB. Frequency response: 20 Hz – 20 kHz ±0.1 dB.\u003c\/p\u003e\n\n\u003ch3\u003eKEY FEATURES\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e4-band parametric equalizer, dual-mono, with inductors in the filter circuits\u003c\/li\u003e\n\u003cli\u003eOverlapping band frequency ranges – two bands operable simultaneously in the same region\u003c\/li\u003e\n\u003cli\u003eSUB: 28–300 Hz (shelf) | BASS: 280 Hz – 3 kHz (peak)\u003c\/li\u003e\n\u003cli\u003eMID: 2.2–12.5 kHz (peak) | HIGH: 8–25 kHz (shelf)\u003c\/li\u003e\n\u003cli\u003eQ: 0.3–6 (each band independently)\u003c\/li\u003e\n\u003cli\u003eCorrection range: ±10 dB per band\u003c\/li\u003e\n\u003cli\u003eIndividual bypass per band + global hard-wire bypass\u003c\/li\u003e\n\u003cli\u003eInductors saturate like transformers at higher correction values\u003c\/li\u003e\n\u003cli\u003eCrosstalk: 100 dB\u003c\/li\u003e\n\u003cli\u003eInternal 115\/230 V power supply\u003c\/li\u003e\n\u003cli\u003e3-year manufacturer warranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eTECHNICAL SPECIFICATIONS\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eType: inductor parametric equalizer, dual-mono, rackmount\u003c\/li\u003e\n\u003cli\u003eChannels: 2 (dual-mono)\u003c\/li\u003e\n\u003cli\u003eBands per channel: 4 (SUB, BASS, MID, HIGH)\u003c\/li\u003e\n\u003cli\u003eBand ranges: SUB 28–300 Hz \/ BASS 280 Hz–3 kHz \/ MID 2.2–12.5 kHz \/ HIGH 8–25 kHz\u003c\/li\u003e\n\u003cli\u003eQ: 0.3–6\u003c\/li\u003e\n\u003cli\u003eCorrection range: ±10 dB\u003c\/li\u003e\n\u003cli\u003eBypass: global hard-wire + individual per band\u003c\/li\u003e\n\u003cli\u003eInput impedance: 10 kΩ (balanced)\u003c\/li\u003e\n\u003cli\u003eOutput impedance: 600 Ω (balanced)\u003c\/li\u003e\n\u003cli\u003eOperating level: +4 dBu\u003c\/li\u003e\n\u003cli\u003eMaximum input level: +22 dBu\u003c\/li\u003e\n\u003cli\u003eMaximum output level: +26 dBu\u003c\/li\u003e\n\u003cli\u003eCrosstalk: 100 dB\u003c\/li\u003e\n\u003cli\u003eFrequency response: 20 Hz – 20 kHz ±0.1 dB\u003c\/li\u003e\n\u003cli\u003ePower supply: 115\/230 V, 50\/60 Hz (internal)\u003c\/li\u003e\n\u003cli\u003ePower consumption: 25 W\u003c\/li\u003e\n\u003cli\u003eShipping weight: 4 kg\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e","brand":"IGS Audio","offers":[{"title":"Default Title","offer_id":54001634869585,"sku":"47374","price":3390.0,"currency_code":"EUR","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0729\/8741\/0769\/files\/IGSAudioiQ.InductorEqualizer1.jpg?v=1781176235"},{"product_id":"igs-audio-s-type-500-vu","title":"IGS Audio S-Type 500 VU","description":"\u003cdiv lang=\"en\"\u003e\n\u003cstrong\u003eIGS Audio S-Type 500 VU\u003c\/strong\u003e\n\n\u003cp\u003eThe S-Type 500 VU is a stereo VCA compressor occupying two API 500 slots, built by IGS Audio on the topology of the SSL SL 4000 G Series mix bus compressor – one of the most widely used dynamics processors in the history of mixing. The gain control element is a THAT VCA chip, replacing the now unavailable DBX VCA of the original. The signal path is balanced throughout using four fast op-amps on inputs and outputs. The two stereo channels are summed in the side-chain detection circuit to control both VCA stages simultaneously, delivering the same stereo link behaviour as the original G Series design. A moving-coil needle VU meter replaced the LED bar of the previous S-Type 500 version and serves as the gain reduction indicator. SNR: –102 dBA. THD+N: 0.012% at 0 dBu. Frequency response: 8 Hz – 20 kHz ±0.1 dB. Power consumption: 4.5 W.\u003c\/p\u003e\n\n\u003ch3\u003eSidechain HPF, external side-chain input and New York mode\u003c\/h3\u003e\n\u003cp\u003eThe S-Type 500 VU adds three functions to the original SSL G Series topology. The sidechain highpass filter with six steps (Ext, Off, 60, 90, 120, 180, 240 Hz) excludes low-frequency content from the detection circuit – bass and kick drum energy does not trigger compression, the mix breathes more freely without pumping. The external side-chain input (EXSC) routes a separate signal into the detection path, enabling ducking applications such as music compression triggered by a voice-over channel, or dynamic side-chain effects. New York mode routes only the left detection channel to control both VCA stages simultaneously – effectively a mono side-chain over a stereo signal path, useful where programme material requires detection from a single independent source rather than the summed stereo bus.\u003c\/p\u003e\n\n\u003ch3\u003eMix knob and gain staging – parallel compression without external routing\u003c\/h3\u003e\n\u003cp\u003eThe Mix control implements parallel compression directly in the module: from 100% dry (compressor transparent, full bypass of character) to 100% wet (full compression). The 20–80% wet range is the standard starting point for drums and group buses – aggressive compression on the wet path adds punch and density while the dry signal preserves dynamics and transients. Threshold is detented from –20 to 0 dB. Output provides up to +20 dB makeup gain with detents. Attack: 0.1 \/ 0.3 \/ 1 \/ 3 \/ 10 \/ 30 ms (six steps). Release: 0.1 \/ 0.3 \/ 0.6 \/ 1.2 s \/ Auto \/ 2.0 s (six steps). Ratio: 2:1 \/ 4:1 \/ 10:1. Maximum gain reduction: 20 dB.\u003c\/p\u003e\n\n\u003ch3\u003eKEY FEATURES\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eStereo VCA compressor (SSL G Series-style), dual-slot API 500\u003c\/li\u003e\n\u003cli\u003eTHAT VCA chip replacing the unavailable DBX\u003c\/li\u003e\n\u003cli\u003eFour fast op-amps on inputs and outputs\u003c\/li\u003e\n\u003cli\u003eMoving-coil needle VU meter – gain reduction display\u003c\/li\u003e\n\u003cli\u003eRatio: 2:1 \/ 4:1 \/ 10:1\u003c\/li\u003e\n\u003cli\u003eAttack: 0.1 \/ 0.3 \/ 1 \/ 3 \/ 10 \/ 30 ms\u003c\/li\u003e\n\u003cli\u003eRelease: 0.1 \/ 0.3 \/ 0.6 \/ 1.2 s \/ Auto \/ 2.0 s\u003c\/li\u003e\n\u003cli\u003eSidechain HPF: Ext \/ Off \/ 60 \/ 90 \/ 120 \/ 180 \/ 240 Hz\u003c\/li\u003e\n\u003cli\u003eExternal side-chain input (EXSC)\u003c\/li\u003e\n\u003cli\u003eNew York mode (mono side-chain controls both VCA stages)\u003c\/li\u003e\n\u003cli\u003eMix knob – parallel compression with no external routing\u003c\/li\u003e\n\u003cli\u003eSNR: –102 dBA\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eTECHNICAL SPECIFICATIONS\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eType: stereo VCA compressor (SSL G Series-style), dual-slot API 500\u003c\/li\u003e\n\u003cli\u003eGain control element: THAT VCA\u003c\/li\u003e\n\u003cli\u003eRatio: 2:1 \/ 4:1 \/ 10:1\u003c\/li\u003e\n\u003cli\u003eAttack: 0.1 \/ 0.3 \/ 1 \/ 3 \/ 10 \/ 30 ms\u003c\/li\u003e\n\u003cli\u003eRelease: 0.1 \/ 0.3 \/ 0.6 \/ 1.2 s \/ Auto \/ 2.0 s\u003c\/li\u003e\n\u003cli\u003eThreshold: –20 to 0 dB\u003c\/li\u003e\n\u003cli\u003eSidechain HPF: Ext \/ Off \/ 60 \/ 90 \/ 120 \/ 180 \/ 240 Hz\u003c\/li\u003e\n\u003cli\u003eMaximum gain: 20 dB\u003c\/li\u003e\n\u003cli\u003eMaximum gain reduction: 20 dB\u003c\/li\u003e\n\u003cli\u003eInput impedance: 10 kΩ (balanced)\u003c\/li\u003e\n\u003cli\u003eOutput impedance: 600 Ω (balanced)\u003c\/li\u003e\n\u003cli\u003eOperating level: +4 dBu\u003c\/li\u003e\n\u003cli\u003eMaximum input level: +20 dBu\u003c\/li\u003e\n\u003cli\u003eMaximum output level: +21 dBu\u003c\/li\u003e\n\u003cli\u003eSNR: –102 dBA\u003c\/li\u003e\n\u003cli\u003eTHD+N: 0.012% (0 dBu)\u003c\/li\u003e\n\u003cli\u003eFrequency response: 8 Hz – 20 kHz ±0.1 dB\u003c\/li\u003e\n\u003cli\u003ePower consumption: 4.5 W\u003c\/li\u003e\n\u003cli\u003eShipping weight: 1 kg\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e","brand":"IGS Audio","offers":[{"title":"Default Title","offer_id":54001635197265,"sku":"47375","price":725.0,"currency_code":"EUR","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0729\/8741\/0769\/files\/IGSAudioS-Type500VU1.jpg?v=1781176219"},{"product_id":"igs-audio-rb-500-me","title":"IGS Audio RB 500 ME","description":"\u003cdiv lang=\"en\"\u003e\n\u003cstrong\u003eIGS Audio RB 500 ME\u003c\/strong\u003e\n\n\u003cp\u003eThe RB 500 ME (Rubber Bands 500 Mastering Edition) is a stereo passive Pultec EQP-1A-style equalizer occupying two API 500 slots. It is the first stereo unit of this type in the 500-series format – an unusual proposition in a market where most Pultec 500-series offerings are mono only. The input is transformer-balanced via Carnhill transformers (one per channel); the output runs through Edcor transformers (one per channel) – four audio transformers in a single dual-slot module, which is what gives the unit the density and tonal weight that reviewers compare to full-sized rack processors. The filter section is entirely passive; a discrete Class A driver stage recovers the insertion loss of the passive network. ELMA switches on all frequency selections and stepped pots throughout ensure full session recall. Frequency response: 20 Hz – 20 kHz ±0.1 dB. THD+N: 0.012%. Crosstalk: 75 dB. Power consumption: 7 W.\u003c\/p\u003e\n\n\u003ch3\u003eIndependent boost and cut frequency selectors in the bass band – the key mastering feature\u003c\/h3\u003e\n\u003cp\u003eThe classic Pultec EQP-1A links the boost and cut frequency selection in the low band to a single shared switch – boosting and cutting the same frequency simultaneously produces the characteristic asymmetric curve with an accentuated fundamental and reduced mud. The RB 500 ME separates these selectors: an independent frequency switch for the boost section and an independent switch for the cut section in the low band. This means boosting 30 Hz and cutting 100 Hz simultaneously is possible, producing a bass silhouette with an extended sub-bass shelf and a thinned-out lower midrange – without the two selections blocking each other on the same switch position. Bass band: 20, 30, 60, 100, 180, 240 Hz (boost and cut up to ±20 dB). HF boost: 5, 6, 8, 10, 12, 16 kHz (up to +20 dB, Q 0.5–10). HF cut: 6, 10, 20 kHz (up to –20 dB).\u003c\/p\u003e\n\n\u003ch3\u003eStereo operation and mix bus \/ mastering applications\u003c\/h3\u003e\n\u003cp\u003eAs a stereo module in two 500-series slots, the RB 500 ME processes both channels simultaneously with matched settings – making it a ready-to-insert stereo tool on mix buses and mastering chains without the need to buy two mono units and synchronise their positions. Passive Pultec-style correction on a stereo bus behaves differently from active or digital EQ at equivalent gain settings: HF boost at 10–16 kHz adds air without hardness, low-band boost at 30–60 Hz adds body without mud, and simultaneous boost and cut on the same or nearby frequency produces curves that linear-phase digital EQs cannot replicate. Input impedance 1 kΩ (Carnhill), output impedance 600 Ω (Edcor). Headroom: 18 dB above +4 dBu.\u003c\/p\u003e\n\n\u003ch3\u003eKEY FEATURES\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eStereo passive Pultec-style equalizer (EQP-1A), dual-slot API 500\u003c\/li\u003e\n\u003cli\u003eFirst stereo Pultec EQ in 500-series format\u003c\/li\u003e\n\u003cli\u003eFour audio transformers: Carnhill (inputs) + Edcor (outputs)\u003c\/li\u003e\n\u003cli\u003eDiscrete Class A output stage\u003c\/li\u003e\n\u003cli\u003eIndependent frequency selectors for bass boost and bass cut\u003c\/li\u003e\n\u003cli\u003eBASS band: 20 \/ 30 \/ 60 \/ 100 \/ 180 \/ 240 Hz (boost and cut up to ±20 dB)\u003c\/li\u003e\n\u003cli\u003eHF Boost: 5 \/ 6 \/ 8 \/ 10 \/ 12 \/ 16 kHz (up to +20 dB, Q 0.5–10)\u003c\/li\u003e\n\u003cli\u003eHF Cut: 6 \/ 10 \/ 20 kHz (up to –20 dB)\u003c\/li\u003e\n\u003cli\u003eELMA switches + stepped pots – full session recall\u003c\/li\u003e\n\u003cli\u003eHard-wire bypass\u003c\/li\u003e\n\u003cli\u003eTHD+N: 0.012%, crosstalk: 75 dB\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eTECHNICAL SPECIFICATIONS\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eType: stereo passive equalizer (Pultec EQP-1A style), dual-slot API 500\u003c\/li\u003e\n\u003cli\u003eInput transformers: Carnhill (1 per channel)\u003c\/li\u003e\n\u003cli\u003eOutput transformers: Edcor (1 per channel)\u003c\/li\u003e\n\u003cli\u003eOutput stage: Class A (discrete)\u003c\/li\u003e\n\u003cli\u003eQ: 0.5–10\u003c\/li\u003e\n\u003cli\u003eCorrection range: ±20 dB\u003c\/li\u003e\n\u003cli\u003eBASS (boost and cut): 20 \/ 30 \/ 60 \/ 100 \/ 180 \/ 240 Hz\u003c\/li\u003e\n\u003cli\u003eHF Boost: 5 \/ 6 \/ 8 \/ 10 \/ 12 \/ 16 kHz\u003c\/li\u003e\n\u003cli\u003eHF Cut: 6 \/ 10 \/ 20 kHz\u003c\/li\u003e\n\u003cli\u003eInput impedance: 1 kΩ (Carnhill)\u003c\/li\u003e\n\u003cli\u003eOutput impedance: 600 Ω (Edcor)\u003c\/li\u003e\n\u003cli\u003eOperating level: +4 dBu\u003c\/li\u003e\n\u003cli\u003eMaximum input level: +20 dBu\u003c\/li\u003e\n\u003cli\u003eMaximum output level: +22 dBu\u003c\/li\u003e\n\u003cli\u003eHeadroom: 18 dB\u003c\/li\u003e\n\u003cli\u003eSNR: –99 dBA\u003c\/li\u003e\n\u003cli\u003eTHD+N: 0.012%\u003c\/li\u003e\n\u003cli\u003eCrosstalk: 75 dB\u003c\/li\u003e\n\u003cli\u003eFrequency response: 20 Hz – 20 kHz ±0.1 dB\u003c\/li\u003e\n\u003cli\u003eHard-wire bypass: yes\u003c\/li\u003e\n\u003cli\u003ePower consumption: 7 W\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e","brand":"IGS Audio","offers":[{"title":"Default Title","offer_id":54001635230033,"sku":"47377","price":995.0,"currency_code":"EUR","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0729\/8741\/0769\/files\/IGSAudioRB500ME1.jpg?v=1781176203"},{"product_id":"igs-audio-tubecore-500","title":"IGS Audio Tubecore 500","description":"\u003cdiv lang=\"en\"\u003e\n\u003cstrong\u003eIGS Audio Tubecore 500\u003c\/strong\u003e\n\n\u003cp\u003eThe Tubecore 500 is a vari-mu tube compressor in API 500 format, hand-built by IGS Audio as one of the very few genuine tube compressors available in this standard. Compression is achieved via remote cut-off of tube biasing – the classic vari-mu topology used in legendary units such as the Fairchild 660\/670 and the Manley Variable Mu. There are no op-amps in the signal path: a Carnhill input transformer and Sowter output transformer bracket a fully symmetric, balanced tube circuit. JJ tubes are powered at 250 V DC – a voltage many times higher than the 500-series power rail, requiring an internal voltage step-up stage within the module. Every unit is hand-assembled with matched components – 1% metal film resistors and 2.5% Wima capacitors – and individually calibrated before shipment. Shipping weight: 2 kg.\u003c\/p\u003e\n\n\u003ch3\u003eVari-mu – how tube biasing compresses and why it sounds different from VCA or FET\u003c\/h3\u003e\n\u003cp\u003eIn a vari-mu compressor the tube is both the amplification element and the gain-control element: as the signal level rises, it changes the tube's operating point via the grid voltage, which directly changes the gain. There is no controlling transistor, no VCA – the tube does both jobs simultaneously. The result is a compression curve with a logarithmic threshold character and an exceptionally musical response at low and moderate gain reduction levels. Attack times of 10–300 ms and release times of 0.1–4 s are intentionally slower than FET or VCA designs – the compressor does not catch transients but shapes the dynamics of the material over a longer time window, which means the programme retains its life and energy even under deep gain reduction. Maximum gain reduction is 30 dB.\u003c\/p\u003e\n\n\u003ch3\u003eStereo linking and mastering applications\u003c\/h3\u003e\n\u003cp\u003eTwo Tubecore 500 modules can be linked as a stereo pair: the unit with the deeper compression setting or slower attack\/release becomes the master and controls the gain reduction of the other. Additional jumpers on the rear of the PCB allow independent adjustment of the input and output levels of each module – particularly useful when working with very deep compression where gain staging between modules affects the tonal character. The needle VU meter with an analog scale monitors the amount of gain reduction. Frequency response: ±0.2 dB across 20 Hz – 20 kHz. Maximum gain: 35–40 dB. Maximum levels: +22 dBu input and output.\u003c\/p\u003e\n\n\u003ch3\u003eKEY FEATURES\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eVari-mu tube compressor, API 500 format, mono\u003c\/li\u003e\n\u003cli\u003eCompression via remote cut-off tube biasing (vari-mu topology)\u003c\/li\u003e\n\u003cli\u003eNo op-amps in the signal path – pure tube circuit\u003c\/li\u003e\n\u003cli\u003eFully symmetric signal path from input to output\u003c\/li\u003e\n\u003cli\u003eInput transformer: Carnhill\u003c\/li\u003e\n\u003cli\u003eOutput transformer: Sowter\u003c\/li\u003e\n\u003cli\u003eJJ tubes powered at 250 V DC\u003c\/li\u003e\n\u003cli\u003eHand-assembled, matched components (1% resistors, 2.5% Wima capacitors)\u003c\/li\u003e\n\u003cli\u003eIndividual calibration per unit\u003c\/li\u003e\n\u003cli\u003eStereo link: two modules linkable as a master\/slave stereo pair\u003c\/li\u003e\n\u003cli\u003ePCB jumpers for independent I\/O level adjustment under deep compression\u003c\/li\u003e\n\u003cli\u003eNeedle VU meter with analog scale\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eTECHNICAL SPECIFICATIONS\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eType: vari-mu tube compressor, API 500, mono\u003c\/li\u003e\n\u003cli\u003eGain control element: remote cut-off tube biasing (vari-mu)\u003c\/li\u003e\n\u003cli\u003eTubes: JJ (powered at 250 V DC)\u003c\/li\u003e\n\u003cli\u003eInput transformer: Carnhill\u003c\/li\u003e\n\u003cli\u003eOutput transformer: Sowter\u003c\/li\u003e\n\u003cli\u003eAttack time: 10–300 ms\u003c\/li\u003e\n\u003cli\u003eRelease time: 0.1–4 s\u003c\/li\u003e\n\u003cli\u003eMaximum gain: 35–40 dB\u003c\/li\u003e\n\u003cli\u003eMaximum gain reduction: 30 dB\u003c\/li\u003e\n\u003cli\u003eMaximum input level: +22 dBu\u003c\/li\u003e\n\u003cli\u003eMaximum output level: +22 dBu\u003c\/li\u003e\n\u003cli\u003eFrequency response: ±0.2 dB, 20 Hz – 20 kHz\u003c\/li\u003e\n\u003cli\u003eStereo link: yes (master\/slave via PCB)\u003c\/li\u003e\n\u003cli\u003eComponents: 1% metal film resistors, 2.5% Wima capacitors\u003c\/li\u003e\n\u003cli\u003eFormat: API 500, single slot\u003c\/li\u003e\n\u003cli\u003eShipping weight: 2 kg\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e","brand":"IGS Audio","offers":[{"title":"Default Title","offer_id":54001635262801,"sku":"47378","price":905.0,"currency_code":"EUR","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0729\/8741\/0769\/files\/IGSAudioTubecore5001.jpg?v=1781176187"},{"product_id":"igs-audio-ne573","title":"IGS Audio NE573","description":"\u003cdiv lang=\"en\"\u003e\n\u003cstrong\u003eIGS Audio NE573\u003c\/strong\u003e\n\n\u003cp\u003eThe NE573 is a single-channel Class A microphone preamplifier in API 500 format, built by IGS Audio as a faithful circuit recreation of the Neve 1073 first revision. The design focus is on the authenticity of the internal circuit rather than the appearance – which separates the NE573 from cosmetic clones: a Motorola transistor on the output stage, Grayhill switches, IGS Custom transformers (Carnhill in some versions) on input and output, and operation at 24 V rather than the standard 16 V of the 500-series power rail. That last point is critical – the original Neve 1073 ran on higher supply voltage, which directly affects the transistor operating point, headroom, and saturation character at higher input levels. Three-year manufacturer warranty.\u003c\/p\u003e\n\n\u003ch3\u003e24 V instead of 16 V – why supply voltage matters here\u003c\/h3\u003e\n\u003cp\u003eStandard 500-series modules run on ±16 V rails. The NE573 operates at 24 V – requiring a 500-series rack that supports higher voltage or an onboard voltage conversion stage. This is not a marketing decision: higher supply voltage directly shifts the Motorola output transistor's operating point closer to the conditions under which the original 1073 worked. At 16 V, the same circuit behaves differently – lower dynamic headroom before saturation, different harmonic distortion characteristics when the input is driven hard. The choice of 24 V is a design decision in service of tonal authenticity, not installation convenience. Switchable input impedance at 300\/1200 Ω (via Grayhill switch) changes the loading behaviour on the microphone: 300 Ω gives a more aggressive, closer-to-original 1073 character; 1200 Ω offers more headroom and a gentler tonal interaction with the source.\u003c\/p\u003e\n\n\u003ch3\u003eFront-panel combo jack and stepped gain\u003c\/h3\u003e\n\u003cp\u003eA combo XLR\/TS jack on the front panel handles both microphones and Hi-Z instruments without rerouting cables to the rear XLR when switching between a mic and a direct guitar or bass. The stepped Gain control provides session recall across its range of up to approximately 70 dB, with a separate Output trimmer for fine level adjustment after the gain stage. Phantom power +48V and a phase reverse switch complete the controls. The combination of switchable impedance, front-panel Hi-Z, and full gain range means the NE573 handles virtually any source type in a tracking session without reorganising the signal chain between takes.\u003c\/p\u003e\n\n\u003ch3\u003eKEY FEATURES\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eClass A Mic\/Hi-Z preamplifier, API 500 format, mono (Neve 1073-style)\u003c\/li\u003e\n\u003cli\u003eMotorola transistor on the output stage – as in the original Neve 1073 Rev 1\u003c\/li\u003e\n\u003cli\u003eIGS Custom \/ Carnhill transformers on input and output\u003c\/li\u003e\n\u003cli\u003eGrayhill switches throughout\u003c\/li\u003e\n\u003cli\u003eOperates at 24 V instead of standard 16 V\u003c\/li\u003e\n\u003cli\u003eSwitchable input impedance: 300 \/ 1200 Ω\u003c\/li\u003e\n\u003cli\u003eFront-panel combo XLR\/TS jack (Mic + Hi-Z)\u003c\/li\u003e\n\u003cli\u003eStepped Gain (up to ~70 dB) + Output trimmer\u003c\/li\u003e\n\u003cli\u003ePhantom power +48V\u003c\/li\u003e\n\u003cli\u003ePhase reverse switch\u003c\/li\u003e\n\u003cli\u003e3-year manufacturer warranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eTECHNICAL SPECIFICATIONS\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eType: transformer mic\/Hi-Z preamplifier, Class A, API 500, mono\u003c\/li\u003e\n\u003cli\u003eTopology: Neve 1073 Rev 1-style\u003c\/li\u003e\n\u003cli\u003eOutput transistor: Motorola (original type)\u003c\/li\u003e\n\u003cli\u003eTransformers: IGS Custom \/ Carnhill (input and output)\u003c\/li\u003e\n\u003cli\u003eSwitches: Grayhill\u003c\/li\u003e\n\u003cli\u003eSupply voltage: 24 V (above standard API 500 ±16 V)\u003c\/li\u003e\n\u003cli\u003eInput impedance (balanced): 300 \/ 1200 Ω (switchable)\u003c\/li\u003e\n\u003cli\u003eGain: up to ~70 dB (stepped) + Output trimmer\u003c\/li\u003e\n\u003cli\u003eInputs: XLR (rear) + combo XLR\/TS jack (front, Hi-Z)\u003c\/li\u003e\n\u003cli\u003ePhantom power: +48V (switchable)\u003c\/li\u003e\n\u003cli\u003ePhase reverse: yes\u003c\/li\u003e\n\u003cli\u003eFormat: API 500, single slot\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e","brand":"IGS Audio","offers":[{"title":"Default Title","offer_id":54001635295569,"sku":"47379","price":755.0,"currency_code":"EUR","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0729\/8741\/0769\/files\/IGSAudioNE5731.jpg?v=1781176168"},{"product_id":"igs-audio-576-blue-stripe","title":"IGS Audio 576 Blue Stripe","description":"\u003cdiv lang=\"en\"\u003e\n\u003cstrong\u003eIGS Audio 576 Blue Stripe\u003c\/strong\u003e\n\n\u003cp\u003eThe 576 Blue Stripe is a FET compressor in API 500 format, built by IGS Audio on the UREI 1176 Revision A topology – the original \"Blue Face\" version with its blue front panel, widely regarded as the most aggressive and characterful of the entire 1176 family. Unlike the Alter 500, which targets later 1176 revisions, the 576 Blue Stripe aims specifically at the Rev A circuit: Carnhill transformers on both input and output, and a pure Class A output stage. The input transformer contributes the dense, characterful low-midrange colour associated with transformer-coupled FET compression on the original Rev A hardware. Attack time: 20 µs – 800 µs. Release: 50 ms – 1.1 s. Stereo link via the 500-series power supply rail (PSU). Needle VU meter. Relay bypass.\u003c\/p\u003e\n\n\u003ch3\u003eCarnhill transformers and Class A output – where Rev A differs from later 1176 revisions\u003c\/h3\u003e\n\u003cp\u003eThe original UREI 1176 Revision A used an input transformer in the circuit (later revisions removed or simplified it) and a different output stage configuration. The Carnhill input transformer in the 576 Blue Stripe contributes galvanic isolation and the tonal character of a transformer-coupled FET topology – slightly more body and density in the low-midrange compared to direct-coupled designs. The pure Class A output stage without AB switching maintains lower distortion at normal operating levels and a more linear harmonic profile. Input impedance 2.4 kΩ, output impedance 600 Ω via Carnhill transformer. SNR –99 dBA. Maximum gain 36 dB, maximum gain reduction 20 dB.\u003c\/p\u003e\n\n\u003ch3\u003eSix ratio positions and SLAM – the full dynamic range in one module\u003c\/h3\u003e\n\u003cp\u003eThe 576 Blue Stripe provides the five ratio positions of the original 1176 (4:1, 8:1, 12:1, 20:1) extended by an additional 2:1 not present on the original hardware, plus SLAM mode (All-Buttons-In). The 2:1 ratio opens the compressor to applications where the 1176 circuit character is desired but the amount of compression needs to remain subtle – acoustic guitar, vocals in delicate arrangements, instrument sub-buses. SLAM activates simultaneous engagement of all ratio buttons, producing the non-standard, heavily coloured operating mode with aggressive dynamic behaviour valued on drums, electric bass, and full groups. Attack is adjustable from 20 µs (maximum speed, full transient control) to 800 µs (slow, transients pass through). The Attack knob follows the original 1176 convention: counter-clockwise is slow, clockwise is fast.\u003c\/p\u003e\n\n\u003ch3\u003eKEY FEATURES\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eFET compressor 1176 Rev A-style, API 500 format, mono\u003c\/li\u003e\n\u003cli\u003eInspired by the UREI 1176 Revision A (\"Blue Face\")\u003c\/li\u003e\n\u003cli\u003eCarnhill transformers on both input and output\u003c\/li\u003e\n\u003cli\u003ePure Class A output stage\u003c\/li\u003e\n\u003cli\u003eRatio: 2:1 \/ 4:1 \/ 8:1 \/ 12:1 \/ 20:1 \/ SLAM (All-Buttons-In)\u003c\/li\u003e\n\u003cli\u003eAttack time: 20 µs – 800 µs\u003c\/li\u003e\n\u003cli\u003eRelease time: 50 ms – 1.1 s\u003c\/li\u003e\n\u003cli\u003eNeedle VU meter\u003c\/li\u003e\n\u003cli\u003eStereo link via 500-series PSU rail\u003c\/li\u003e\n\u003cli\u003eRelay bypass\u003c\/li\u003e\n\u003cli\u003e3-year manufacturer warranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eTECHNICAL SPECIFICATIONS\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eType: FET compressor\/limiter (1176 Rev A-style), API 500, mono\u003c\/li\u003e\n\u003cli\u003eGain control element: FET (field-effect transistor)\u003c\/li\u003e\n\u003cli\u003eOutput stage: Class A\u003c\/li\u003e\n\u003cli\u003eTransformers: Carnhill input and output\u003c\/li\u003e\n\u003cli\u003eInput impedance: 2.4 kΩ (balanced)\u003c\/li\u003e\n\u003cli\u003eOutput impedance: 600 Ω (balanced, Carnhill)\u003c\/li\u003e\n\u003cli\u003eRatio: 2:1 \/ 4:1 \/ 8:1 \/ 12:1 \/ 20:1 \/ SLAM\u003c\/li\u003e\n\u003cli\u003eAttack time: 20 µs – 800 µs\u003c\/li\u003e\n\u003cli\u003eRelease time: 50 ms – 1.1 s\u003c\/li\u003e\n\u003cli\u003eMaximum gain: 36 dB\u003c\/li\u003e\n\u003cli\u003eMaximum gain reduction: 20 dB\u003c\/li\u003e\n\u003cli\u003eOperating level: +4 dBu\u003c\/li\u003e\n\u003cli\u003eMaximum input level: +20 dBu\u003c\/li\u003e\n\u003cli\u003eMaximum output level: +22 dBu\u003c\/li\u003e\n\u003cli\u003eSNR: –99 dBA\u003c\/li\u003e\n\u003cli\u003eBypass: relay\u003c\/li\u003e\n\u003cli\u003eStereo link: yes (via 500-series PSU)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e","brand":"IGS Audio","offers":[{"title":"Default Title","offer_id":54001635983697,"sku":"47380","price":795.0,"currency_code":"EUR","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0729\/8741\/0769\/files\/IGSAudio576BlueStripe1.jpg?v=1781176153"},{"product_id":"igs-audio-iq505","title":"IGS Audio iQ505","description":"\u003cdiv lang=\"en\"\u003e\n\u003cstrong\u003eIGS Audio iQ505\u003c\/strong\u003e\n\n\u003cp\u003eThe iQ505 is a fully parametric five-band equalizer in API 500 format, built by IGS Audio in the style of the Sontec MEP-250A – one of the most sought-after analog EQs in the history of mastering and recording engineering. Five bands with overlapping frequency ranges and individual Q control per band (0.5–10) are packed into a single 500-series slot, making the iQ505 one of the very few modules of this type in this format. The signal path uses electronically balanced input and output via THAT chips – integrated circuits designed exclusively for audio applications, chosen for their exceptionally low THD and self-noise. Frequency range: from sub-bass (10 Hz) to 24 kHz. Correction range: ±12 dB per band. Hard-wire bypass. Current draw: 100 mA. Three-year warranty.\u003c\/p\u003e\n\n\u003ch3\u003eFive overlapping bands – what that means for corrective and creative work\u003c\/h3\u003e\n\u003cp\u003eIn conventional parametric equalizers the bands occupy fixed, non-overlapping ranges – the Low band ends where Low-Mid begins. In the iQ505 the bands overlap: band 1 (sub-bass) and band 2 (bass) cover part of the same frequency territory, as do the mid and high bands. This means two bands can be set to the same frequency region with different Q values and different gain amounts – one broad, one narrow – producing curve shapes that are impossible to replicate on an EQ with mutually exclusive bands. Q range from 0.5 (very broad, several octaves) to 10 (narrow notch below one-third octave wide) in each of the five bands delivers surgical precision and broad tonal shaping in the same device without switching tools.\u003c\/p\u003e\n\n\u003ch3\u003eTHAT chips and signal transparency – where the iQ505 differs from other IGS modules\u003c\/h3\u003e\n\u003cp\u003eMost IGS Audio modules build their character around transformers and the colour of tube or FET circuitry. The iQ505 is a deliberate exception: THAT chips are specialised analog integrated circuits designed exclusively for audio – VCAs, differential amplifiers, RMS detectors. In the iQ505 they handle gain and balancing without introducing the tonal character of a Carnhill or Edcor transformer. The result is one of the most transparent EQs in the IGS catalogue – there is no warmth or colouration added by the signal path, only the correction chosen by the engineer. This gives the iQ505 two distinct use cases: precise corrective work including notching and room resonance elimination, and subtle broad-band tonal shaping on tracks and groups where transformer character would compete with the source rather than serve it.\u003c\/p\u003e\n\n\u003ch3\u003eKEY FEATURES\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e5-band fully parametric equalizer, API 500 format, mono (Sontec MEP-250A style)\u003c\/li\u003e\n\u003cli\u003eOverlapping frequency bands – two bands can operate in the same frequency region simultaneously\u003c\/li\u003e\n\u003cli\u003eIndividual Q control per band: 0.5–10\u003c\/li\u003e\n\u003cli\u003eCorrection range: ±12 dB per band\u003c\/li\u003e\n\u003cli\u003eFrequency range: 10 Hz – 24 kHz\u003c\/li\u003e\n\u003cli\u003eTHAT chips – electronically balanced I\/O, low THD and self-noise\u003c\/li\u003e\n\u003cli\u003eNo transformers – transparent, tonally neutral signal path\u003c\/li\u003e\n\u003cli\u003eHard-wire bypass\u003c\/li\u003e\n\u003cli\u003e3-year manufacturer warranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eTECHNICAL SPECIFICATIONS\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eType: fully parametric 5-band equalizer, API 500, mono\u003c\/li\u003e\n\u003cli\u003eTopology: Sontec MEP-250A style\u003c\/li\u003e\n\u003cli\u003eNumber of bands: 5 (overlapping frequency ranges)\u003c\/li\u003e\n\u003cli\u003eCorrection range: ±12 dB\u003c\/li\u003e\n\u003cli\u003eQ: 0.5–10 (each band independently)\u003c\/li\u003e\n\u003cli\u003eFrequency range: 10 Hz – 24 kHz\u003c\/li\u003e\n\u003cli\u003eActive components: THAT chips\u003c\/li\u003e\n\u003cli\u003eInput\/output: electronically balanced\u003c\/li\u003e\n\u003cli\u003eHard-wire bypass: yes\u003c\/li\u003e\n\u003cli\u003eCurrent consumption: 100 mA\u003c\/li\u003e\n\u003cli\u003eWarranty: 3 years\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e","brand":"IGS Audio","offers":[{"title":"Default Title","offer_id":54001636016465,"sku":"47381","price":625.0,"currency_code":"EUR","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0729\/8741\/0769\/files\/IGSAudioiQ5051.jpg?v=1781176133"},{"product_id":"igs-audio-alter-500","title":"IGS Audio Alter 500","description":"\u003cdiv lang=\"en\"\u003e\n\u003cstrong\u003eIGS Audio Alter 500\u003c\/strong\u003e\n\n\u003cp\u003eThe Alter 500 is a single-channel FET compressor in API 500 format, built by IGS Audio on the UREI 1176 topology from the 1970s. A field-effect transistor as the gain-control element gives the Alter the characteristic speed and aggression of attack not achievable with opto or VCA designs. The input is electronically balanced via a modern low-noise op-amp; the output runs through a Carnhill transformer at 600 ohms. The signal path uses two discrete amplification stages built on 990-type circuits (discrete, API-compatible), with the output control placed between them. Gain reduction metering runs across a 20- or 30-point LED bar. Relay bypass on the front panel. Gain up to 36–40 dB, THD up to 0.2%, SNR above 99 dB, frequency response ±0.1 dB across 20 Hz – 20 kHz.\u003c\/p\u003e\n\n\u003ch3\u003eSix ratio positions and SLAM mode – what they add in practice\u003c\/h3\u003e\n\u003cp\u003eThe original UREI 1176 provided four ratio positions: 4:1, 8:1, 12:1, and 20:1. The Alter 500 extends this range with two additional positions: 1:1 (linear amplifier – signal passes through the FET circuit colour without compression) and 2:1 (light compression on dynamic material). Six ratio positions total cover the range from transparent tonal shaping through standard tracking compression to aggressive limiting. SLAM mode activates the equivalent of the 1176's \"all-buttons-in\" trick – simultaneously engaging all ratio buttons on the original hardware produced a non-standard, heavily coloured mode particularly valued on drums and bass. On the Alter 500, SLAM is an independent switch that operates regardless of the ratio position, allowing this character to be engaged at any point in the session without changing ratio.\u003c\/p\u003e\n\n\u003ch3\u003eAttack, release and gain staging with stepped controls\u003c\/h3\u003e\n\u003cp\u003eAttack time is selected across three positions: 0.02 ms (Fast – full transient control on drums and percussion), 0.2 ms (Mid), and 0.8 ms (Slow – lets transients pass, compresses the sustain). Release time covers 50 ms (Fast), 600 ms (Mid), and 1.1–1.5 s (Slow). Stepped input and output controls ensure full gain-staging recall between sessions. Maximum gain reduction is 20 dB. The signal routing Input → FET (GR) → Amp Stage 1 → Output → Amp Stage 2 → Carnhill mirrors the 1176 topology directly: the Output control is not a post-amplification attenuator but an active element that sets the operating point of the second gain stage, which is why its position affects both level and compression character.\u003c\/p\u003e\n\n\u003ch3\u003eKEY FEATURES\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eFET compressor 1176-style, API 500 format, mono\u003c\/li\u003e\n\u003cli\u003eTwo discrete gain stages based on 990-type circuits (API-compatible)\u003c\/li\u003e\n\u003cli\u003eInput: modern low-noise op-amp (balanced)\u003c\/li\u003e\n\u003cli\u003eOutput: Carnhill transformer, 600 Ω\u003c\/li\u003e\n\u003cli\u003e6 ratio positions: 1:1 \/ 2:1 \/ 4:1 \/ 8:1 \/ 12:1 \/ 20:1\u003c\/li\u003e\n\u003cli\u003eSLAM mode – all-buttons-in equivalent, independent of ratio switch\u003c\/li\u003e\n\u003cli\u003eAttack (3 positions): 0.02 \/ 0.2 \/ 0.8 ms\u003c\/li\u003e\n\u003cli\u003eRelease (3 positions): 50 ms \/ 600 ms \/ 1.1–1.5 s\u003c\/li\u003e\n\u003cli\u003eStepped input and output controls\u003c\/li\u003e\n\u003cli\u003eGR metering: LED bar (20–30 points)\u003c\/li\u003e\n\u003cli\u003eRelay bypass\u003c\/li\u003e\n\u003cli\u003e3-year manufacturer warranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eTECHNICAL SPECIFICATIONS\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eType: FET compressor\/limiter (1176-style), API 500, mono\u003c\/li\u003e\n\u003cli\u003eGain control element: FET (field-effect transistor)\u003c\/li\u003e\n\u003cli\u003eAmplification stages: 2× discrete, 990-type circuit\u003c\/li\u003e\n\u003cli\u003eInput: balanced, modern low-noise op-amp\u003c\/li\u003e\n\u003cli\u003eOutput: Carnhill, 600 Ω\u003c\/li\u003e\n\u003cli\u003eInput impedance: 1 kΩ\u003c\/li\u003e\n\u003cli\u003eOutput impedance: 600 Ω (Carnhill)\u003c\/li\u003e\n\u003cli\u003eRatio: 1:1 \/ 2:1 \/ 4:1 \/ 8:1 \/ 12:1 \/ 20:1\u003c\/li\u003e\n\u003cli\u003eAttack: 0.02 \/ 0.2 \/ 0.8 ms\u003c\/li\u003e\n\u003cli\u003eRelease: 50 ms \/ 600 ms \/ 1.1–1.5 s\u003c\/li\u003e\n\u003cli\u003eMaximum gain: 36–40 dB\u003c\/li\u003e\n\u003cli\u003eMaximum gain reduction: 20 dB\u003c\/li\u003e\n\u003cli\u003eMaximum input level: +20 dBu\u003c\/li\u003e\n\u003cli\u003eMaximum output level: +22 dBm\u003c\/li\u003e\n\u003cli\u003eTHD: up to 0.2%\u003c\/li\u003e\n\u003cli\u003eFrequency response: ±0.1 dB, 20 Hz – 20 kHz\u003c\/li\u003e\n\u003cli\u003eSNR: above 99 dB\u003c\/li\u003e\n\u003cli\u003ePower supply: ±16 V\u003c\/li\u003e\n\u003cli\u003eDimensions (H×W×D): 132×37×158 mm\u003c\/li\u003e\n\u003cli\u003eWeight: 700 g\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e","brand":"IGS Audio","offers":[{"title":"Default Title","offer_id":54001636049233,"sku":"47382","price":725.0,"currency_code":"EUR","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0729\/8741\/0769\/files\/IGSAudioAlter5001.jpg?v=1781176116"},{"product_id":"igs-audio-pure-tube-channel","title":"IGS Audio Pure Tube Channel","description":"\u003cdiv lang=\"en\"\u003e\n\u003cstrong\u003eIGS Audio Pure Tube Channel\u003c\/strong\u003e\n\n\u003cp\u003eThe Pure Tube Channel (PTC) is a single-channel Class A tube microphone preamplifier in a desktop\/rackmount enclosure, built by IGS Audio around a minimalist signal path philosophy: Carnhill input transformer, two Class A military-grade tubes (6N2P-EW and 6N1P-EW), Edcor output transformer – and only two Mundorf capacitors in the entire audio path. Every passive component in a signal chain is a compromise; the PTC rejects that compromise by constructing the path with the absolute minimum of elements. Two XLR connectors on the rear panel (input and output) are joined by direct access to the tube sockets from the back of the enclosure without disassembly – facilitating tube rolling from the engineer's custom set that IGS Audio offers for the unit: 6N2P, 6N1P, 6B23P, 6BC8, 6BZ8. Maximum gain: 65 dB, SNR: –110 dB.\u003c\/p\u003e\n\n\u003ch3\u003eSignal path architecture – why every component choice matters\u003c\/h3\u003e\n\u003cp\u003eThe PTC signal path follows a strict minimum-component philosophy: the Carnhill input transformer provides galvanic isolation and balanced input, the first 6N2P-EW double-triode (Class A) forms the voltage gain stage, the second 6N1P-EW double-triode (Class A) brings the signal to line level, and the Edcor output transformer delivers a balanced 600-ohm output to the next device in the chain. Two Mundorf capacitors are the only capacitive elements in the audio path – chosen for low ESR, thermal stability, and minimal phase influence. The absence of correction capacitors and surplus passive elements means every amplification stage operates with the full, uncorrected character of the tube, without tonal correction built into the circuit.\u003c\/p\u003e\n\n\u003ch3\u003eHi-Z input and gain control\u003c\/h3\u003e\n\u003cp\u003eThe Hi-Z input (1 MΩ) routes the guitar or bass signal directly to the first tube grid without an active buffer – in practice this means the electric instrument has a direct electrical relationship with the first triode and its saturation characteristics. The resulting character is not available in preamps with a buffered instrument input. Gain is controlled via a 6-step Gain switch and a 41-click Trim, providing the precision of 500-series module switching in a standalone desktop format. A –20 dB pad and +48V phantom power complete the feature set. Balanced microphone input impedance is 300\/1200 Ω (selectable via the Carnhill transformer). Maximum input level +18 dBu, maximum output level +22 dBu.\u003c\/p\u003e\n\n\u003ch3\u003eKEY FEATURES\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eFully tube Mic\/Hi-Z preamplifier, Class A, single channel\u003c\/li\u003e\n\u003cli\u003eMinimalist path: input transformer + 2 tubes + output transformer + 2 Mundorf capacitors\u003c\/li\u003e\n\u003cli\u003eTubes: 6N2P-EW + 6N1P-EW (military-grade, Class A)\u003c\/li\u003e\n\u003cli\u003eInput transformer: Carnhill (balanced, 300\/1200 Ω)\u003c\/li\u003e\n\u003cli\u003eOutput transformer: Edcor (balanced, 600 Ω)\u003c\/li\u003e\n\u003cli\u003eOnly 2 Mundorf capacitors in the signal path\u003c\/li\u003e\n\u003cli\u003eGain control: 6-step Gain switch + 41-click Trim\u003c\/li\u003e\n\u003cli\u003eHi-Z input: 1 MΩ, signal direct to tube grid\u003c\/li\u003e\n\u003cli\u003ePad –20 dB, phantom power +48V\u003c\/li\u003e\n\u003cli\u003eEngineer's alternative tube set available: 6N2P, 6N1P, 6B23P, 6BC8, 6BZ8\u003c\/li\u003e\n\u003cli\u003eDirect rear-panel tube socket access without disassembly\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eTECHNICAL SPECIFICATIONS\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eType: tube mic\/instrument preamplifier, Class A, mono\u003c\/li\u003e\n\u003cli\u003eTubes: 6N2P-EW + 6N1P-EW (military-grade)\u003c\/li\u003e\n\u003cli\u003eInput transformer: Carnhill (300\/1200 Ω)\u003c\/li\u003e\n\u003cli\u003eOutput transformer: Edcor (600 Ω)\u003c\/li\u003e\n\u003cli\u003eCapacitors in signal path: 2× Mundorf\u003c\/li\u003e\n\u003cli\u003eInput impedance (balanced): 300\/1200 Ω (Carnhill)\u003c\/li\u003e\n\u003cli\u003eHi-Z impedance: 1 MΩ\u003c\/li\u003e\n\u003cli\u003eOutput impedance: 600 Ω (Edcor)\u003c\/li\u003e\n\u003cli\u003eMaximum gain: +65 dB (6-step Gain + 41-click Trim)\u003c\/li\u003e\n\u003cli\u003ePad: –20 dB\u003c\/li\u003e\n\u003cli\u003ePhantom power: +48V\u003c\/li\u003e\n\u003cli\u003eOperating level: +4 dBu\u003c\/li\u003e\n\u003cli\u003eMaximum input level: +18 dBu\u003c\/li\u003e\n\u003cli\u003eMaximum output level: +22 dBu\u003c\/li\u003e\n\u003cli\u003eSNR: –110 dB\u003c\/li\u003e\n\u003cli\u003eConnectors: 2× XLR (rear), Hi-Z jack (front)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e","brand":"IGS Audio","offers":[{"title":"Default Title","offer_id":54001636180305,"sku":"51149","price":950.0,"currency_code":"EUR","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0729\/8741\/0769\/files\/IGSAudioPureTubeChannel1.jpg?v=1781176102"},{"product_id":"igs-audio-572-red-stripe","title":"IGS Audio 572 Red Stripe","description":"\u003cdiv lang=\"en\"\u003e\n\u003cstrong\u003eIGS Audio 572 Red Stripe\u003c\/strong\u003e\n\n\u003cp\u003eThe 572 Red Stripe is a tube microphone and instrument preamplifier in API 500 format, designed by IGS Audio on the topology of the Telefunken V72 – one of the most sought-after tube preamplifiers in the history of professional recording. The signal path is fully tube-based: two double-triode valves, JJ ECC803S and JJ ECC81, form a two-stage amplification circuit. The input is transformer-balanced via a Sowter transformer (UK-made); the output runs through an Edcor transformer (USA-made). All front-panel controls are stepped switches throughout – a 41-position gain switch provides precision not available on potentiometers. A backlit analog VU meter with dedicated +48V and CLIP LEDs completes the front panel. Three-year manufacturer warranty.\u003c\/p\u003e\n\n\u003ch3\u003eSecond-stage saturation – where the Red Stripe character becomes audible\u003c\/h3\u003e\n\u003cp\u003eThe 572 Red Stripe operates linearly and transparently at low and moderate gain settings. Its character becomes apparent as the second tube stage enters saturation – harmonic enrichment takes on a distinct tonal quality particularly valued on acoustic guitar, vocals, percussion, and any source that benefits from gentle harmonic compression and a subtle midrange presence lift. The 41-position gain switch (up to 64 dB total) allows precise placement in the saturation zone without the imprecision of a potentiometer. The Hi-Z input (1 MΩ, ¼\" TS jack on the front panel) routes guitar or bass directly to the first tube grid without an active buffer stage, giving full access to the tube circuit character from the first stage of amplification.\u003c\/p\u003e\n\n\u003ch3\u003eInterstage pad and HPF – control without bypassing the colour\u003c\/h3\u003e\n\u003cp\u003eThe –20 dB pad operates between the two amplification stages (interstage) rather than at the module input – meaning it attenuates the signal after it has passed through the Sowter input transformer and the first triode, before reaching the second gain stage. The result is that the colour of the input transformer and first valve is preserved while the level feeding the second stage is controlled. The highpass filter at 6 dB\/oct with OFF\/50 Hz steps removes low-frequency content without a separate filter module in the chain. Phase reverse switch, +48V phantom power, and a choice between XLR input (rear) and Hi-Z (front panel) complete the feature set. Maximum input level: +16 dBu; maximum output level: +28 dBu; dynamic range: 117 dB; SNR: –100 dBA.\u003c\/p\u003e\n\n\u003ch3\u003eKEY FEATURES\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eTube Mic\/Line\/Hi-Z preamplifier, API 500 format, mono (1 slot)\u003c\/li\u003e\n\u003cli\u003eInspired by the Telefunken V72 topology\u003c\/li\u003e\n\u003cli\u003eTubes: JJ ECC803S + JJ ECC81 (two double-triodes)\u003c\/li\u003e\n\u003cli\u003eInput transformer: Sowter (United Kingdom)\u003c\/li\u003e\n\u003cli\u003eOutput transformer: Edcor (United States)\u003c\/li\u003e\n\u003cli\u003e41-position gain switch (up to 64 dB)\u003c\/li\u003e\n\u003cli\u003e–20 dB interstage pad\u003c\/li\u003e\n\u003cli\u003eHPF: OFF \/ 50 Hz (6 dB\/oct)\u003c\/li\u003e\n\u003cli\u003eHi-Z DI: ¼\" TS jack, 1 MΩ (front panel)\u003c\/li\u003e\n\u003cli\u003eBacklit analog VU meter + dedicated +48V and CLIP LEDs\u003c\/li\u003e\n\u003cli\u003ePhantom power +48V, polarity reverse switch\u003c\/li\u003e\n\u003cli\u003e3-year manufacturer warranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eTECHNICAL SPECIFICATIONS\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eType: tube Mic\/Line\/Hi-Z preamplifier, API 500, mono\u003c\/li\u003e\n\u003cli\u003eSlots: 1\u003c\/li\u003e\n\u003cli\u003eTubes: 2× double-triode (JJ ECC803S + JJ ECC81)\u003c\/li\u003e\n\u003cli\u003eInput transformer: Sowter (balanced)\u003c\/li\u003e\n\u003cli\u003eOutput transformer: Edcor (balanced)\u003c\/li\u003e\n\u003cli\u003eInput impedance: above 1.2 kΩ (balanced)\u003c\/li\u003e\n\u003cli\u003eOutput impedance: 600 Ω (balanced)\u003c\/li\u003e\n\u003cli\u003eHi-Z impedance: 1 MΩ\u003c\/li\u003e\n\u003cli\u003eGain: up to 64 dB (41 steps)\u003c\/li\u003e\n\u003cli\u003ePad: –20 dB (interstage)\u003c\/li\u003e\n\u003cli\u003eHPF: OFF \/ 50 Hz (6 dB\/oct)\u003c\/li\u003e\n\u003cli\u003eMaximum input level: +16 dBu\u003c\/li\u003e\n\u003cli\u003eMaximum output level: +28 dBu\u003c\/li\u003e\n\u003cli\u003eDynamic range: 117 dB\u003c\/li\u003e\n\u003cli\u003eSNR: –100 dBA\u003c\/li\u003e\n\u003cli\u003eTHD+N: max. 0.5%\u003c\/li\u003e\n\u003cli\u003eFrequency response: 20 Hz – 20 kHz (–1 dB)\u003c\/li\u003e\n\u003cli\u003ePhantom power: +48V\u003c\/li\u003e\n\u003cli\u003ePower supply: ±16 V DC\u003c\/li\u003e\n\u003cli\u003ePower consumption: 6.5 W\u003c\/li\u003e\n\u003cli\u003eDimensions: 78×166×229 mm\u003c\/li\u003e\n\u003cli\u003eShipping weight: 2 kg\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e","brand":"IGS Audio","offers":[{"title":"Default Title","offer_id":54001637818705,"sku":"51153","price":895.0,"currency_code":"EUR","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0729\/8741\/0769\/files\/IGSAudio572RedStripe1.jpg?v=1781176089"},{"product_id":"igs-audio-bison-500","title":"IGS Audio BISON 500","description":"\u003cdiv lang=\"en\"\u003e\n\u003cstrong\u003eIGS Audio BISON 500\u003c\/strong\u003e\n\n\u003cp\u003eThe BISON 500 is a stereo M\/S matrix with a parallel dry\/wet mixer in API 500 format, built by IGS Audio as a routing tool that extends the capabilities of any existing dual-mono or two mono compressors and equalizers. The BISON itself does not process audio – its function is to encode a stereo L\/R signal into Mid\/Side before external processors, and decode it back to stereo L\/R on the return, with a Mix knob blending the processed signal against the dry input. Two stereo TRS jack connectors on the front panel serve as send and return for external inserts, a three-position toggle switch selects the operating mode, and a large Mix knob controls the parallel blend. Electrical performance: THD+N 0.001% at 0 dBu, dynamic range 100 dB, SNR –99 dBA, frequency response 20 Hz – 20 kHz ±0.1 dB.\u003c\/p\u003e\n\n\u003ch3\u003eM\/S mode – how BISON 500 splits and reconstructs the stereo image\u003c\/h3\u003e\n\u003cp\u003eIn M\/S mode the module performs a complete analog encode and decode matrix in the signal path. The left insert channel carries the Mid signal (L+R sum – the centre of the stereo image), the right channel carries the Side signal (L–R difference – the stereo width information). A compressor patched into the left channel compresses only the centre – affecting vocals, bass, and central elements without touching the sides. A compressor on the right channel compresses only the sides – reducing or expanding stereo width independently of the centre. Two different processors can be used simultaneously: one compressor on Mid, a different one on Side, or an equalizer on one channel with no effect on the other. After the inserts BISON decodes the M\/S matrix back to stereo L\/R before the output.\u003c\/p\u003e\n\n\u003ch3\u003eParallel and Stereo – the two remaining operating modes\u003c\/h3\u003e\n\u003cp\u003eParallel mode routes the signal through the external processors and blends the result with the dry input using the Mix knob – without building a separate parallel chain on the console or in the DAW. Heavy compression at 100% wet delivers pump and density; pulling the Mix back to 30–40% restores the natural dynamic envelope while retaining the colour and weight the processor contributes. Stereo mode passes the signal through the inserts without M\/S encoding – the BISON functions as a simple stereo insert send\/return with a parallel blender. A 5-point LED VU display monitors signal level. Input impedance 2 kΩ, output impedance 600 Ω, maximum input level +22 dBu, maximum output level +22 dBu, power consumption 8 W.\u003c\/p\u003e\n\n\u003ch3\u003eKEY FEATURES\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eStereo M\/S matrix + parallel mixer, API 500 format\u003c\/li\u003e\n\u003cli\u003eTwo stereo TRS jack connectors on the front panel (send + return)\u003c\/li\u003e\n\u003cli\u003eThree-position mode switch: M\/S \/ Parallel \/ Stereo\u003c\/li\u003e\n\u003cli\u003eMix knob – continuous dry\/wet blend\u003c\/li\u003e\n\u003cli\u003eFully analog M\/S matrix, encode and decode in the signal path\u003c\/li\u003e\n\u003cli\u003eIndependent Mid and Side processing via external processors\u003c\/li\u003e\n\u003cli\u003eVU metering: 5-point LED\u003c\/li\u003e\n\u003cli\u003eTHD+N: 0.001% at 0 dBu\u003c\/li\u003e\n\u003cli\u003eDynamic range: 100 dB\u003c\/li\u003e\n\u003cli\u003eStereo Link: yes\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eTECHNICAL SPECIFICATIONS\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eType: stereo M\/S processor + parallel mixer, API 500\u003c\/li\u003e\n\u003cli\u003eOperating modes: M\/S \/ Parallel (Dry\/Wet) \/ Stereo\u003c\/li\u003e\n\u003cli\u003eInserts: 2× stereo TRS jack (send + return, front panel)\u003c\/li\u003e\n\u003cli\u003eInput impedance: 2 kΩ (balanced)\u003c\/li\u003e\n\u003cli\u003eOutput impedance: 600 Ω (balanced)\u003c\/li\u003e\n\u003cli\u003eOperating level: +4 dBu\u003c\/li\u003e\n\u003cli\u003eMaximum input level: +22 dBu\u003c\/li\u003e\n\u003cli\u003eMaximum output level: +22 dBu\u003c\/li\u003e\n\u003cli\u003eDynamic range: 100 dB\u003c\/li\u003e\n\u003cli\u003eSNR: –99 dBA\u003c\/li\u003e\n\u003cli\u003eTHD+N: 0.001% (0 dBu)\u003c\/li\u003e\n\u003cli\u003eFrequency response: 20 Hz – 20 kHz ±0.1 dB\u003c\/li\u003e\n\u003cli\u003eMetering: VU, 5-point LED\u003c\/li\u003e\n\u003cli\u003eStereo Link: yes\u003c\/li\u003e\n\u003cli\u003ePower consumption: 8 W\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e","brand":"IGS Audio","offers":[{"title":"Default Title","offer_id":54001639719249,"sku":"51148","price":725.0,"currency_code":"EUR","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0729\/8741\/0769\/files\/IGSAudioBISON500.jpg?v=1781176073"},{"product_id":"igs-audio-photon-500","title":"IGS Audio Photon 500","description":"\u003cdiv lang=\"en\"\u003e\n\u003cstrong\u003eIGS Audio Photon 500\u003c\/strong\u003e\n\n\u003cp\u003eThe Photon 500 is an optical compressor\/limiter in API 500 format, built by IGS Audio on the classic opto-electronic topology first used in the LA-2A limiter and later in the LA-4. The compression element is an opto-coupler that introduces negative feedback into the audio path – this is the mechanism that gives opto compressors their characteristically smooth and musical response, different in speed and character from VCA or VCR designs. The input is electronically balanced with an API 2520-compatible op-amp in the gain stage; the output runs through a Carnhill transformer at 600 ohms. All front-panel controls are switches or stepped selectors – the 12-pole stepped Output knob for makeup gain ensures full session recall without relying on unmarked pot positions. Three-year manufacturer warranty.\u003c\/p\u003e\n\n\u003ch3\u003eLondon \/ New York – two compression characters from one module\u003c\/h3\u003e\n\u003cp\u003eThe London\/New York switch is the key differentiator between the Photon 500 and simpler opto clones. London mode models a smooth, gentle compression curve with a slower envelope response – analogous to an LA-2A working on a vocal, acoustic guitar, or full mix where the compressor coheres the material without audible pumping. New York mode activates a more aggressive curve shaping, closer to using compression as an effect: pronounced gain reduction, more evident transient shaping, more audible action on drums, bass, or electric guitar. The side-chain highpass filter at Flat\/60\/120 Hz prevents low-frequency content from triggering unintended compression – particularly useful on bass-heavy tracks, drum buses, or mix groups where sub-bass energy would otherwise drive the detector continuously.\u003c\/p\u003e\n\n\u003ch3\u003eRatio and gain staging – flexibility without panel complexity\u003c\/h3\u003e\n\u003cp\u003eThree ratio positions – 2:1, 4:1, and 12:1 – cover the range from transparent dynamic cohesion (2:1 on vocals or piano) through standard tracking compression (4:1 on instruments and groups) to near-limiting behaviour (12:1 on kick drum or as a safety limiter on a mix bus). The Peak Reduction knob controls the gain of the side-chain detection circuit, which translates directly to the depth of gain reduction – maximum GR is 20 dB. The 12-pole stepped Output handles makeup gain with full repeatability. Maximum gain is 30 dB; maximum input level +24 dBu, output +32 dBu; THD up to 0.5%; frequency response ±0.2 dB across 8 Hz – 20 kHz.\u003c\/p\u003e\n\n\u003ch3\u003eKEY FEATURES\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eOptical compressor\/limiter (opto-coupler), API 500 format, mono\u003c\/li\u003e\n\u003cli\u003eInspired by LA-2A and LA-4, negative feedback via opto-coupler topology\u003c\/li\u003e\n\u003cli\u003eElectronically balanced input with API 2520-compatible op-amp\u003c\/li\u003e\n\u003cli\u003eCarnhill transformer output, 600 Ω\u003c\/li\u003e\n\u003cli\u003eLondon mode (smooth compression) \/ New York mode (aggressive curve)\u003c\/li\u003e\n\u003cli\u003eRatio: 2:1 \/ 4:1 \/ 12:1\u003c\/li\u003e\n\u003cli\u003eSide-chain HPF: Flat \/ 60 \/ 120 Hz\u003c\/li\u003e\n\u003cli\u003eOutput: 12-pole stepped makeup gain\u003c\/li\u003e\n\u003cli\u003eMaximum gain reduction: 20 dB\u003c\/li\u003e\n\u003cli\u003eHard-wire bypass\u003c\/li\u003e\n\u003cli\u003e3-year manufacturer warranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eTECHNICAL SPECIFICATIONS\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eType: optical compressor\/limiter, API 500, mono\u003c\/li\u003e\n\u003cli\u003eCompression element: opto-coupler\u003c\/li\u003e\n\u003cli\u003eInput: electronically balanced, API 2520-compatible op-amp\u003c\/li\u003e\n\u003cli\u003eOutput: Carnhill transformer, 600 Ω\u003c\/li\u003e\n\u003cli\u003eInput impedance: 10 kΩ\u003c\/li\u003e\n\u003cli\u003eOutput impedance: 600 Ω (Carnhill)\u003c\/li\u003e\n\u003cli\u003eRatio: 2:1 \/ 4:1 \/ 12:1\u003c\/li\u003e\n\u003cli\u003eSide-chain HPF: Flat \/ 60 Hz \/ 120 Hz\u003c\/li\u003e\n\u003cli\u003eMaximum gain: 30 dB\u003c\/li\u003e\n\u003cli\u003eMaximum gain reduction: 20 dB\u003c\/li\u003e\n\u003cli\u003eMaximum input level: +24 dBu\u003c\/li\u003e\n\u003cli\u003eMaximum output level: +32 dBu\u003c\/li\u003e\n\u003cli\u003eTHD: max. 0.5%\u003c\/li\u003e\n\u003cli\u003eFrequency response: ±0.2 dB, 8 Hz – 20 kHz\u003c\/li\u003e\n\u003cli\u003eSNR: above 99 dB\u003c\/li\u003e\n\u003cli\u003eOperating level: +4 dBu\u003c\/li\u003e\n\u003cli\u003ePower supply: ±16 V\u003c\/li\u003e\n\u003cli\u003eCurrent consumption: 110 mA\u003c\/li\u003e\n\u003cli\u003eDimensions (H×W×D): 133×37×180 mm\u003c\/li\u003e\n\u003cli\u003eWeight: 700 g\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e","brand":"IGS Audio","offers":[{"title":"Default Title","offer_id":54001639752017,"sku":"51151","price":755.0,"currency_code":"EUR","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0729\/8741\/0769\/files\/IGSAudioPhoton5001.jpg?v=1781176057"},{"product_id":"igs-audio-rb-500","title":"IGS Audio RB 500","description":"\u003cdiv lang=\"en\"\u003e\n\u003cstrong\u003eIGS Audio RB 500\u003c\/strong\u003e\n\n\u003cp\u003eThe RB 500 (Rubber Bands 500) is a passive equalizer in API 500 format, built by IGS Audio on the Pultec EQP-1A topology from the 1960s. Carnhill transformers on input and output balance the signal path and contribute the tonal colour associated with the British transformer school. The filtering section is fully passive – no active elements in the correction path means EQ curves with natural rounding and none of the artefacts of active or digital equalization. A discrete driver circuit recovers the gain lost in the passive network and delivers the signal to the output at 600 ohms impedance. Hard-wire relay bypass enables clean A\/B comparison with the unprocessed signal. Frequency response: 5 Hz – 20 kHz ±0.1 dB, THD up to 0.1%, SNR above 99 dB.\u003c\/p\u003e\n\n\u003ch3\u003eThree sections – how they work independently and together\u003c\/h3\u003e\n\u003cp\u003eThe RB 500 front panel provides two high-frequency sections and one low-frequency section, following the Pultec EQP-1A layout. The HB (High Boost) section offers frequency selection across 5, 6, 10, 12, and 16 kHz with continuous gain control and a Q selector. The HC (High Cut) section operates at 6, 10, and 20 kHz. Passive high-frequency correction in the Pultec style is asymmetric in the boost\/cut relationship: boosting and cutting at the same frequency do not cancel each other linearly, which allows the simultaneous use of both to produce a shelf curve with an accentuated leading edge – a technique used on mix buses and mastering chains to open the top end without brightness fatigue. The low-frequency BBC section covers 20, 40, 60, 100, 180, and 240 Hz – the name references BBC console EQ curves that operated across a similar range. Correction range reaches ±15 dB with Q adjustable from 0.5 to 4.\u003c\/p\u003e\n\n\u003ch3\u003eWhere passive Pultec-style EQ has an advantage over active correction\u003c\/h3\u003e\n\u003cp\u003ePassive Pultec correction on individual tracks and groups behaves differently from active EQ at equivalent nominal gain settings: the curve is wider at the base and narrows naturally toward the peak, meaning a boost at 10–16 kHz adds air without hardness, and a low-end boost at 40–60 Hz adds body without mud. The independent frequency selectors for the boost and cut sections in the low band – operating separately from each other – are the key differentiator from simplified clones: boosting at 20 Hz and cutting at 100 Hz simultaneously gives precise control over the bass silhouette without affecting the fundamental low-end floor. Maximum input level +20 dBu, output +22 dBu, power supply ±16 V, current draw 70 mA, weight 900 g.\u003c\/p\u003e\n\n\u003ch3\u003eKEY FEATURES\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003ePassive Pultec-style equalizer, API 500 format, mono\u003c\/li\u003e\n\u003cli\u003eCarnhill transformers on input and output\u003c\/li\u003e\n\u003cli\u003eDiscrete driver circuit – recovers passive network insertion loss\u003c\/li\u003e\n\u003cli\u003eHB (High Boost) section: 5 \/ 6 \/ 10 \/ 12 \/ 16 kHz with Q control\u003c\/li\u003e\n\u003cli\u003eHC (High Cut) section: 6 \/ 10 \/ 20 kHz\u003c\/li\u003e\n\u003cli\u003eBBC (Low Boost\/Cut) section: 20 \/ 40 \/ 60 \/ 100 \/ 180 \/ 240 Hz\u003c\/li\u003e\n\u003cli\u003eIndependent frequency selectors for low-band boost and cut\u003c\/li\u003e\n\u003cli\u003eCorrection range: ±15 dB\u003c\/li\u003e\n\u003cli\u003eQ: 0.5–4 (adjustable)\u003c\/li\u003e\n\u003cli\u003eHard-wire relay bypass\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eTECHNICAL SPECIFICATIONS\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eType: passive band equalizer (Pultec EQP-1A style), API 500, mono\u003c\/li\u003e\n\u003cli\u003eTransformers: Carnhill (input and output)\u003c\/li\u003e\n\u003cli\u003eInput impedance: 1 kΩ (balanced, Carnhill)\u003c\/li\u003e\n\u003cli\u003eOutput impedance: 600 Ω (balanced, Carnhill)\u003c\/li\u003e\n\u003cli\u003eCorrection range: ±15 dB\u003c\/li\u003e\n\u003cli\u003eQ: 0.5–4\u003c\/li\u003e\n\u003cli\u003eFrequency response: 5 Hz – 20 kHz ±0.1 dB\u003c\/li\u003e\n\u003cli\u003eTHD: up to 0.1%\u003c\/li\u003e\n\u003cli\u003eSNR: above 99 dB\u003c\/li\u003e\n\u003cli\u003eOperating level: +4 dBu\u003c\/li\u003e\n\u003cli\u003eMaximum input level: +20 dBu\u003c\/li\u003e\n\u003cli\u003eMaximum output level: +22 dBu\u003c\/li\u003e\n\u003cli\u003eBypass: hard-wire (relay)\u003c\/li\u003e\n\u003cli\u003ePower supply: ±16 V\u003c\/li\u003e\n\u003cli\u003eCurrent consumption: 70 mA\u003c\/li\u003e\n\u003cli\u003ePower consumption: 3.5 W\u003c\/li\u003e\n\u003cli\u003eWeight: 900 g\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e","brand":"IGS Audio","offers":[{"title":"Default Title","offer_id":54001639784785,"sku":"51150","price":725.0,"currency_code":"EUR","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0729\/8741\/0769\/files\/IGSAudioRB5001.jpg?v=1781176041"},{"product_id":"igs-audio-vanad-500","title":"IGS Audio Vanad 500","description":"\u003cdiv lang=\"en\"\u003e\n\u003cstrong\u003eIGS Audio Vanad 500\u003c\/strong\u003e\n\n\u003cp\u003eThe Vanad 500 is a microphone, line, and instrument preamplifier in API 500 format, built by IGS Audio with Carnhill transformers on both input and output. Carnhill is a British transformer manufacturer closely associated with the tonal character of classic Neve consoles – their use in a 500-series module delivers the warm, dense colour and saturation behaviour of that lineage in a single rack slot. All front-panel controls are stepped switches, ensuring full session recall without relying on marked positions or photographs. Total available gain reaches 60 dB, with 3 dB resolution on both IN and OUT switches providing precise control over the gain staging relationship: the input stage and Carnhill transformer can be driven deliberately while the output attenuator keeps the level feeding the next device in the chain under control.\u003c\/p\u003e\n\n\u003ch3\u003eThree source types from one module\u003c\/h3\u003e\n\u003cp\u003eThe Vanad 500 handles dynamic, condenser, and ribbon microphones via the XLR input (accessible from the rear panel and the front panel), line-level signals from keyboards or outboard processors through the same XLR path, and guitars and basses directly through the Hi-Z input on the front panel. The Hi-Z input routes the instrument signal directly to the input grid without an active buffer stage, which at appropriate gain settings gives access to the Carnhill transformer saturation character using electric guitar or bass as the source. The 6 dB\/oct highpass filter with OFF\/30\/100 Hz steps removes low-frequency rumble or mechanical noise without requiring a separate filter module downstream. Phantom power +48V covers condenser microphones; the phase reverse switch Ø operates independently of source type.\u003c\/p\u003e\n\n\u003ch3\u003eGain staging as a tool – IN and OUT as separate controls\u003c\/h3\u003e\n\u003cp\u003eSeparating the input gain control (IN: 0 dB Line to +30 dB Mic, 3 dB steps) from the output level control (OUT: 0 dB to +30 dB, 3 dB steps) allows the engineer to deliberately drive the first gain stage and the Carnhill transformer while maintaining a controlled output level feeding the rest of the chain. This is the same technique used on classic Neve-format consoles, where the first amplifier stage was intentionally operated in light saturation territory. Maximum input level for line signals is +20 dBu; maximum output level is +22 dBm. THD up to 0.2% – in the context of a transformer-based preamp with this lineage, that figure reflects the intended tonal character rather than a limitation. SNR exceeds 99 dB with frequency response held to ±0.1 dB across 20 Hz – 20 kHz.\u003c\/p\u003e\n\n\u003ch3\u003eKEY FEATURES\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eMic\/Line\/Hi-Z preamplifier, API 500 format, mono\u003c\/li\u003e\n\u003cli\u003eCarnhill transformers on input and output – fully balanced signal path\u003c\/li\u003e\n\u003cli\u003eAll controls as stepped switches (3 dB per step)\u003c\/li\u003e\n\u003cli\u003eSeparate IN (0 to +30 dB) and OUT (0 to +30 dB) switches – flexible gain staging\u003c\/li\u003e\n\u003cli\u003eHi-Z input on the front panel for guitar and bass direct\u003c\/li\u003e\n\u003cli\u003eXLR input accessible from both rear and front panel\u003c\/li\u003e\n\u003cli\u003eHPF 6 dB\/oct: OFF \/ 30 \/ 100 Hz\u003c\/li\u003e\n\u003cli\u003ePhantom power +48V\u003c\/li\u003e\n\u003cli\u003ePhase reverse switch\u003c\/li\u003e\n\u003cli\u003eSNR: above 99 dB\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eTECHNICAL SPECIFICATIONS\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eType: microphone\/line\/Hi-Z preamplifier, API 500, mono\u003c\/li\u003e\n\u003cli\u003eTransformers: Carnhill (input and output)\u003c\/li\u003e\n\u003cli\u003eInput impedance: 1 kΩ (balanced, Carnhill)\u003c\/li\u003e\n\u003cli\u003eOutput impedance: 600 Ω (balanced, Carnhill)\u003c\/li\u003e\n\u003cli\u003eInput gain (IN): 0 dB (Line) – +30 dB (Mic), 3 dB steps\u003c\/li\u003e\n\u003cli\u003eOutput level (OUT): 0 dB – +30 dB, 3 dB steps\u003c\/li\u003e\n\u003cli\u003ePAD: -30 to 0 dB, 3 dB steps\u003c\/li\u003e\n\u003cli\u003eTotal gain: 60 dB\u003c\/li\u003e\n\u003cli\u003eMaximum input level (LINE): +20 dBu\u003c\/li\u003e\n\u003cli\u003eMaximum output level: +22 dBm\u003c\/li\u003e\n\u003cli\u003eTHD: up to 0.2%\u003c\/li\u003e\n\u003cli\u003eFrequency response: ±0.1 dB, 20 Hz – 20 kHz\u003c\/li\u003e\n\u003cli\u003eSNR: above 99 dB\u003c\/li\u003e\n\u003cli\u003eHPF: OFF \/ 30 \/ 100 Hz (6 dB\/oct)\u003c\/li\u003e\n\u003cli\u003ePhantom power: +48V\u003c\/li\u003e\n\u003cli\u003ePower supply: ±16 V\u003c\/li\u003e\n\u003cli\u003eCurrent consumption: 60 mA\u003c\/li\u003e\n\u003cli\u003eDimensions (H×W×D): 132×37×158 mm\u003c\/li\u003e\n\u003cli\u003eWeight: 900 g\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e","brand":"IGS Audio","offers":[{"title":"Default Title","offer_id":54001639817553,"sku":"51152","price":725.0,"currency_code":"EUR","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0729\/8741\/0769\/files\/IGSAudioVanad5001.jpg?v=1781176024"},{"product_id":"igs-audio-daco","title":"IGS Audio DACO","description":"\u003cdiv lang=\"en\"\u003e\n\u003cstrong\u003eIGS Audio DACO\u003c\/strong\u003e\n\n\u003cp\u003eDACO is a digital-to-analog converter with a tube output stage, designed and manufactured in Poland by IGS Audio. The digital section is built around a dual AK4493SEQ conversion chip (AKM) – among the more highly regarded DAC silicon in the hi-fi segment – managed by an AK4118 digital receiver (AKM) and a QCC5125 Bluetooth receiver (Qualcomm). After conversion, the analog signal passes into a tube output buffer built around a pair of NOS military-grade 6N6P-VI valves (alternatively 6N30P), operating without global negative feedback. The buffer is transformer-balanced at both input and output with full galvanic isolation from the output stage. All transformers are custom-designed and supplied by UTM Industry. A linear power supply with a GZ34 tube rectifier and ultra-low-noise filtering stabilises the voltage rails feeding the tube and analog stages.\u003c\/p\u003e\n\n\u003ch3\u003eDigital input architecture – what DACO accepts and at what resolution\u003c\/h3\u003e\n\u003cp\u003eDACO accommodates five types of digital input: AES\/EBU, S\/PDIF, ADAT, USB, and Bluetooth. The USB input handles PCM up to 384 kHz and DSD64, DSD128, DSD256, and DSD512 – the full range of hi-res formats available from streaming services and local digital libraries. AES\/EBU, S\/PDIF, and ADAT inputs support PCM up to 192 kHz. Bluetooth via the QCC5125 Qualcomm chip covers up to 96 kHz, which in practice handles LDAC hi-res streaming. A 2-inch OLED display on the front panel shows the active input and current sample rate; an input selector and IR receiver window add remote control operation. The 380×290 mm enclosure is machined from 3 mm aluminium CNC and weighs 6 kg.\u003c\/p\u003e\n\n\u003ch3\u003eTube output buffer and analog performance\u003c\/h3\u003e\n\u003cp\u003eThe 6N6P-VI tube is specified for exceptionally linear operation and low self-noise – in the context of a DAC output stage, this translates to wide soundstage, micro-dynamic resolution, and the absence of the flattening effect common in cheaper solid-state output stages. Designing without global NFB preserves the full sonic character of the tubes while maintaining distortion at THD below 0.03% at 1 kHz and 0 dBFS. Frequency response extends from 8 Hz to 80 kHz (±1 dB); dynamic range measures 112 dB per AES17. RCA output delivers 2.5 V RMS unbalanced; balanced XLR output provides 5 V RMS. Power consumption is 45 W.\u003c\/p\u003e\n\n\u003ch3\u003eKEY FEATURES\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eDual AK4493SEQ DAC (AKM) + AK4118 digital receiver (AKM)\u003c\/li\u003e\n\u003cli\u003eTube output buffer: 2× 6N6P-VI or 6N30P NOS military-grade\u003c\/li\u003e\n\u003cli\u003eNo global negative feedback\u003c\/li\u003e\n\u003cli\u003eTransformer-balanced tube buffer I\/O with galvanic isolation\u003c\/li\u003e\n\u003cli\u003eLinear power supply with GZ34 tube rectifier, ultra-low-noise filtering\u003c\/li\u003e\n\u003cli\u003eInputs: AES\/EBU, S\/PDIF, ADAT, USB, Bluetooth (QCC5125 Qualcomm)\u003c\/li\u003e\n\u003cli\u003eUSB: PCM up to 384 kHz, DSD64\/128\/256\/512\u003c\/li\u003e\n\u003cli\u003eOutputs: RCA 2.5 V RMS, XLR 5 V RMS (balanced)\u003c\/li\u003e\n\u003cli\u003e2-inch OLED display, IR remote control\u003c\/li\u003e\n\u003cli\u003eFrequency response: 8 Hz – 80 kHz ±1 dB\u003c\/li\u003e\n\u003cli\u003eDesigned and manufactured in Poland\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eTECHNICAL SPECIFICATIONS\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eType: digital-to-analog converter with tube output buffer\u003c\/li\u003e\n\u003cli\u003eDAC chips: 2× AK4493SEQ (AKM, dual)\u003c\/li\u003e\n\u003cli\u003eDigital receiver: AK4118 (AKM)\u003c\/li\u003e\n\u003cli\u003eBluetooth receiver: QCC5125 (Qualcomm)\u003c\/li\u003e\n\u003cli\u003eBuffer tubes: 2× 6N6P-VI or 6N30P (NOS military-grade)\u003c\/li\u003e\n\u003cli\u003ePower supply rectifier: GZ34 (tube)\u003c\/li\u003e\n\u003cli\u003eTHD: below 0.03% (1 kHz, 0 dBFS)\u003c\/li\u003e\n\u003cli\u003eDynamic range: 112 dB (AES17)\u003c\/li\u003e\n\u003cli\u003eFrequency response: 8 Hz – 80 kHz ±1 dB\u003c\/li\u003e\n\u003cli\u003eUSB input: PCM 44.1–384 kHz, DSD64\/128\/256\/512\u003c\/li\u003e\n\u003cli\u003eAES\/EBU, S\/PDIF, ADAT inputs: PCM 44.1–192 kHz\u003c\/li\u003e\n\u003cli\u003eBluetooth: PCM 44.1–96 kHz\u003c\/li\u003e\n\u003cli\u003eRCA output: 2.5 V RMS (unbalanced)\u003c\/li\u003e\n\u003cli\u003eXLR output: 5 V RMS (balanced)\u003c\/li\u003e\n\u003cli\u003ePower consumption: 45 W\u003c\/li\u003e\n\u003cli\u003eEnclosure: 3 mm CNC aluminium, 380 × 290 mm\u003c\/li\u003e\n\u003cli\u003eWeight: 6 kg\u003c\/li\u003e\n\u003cli\u003eManufactured in Poland\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e","brand":"IGS Audio","offers":[{"title":"Default Title","offer_id":54001640112465,"sku":"60249","price":2490.0,"currency_code":"EUR","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0729\/8741\/0769\/files\/IGSAudioDACO1.jpg?v=1781176010"},{"product_id":"igs-audio-phom","title":"IGS Audio PHOM","description":"\u003cdiv lang=\"en\"\u003e\n\u003cstrong\u003eIGS Audio PHOM\u003c\/strong\u003e\n\n\u003cp\u003ePHOM is a tube phono preamplifier for MM and MC cartridges, designed and manufactured in Poland by IGS Audio. The signal path is fully tube-based and all-analog, operating without global negative feedback. Two gain stages in cascode configuration bracket a fully passive RIAA equalization network placed between them – not inside a feedback loop. Passive inter-stage RIAA eliminates the phase distortion artefacts and nonlinearities that active equalization introduces. Four 6N1P-EV tubes from NOS military-grade stock form a hand-selected matched quartet. The power supply uses a GZ34 tube rectifier with choke filtering for soft-start behaviour, extended tube life, and stable DC rail delivery. The UTM Industry mains transformer is substantially oversized relative to the power consumption of 55 W. The finished unit weighs 9 kg and sits in a 380×290 mm enclosure built from 3 mm CNC-machined aluminium.\u003c\/p\u003e\n\n\u003ch3\u003eTransformer-coupled MC input – why it matters at this signal level\u003c\/h3\u003e\n\u003cp\u003eMoving-coil cartridges output signals ranging from tens of microvolts to a few millivolts – far lower than MM cartridges. Any noise introduced at this stage is amplified through every subsequent gain stage along with the signal. PHOM addresses this with a transformer-coupled MC input: a step-up transformer raises the MC cartridge signal before it reaches the first tube, without adding active electronic noise in the process. Resistive loading for MC cartridges is adjustable across 16 steps from 56 ohms to 1000 ohms, covering the full range of internal impedances found in real-world MC cartridges and allowing precise impedance matching for each specific unit. MM cartridges receive 16-step capacitive loading from 22 pF to 390 pF to correct resonance behaviour in the upper frequency range. Gain exceeds 60 dB for MM and reaches up to 80 dB for MC.\u003c\/p\u003e\n\n\u003ch3\u003ePassive RIAA network and component selection\u003c\/h3\u003e\n\u003cp\u003eThe RIAA correction network in PHOM is passive and placed between the two gain stages rather than inside a feedback loop, preserving the open-loop character of the amplification. Three capacitor types are combined in the network: NOS Paper in Oil capacitors, Silver Mica, and Mundorf EVO. Paper-in-Oil types are chosen for their natural, fluid dielectric behaviour and low microphony; Silver Mica for thermal stability and tight value tolerances; Mundorf EVO for low ESR and consistent frequency response across the audio band. Nominal output is 0.775 V RMS (2 Vpp) with maximum gain of 62 dB. A turntable ground terminal on the rear panel eliminates inductive hum without adapters. The front panel uses a minimalist layout with a single LED power indicator; all cartridge loading adjustments are accessed from the rear.\u003c\/p\u003e\n\n\u003ch3\u003eKEY FEATURES\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eFully tube, all-analog signal path without global negative feedback\u003c\/li\u003e\n\u003cli\u003ePassive inter-stage RIAA equalization – no active correction loop artefacts\u003c\/li\u003e\n\u003cli\u003eTwo cascode gain stages with matched quartet of NOS military-grade 6N1P-EV tubes\u003c\/li\u003e\n\u003cli\u003eTransformer-coupled MC input – minimum noise at the first gain stage\u003c\/li\u003e\n\u003cli\u003e16-step resistive MC loading: 56 Ω – 1000 Ω\u003c\/li\u003e\n\u003cli\u003e16-step capacitive MM loading: 22 pF – 390 pF\u003c\/li\u003e\n\u003cli\u003eGain: above 60 dB (MM) \/ up to 80 dB (MC)\u003c\/li\u003e\n\u003cli\u003eRIAA capacitors: NOS Paper in Oil, Silver Mica, Mundorf EVO\u003c\/li\u003e\n\u003cli\u003ePower supply: GZ34 tube rectifier + choke filter, UTM Industry transformer\u003c\/li\u003e\n\u003cli\u003eDesigned and manufactured in Poland, weight 9 kg\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eTECHNICAL SPECIFICATIONS\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eType: tube phono preamplifier MM\/MC\u003c\/li\u003e\n\u003cli\u003eSignal tubes: 4× 6N1P-EV NOS (military-grade, matched quartet)\u003c\/li\u003e\n\u003cli\u003eRectifier: GZ34 (tube), choke-filtered power supply\u003c\/li\u003e\n\u003cli\u003eRIAA equalization: passive, inter-stage\u003c\/li\u003e\n\u003cli\u003eGain: max. 62 dB (MM) \/ up to 80 dB (MC)\u003c\/li\u003e\n\u003cli\u003eOutput level: 0.775 V RMS (2 Vpp)\u003c\/li\u003e\n\u003cli\u003eMC loading: 16 resistive steps, 56 Ω – 1000 Ω\u003c\/li\u003e\n\u003cli\u003eMM loading: 16 capacitive steps, 22 pF – 390 pF\u003c\/li\u003e\n\u003cli\u003eMC input: transformer-coupled\u003c\/li\u003e\n\u003cli\u003eConnectors: RCA input\/output, turntable ground terminal\u003c\/li\u003e\n\u003cli\u003ePower consumption: 55 W\u003c\/li\u003e\n\u003cli\u003eEnclosure: 3 mm CNC aluminium, 380 × 290 mm\u003c\/li\u003e\n\u003cli\u003eWeight: 9 kg\u003c\/li\u003e\n\u003cli\u003eManufactured in Poland\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e","brand":"IGS Audio","offers":[{"title":"Default Title","offer_id":54001642438993,"sku":"60253","price":2290.0,"currency_code":"EUR","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0729\/8741\/0769\/files\/IGSAudioPHOM1.jpg?v=1781175993"},{"product_id":"igs-audio-thermidt-hi-fi-tube-amplifier","title":"IGS Audio Thermidt","description":"\u003cdiv lang=\"en\"\u003e\n\u003cstrong\u003eIGS Audio Thermidt\u003c\/strong\u003e\n\n\u003cp\u003eThermidt is a stereo tube amplifier positioned at the crossover between high-fidelity listening and studio monitoring, built by IGS Audio for users who want tube character without sacrificing bass control and dynamic accuracy. The circuit uses Negative Cathode Feedback (NCF) instead of a conventional global negative feedback loop: distortion is managed locally at the cathode stage rather than being corrected after the fact by wrapping the entire signal path into a global feedback loop. The power stage runs four 7189\/6N14P-EV tubes in Class AB push-pull with fixed bias; the driver stage employs two 6BL8 triode-pentode valves. Output power is 2×21 W into 4 or 8 ohm loads. At 29 kg, the weight is a direct result of the UTM Industry-designed output transformers – wound in multiple sections with insulated layers over a Z11 Grain-Oriented laminated steel core, chosen specifically for its low core losses and superior low-frequency transfer characteristics.\u003c\/p\u003e\n\n\u003ch3\u003eNCF topology and output transformers – what actually determines the sound\u003c\/h3\u003e\n\u003cp\u003eConventional tube amplifiers using global NFB reduce distortion at the cost of dynamic envelope and the tonal character listeners associate with tube amplification – the feedback loop smooths the response but simultaneously removes some of the transient openness of the circuit. NCF applies correction locally at the cathode, at the point where distortion originates, without routing the signal globally backwards through the full amplification path. The result is THD of no more than 0.15% at 20 W alongside the dynamic behaviour and sonic openness of a low-feedback design. The UTM output transformers with Z11 Grain-Oriented core reinforce this directly: grain-oriented silicon steel reduces hysteresis losses in the core and improves low-frequency magnetic coupling, which translates into tighter, more defined bass at full output power rather than the soft, slow bottom end common in budget transformers.\u003c\/p\u003e\n\n\u003ch3\u003eConnectivity and studio integration\u003c\/h3\u003e\n\u003cp\u003eThermidt accepts analog sources via RCA Cinch inputs at 775 mV RMS sensitivity, and includes a built-in DLHiFi Bluetooth 5.1 LDAC module operating at 24-bit\/192 kHz with a 100-metre range – high-resolution wireless streaming without external converters or cables. A dedicated headphone output handles headphones from 16 ohms upward. Three operating modes – Flat, Bass, and Loudness – allow the frequency response to be adapted to room characteristics or monitoring preference. The 8 mm CNC-machined top plate with chimney-effect ventilation slots provides sustained tube cooling during extended sessions. Frequency response of 10 Hz – 80 kHz ±1 dB and IMD of no more than 0.85% at 15 W place Thermidt well within reference-grade amplifier territory.\u003c\/p\u003e\n\n\u003ch3\u003eKEY FEATURES\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eNCF (Negative Cathode Feedback) topology – local distortion control without global NFB loop\u003c\/li\u003e\n\u003cli\u003eClass AB push-pull, fixed bias, 2×21 W into 4 or 8 ohms\u003c\/li\u003e\n\u003cli\u003ePower stage: 4× 7189\/6N14P-EV tubes\u003c\/li\u003e\n\u003cli\u003eDriver stage: 2× 6BL8 triode-pentode\u003c\/li\u003e\n\u003cli\u003eUTM Industry output transformers, Z11 Grain-Oriented core, multi-section winding\u003c\/li\u003e\n\u003cli\u003eBuilt-in Bluetooth DLHiFi 5.1 LDAC, 24-bit\/192 kHz, 100 m range\u003c\/li\u003e\n\u003cli\u003eDedicated headphone output: from 16 ohms\u003c\/li\u003e\n\u003cli\u003eOperating modes: Flat, Bass, Loudness\u003c\/li\u003e\n\u003cli\u003e8 mm CNC-machined top plate with chimney-effect ventilation\u003c\/li\u003e\n\u003cli\u003eWeight: 29 kg\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eTECHNICAL SPECIFICATIONS\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eType: stereo tube amplifier, Class AB push-pull (fixed bias)\u003c\/li\u003e\n\u003cli\u003eOutput power: 2×21 W (4 Ω or 8 Ω)\u003c\/li\u003e\n\u003cli\u003ePower stage tubes: 4× 7189\/6N14P-EV\u003c\/li\u003e\n\u003cli\u003eDriver stage tubes: 2× 6BL8 (triode-pentode)\u003c\/li\u003e\n\u003cli\u003eTHD: max. 0.15% @ 20 W\u003c\/li\u003e\n\u003cli\u003eTHD: max. 0.15% @ 15 W, 100 Hz\u003c\/li\u003e\n\u003cli\u003eIMD: max. 0.85% @ 15 W, 50 Hz\u003c\/li\u003e\n\u003cli\u003eSNR: above 52 dB\u003c\/li\u003e\n\u003cli\u003eFrequency response: 10 Hz – 80 kHz ±1 dB\u003c\/li\u003e\n\u003cli\u003eInput sensitivity: 775 mV RMS\u003c\/li\u003e\n\u003cli\u003eInputs: RCA Cinch, Bluetooth 5.1 LDAC (24-bit\/192 kHz)\u003c\/li\u003e\n\u003cli\u003eHeadphone output: yes, from 16 Ω\u003c\/li\u003e\n\u003cli\u003ePower supply: 230 V \/ 110 V AC, 50\/60 Hz, 150 VA\u003c\/li\u003e\n\u003cli\u003eWeight: 29 kg\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e","brand":"IGS Audio","offers":[{"title":"Default Title","offer_id":54001645420881,"sku":"60251","price":3395.0,"currency_code":"EUR","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0729\/8741\/0769\/files\/IGSAudioThermidt-Hi-FiTubeAmplifier1.jpg?v=1781175973"},{"product_id":"igs-audio-825eq","title":"IGS Audio 825EQ","description":"\u003cdiv lang=\"en\"\u003e\n\u003cstrong\u003eIGS Audio 825EQ\u003c\/strong\u003e\n\n\u003cp\u003eThe 825EQ is a stereo tube mastering equalizer in a 3U 19\" chassis, built on the topology of Tim de Paravicini's EAR 825Q – one of the most sought-after and expensive mastering EQs of the past several decades. IGS Audio implements the design with a full tube signal path: three ECC88 valves per channel, three audio transformers per channel, and UTM transformer-balanced inputs and outputs throughout. Five bands per channel – two shelving filters and three bell filters – are controlled exclusively via 24-way ELMA switches. Proportional Q ranging from 0.3 to 6 means the filter curve narrows as gain increases, a behaviour characteristic of the best tube EQs that makes both subtle ±0.5 dB mastering moves and more pronounced tonal shaping sound natural and musical. The unit is available in two versions: 0.5 dB steps covering ±6 dB, or 1 dB steps covering ±12 dB.\u003c\/p\u003e\n\n\u003ch3\u003eNo hardwire bypass – by design, not omission\u003c\/h3\u003e\n\u003cp\u003eThe 825EQ has no hardwire bypass in the conventional sense. When all bands are switched off, the signal continues to pass through the transformers and valves. This is a deliberate circuit decision: the pair of UTM transformers at input and output, combined with six ECC88 tubes in the signal path, introduce depth, cohesion, and stereo width to the material regardless of any EQ moves. The act of passing audio through the 825EQ – without touching a single band – already changes the character of the master. ECC88 tubes can be swapped for 6N23P or 6N1P variants to shift the tonal signature from warmer and denser toward more open and transparent, depending on the project and source material.\u003c\/p\u003e\n\n\u003ch3\u003eFive bands with proportional Q across the full mastering workflow\u003c\/h3\u003e\n\u003cp\u003eLow shelf and high shelf handle the frequency extremes; three bell filters cover low-mid, mid, and high-mid. Every band has a fixed frequency selection set and a 24-way ELMA gain switch – session recall is exact and fast without photographing the panel or writing down positions. Dynamic range exceeds 107 dBA at 1 kHz, output impedance is 600 ohms, maximum output level +22 dBu. A linear power supply stabilises the operating conditions for the valves under full load. The 825EQ is aimed primarily at mastering and mix bus duties, but works equally well on stems and groups where more pronounced tonal shaping is required.\u003c\/p\u003e\n\n\u003ch3\u003eKEY FEATURES\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e5-band stereo tube mastering equalizer (EAR 825Q-style), 3U 19\"\u003c\/li\u003e\n\u003cli\u003eThree ECC88 tubes per channel – swappable for 6N23P or 6N1P\u003c\/li\u003e\n\u003cli\u003eThree audio transformers per channel + UTM transformer-balanced I\/O\u003c\/li\u003e\n\u003cli\u003eAll 24-way ELMA switches throughout – full session recall\u003c\/li\u003e\n\u003cli\u003eProportional Q: 0.3–6 (curve narrows as gain increases)\u003c\/li\u003e\n\u003cli\u003eTwo versions: ±6 dB (0.5 dB steps) or ±12 dB (1 dB steps)\u003c\/li\u003e\n\u003cli\u003eNo hardwire bypass – signal always passes through transformers and tubes\u003c\/li\u003e\n\u003cli\u003eLinear power supply\u003c\/li\u003e\n\u003cli\u003eBands: low shelf, low-mid bell, mid bell, high-mid bell, high shelf\u003c\/li\u003e\n\u003cli\u003eFrequency range: 10 Hz – 50 kHz\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eTECHNICAL SPECIFICATIONS\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eType: stereo tube equalizer, 5-band (EAR 825Q-style)\u003c\/li\u003e\n\u003cli\u003eFormat: 3U, 19\"\u003c\/li\u003e\n\u003cli\u003eTubes: 3x ECC88 per channel (optional 6N23P or 6N1P)\u003c\/li\u003e\n\u003cli\u003eTransformers: 3 audio per channel + UTM I\/O\u003c\/li\u003e\n\u003cli\u003eSwitches: ELMA, 24-way, all bands\u003c\/li\u003e\n\u003cli\u003eQ: proportional, 0.3–6\u003c\/li\u003e\n\u003cli\u003eCorrection range: ±6 dB (0.5 dB steps) or ±12 dB (1 dB steps)\u003c\/li\u003e\n\u003cli\u003eFrequency range: 10 Hz – 50 kHz (±0.4 dB)\u003c\/li\u003e\n\u003cli\u003eInput impedance (balanced): 10 kΩ, IGS Custom Transformers \/ XLR\u003c\/li\u003e\n\u003cli\u003eOutput impedance (balanced): 600 Ω, IGS Custom Transformers \/ XLR\u003c\/li\u003e\n\u003cli\u003eOperating level: +4 dBu\u003c\/li\u003e\n\u003cli\u003eMaximum output level: +22 dBu\u003c\/li\u003e\n\u003cli\u003eDynamic range: above 107 dBA (1 kHz, +22 dBu)\u003c\/li\u003e\n\u003cli\u003eBypass: no hardwire (signal passes through tubes and transformers)\u003c\/li\u003e\n\u003cli\u003ePower supply: linear\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e","brand":"IGS Audio","offers":[{"title":"Default Title","offer_id":54001646240081,"sku":"60250","price":3620.0,"currency_code":"EUR","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0729\/8741\/0769\/files\/IGSAudio825EQ1.jpg?v=1781175958"},{"product_id":"igs-audio-a-type-525","title":"IGS Audio A-Type 525","description":"\u003cdiv lang=\"en\"\u003e\n\u003cstrong\u003eIGS Audio A-Type 525\u003c\/strong\u003e\n\n\u003cp\u003eThe A-Type 525 is a discrete VCR compressor\/limiter in 500-series format, modelled on a classic American design from the 1970s. The entire signal path uses discrete through-hole components – no integrated circuits in the compression stage. Input balancing is handled by an SSM2141 op-amp; the output runs through an IGS Custom transformer. A second audio transformer sits in the feedback path: it conditions the detection signal before returning it to the VCR (Voltage Controlled Resistor), which directly controls the resistance of the first gain stage. This is a true feedback topology – the compressor responds to what has already passed through the first amplification stage rather than anticipating the input, which produces the characteristically musical gain reduction behaviour associated with classic American hardware from that era.\u003c\/p\u003e\n\n\u003ch3\u003eCompress switch – one control instead of two\u003c\/h3\u003e\n\u003cp\u003eThe control layout is where the A-Type 525 separates itself from standard clones. The Compress switch simultaneously adjusts Gain and Threshold together, allowing the engineer to dial in compression depth while keeping peak output level constant. This removes one of the most common errors in evaluating compressor behaviour in-session: mistaking loudness for effectiveness. Separate Threshold and Output controls remain available for independent fine-tuning of the activation point and output level. Attack time is fixed at 15 µs – fast enough for transient control on drums, picked bass, and acoustic guitar. Release time is user-selectable across four discrete steps: 0.1 s, 0.5 s, 1.5 s, and 2.0 s.\u003c\/p\u003e\n\n\u003ch3\u003eLimiter and de-esser without additional modules\u003c\/h3\u003e\n\u003cp\u003eBeyond Compressor (2:1) and Limiter (20:1) modes, the A-Type 525 includes a built-in de-esser – a function that typically requires a separate module or a DAW insert. The de-esser attenuates sibilance in vocal recordings without touching the surrounding frequency content, making it possible to handle sibilance control at the tracking stage directly in the 500-series chain. Hardwire bypass and multi-unit linking capability complete the feature set for stereo or multi-channel setups. Maximum gain reduction is 25 dB; maximum input level +27 dBu, maximum output level +28 dBu.\u003c\/p\u003e\n\n\u003ch3\u003eKEY FEATURES\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eDiscrete VCR feedback topology – no integrated circuits in the compression path\u003c\/li\u003e\n\u003cli\u003eCompress switch – simultaneous Gain and Threshold adjustment without peak level change\u003c\/li\u003e\n\u003cli\u003eFixed attack time: 15 µs\u003c\/li\u003e\n\u003cli\u003eFour release times: 0.1 \/ 0.5 \/ 1.5 \/ 2.0 s\u003c\/li\u003e\n\u003cli\u003eOperating modes: Compressor (2:1), Limiter (20:1), De-Esser\u003c\/li\u003e\n\u003cli\u003eBalanced input: SSM2141 op-amp\u003c\/li\u003e\n\u003cli\u003eTransformer output: IGS Custom\u003c\/li\u003e\n\u003cli\u003eSecond transformer in the feedback detection path\u003c\/li\u003e\n\u003cli\u003eHardwire bypass\u003c\/li\u003e\n\u003cli\u003eMulti-unit linking for stereo and multi-channel use\u003c\/li\u003e\n\u003cli\u003e3-year manufacturer warranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eTECHNICAL SPECIFICATIONS\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eType: discrete VCR compressor\/limiter, 500-series, mono\u003c\/li\u003e\n\u003cli\u003eOperating modes: Compressor 2:1, Limiter 20:1, De-Esser\u003c\/li\u003e\n\u003cli\u003eAttack time: 15 µs (fixed)\u003c\/li\u003e\n\u003cli\u003eRelease time: 0.1 \/ 0.5 \/ 1.5 \/ 2.0 s\u003c\/li\u003e\n\u003cli\u003eMaximum gain reduction: 25 dB\u003c\/li\u003e\n\u003cli\u003eMaximum gain: 25 dB\u003c\/li\u003e\n\u003cli\u003eInput impedance (balanced): 10 kΩ, SSM2141\u003c\/li\u003e\n\u003cli\u003eOutput impedance (balanced): 75 Ω, IGS Custom transformer\u003c\/li\u003e\n\u003cli\u003eOperating level: +4 dBu\u003c\/li\u003e\n\u003cli\u003eMaximum input level: +27 dBu\u003c\/li\u003e\n\u003cli\u003eMaximum output level: +28 dBu\u003c\/li\u003e\n\u003cli\u003eBypass: hardwire\u003c\/li\u003e\n\u003cli\u003eLinking: yes\u003c\/li\u003e\n\u003cli\u003eFormat: 500-series, single slot\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e","brand":"IGS Audio","offers":[{"title":"Default Title","offer_id":54001646305617,"sku":"60248","price":755.0,"currency_code":"EUR","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0729\/8741\/0769\/files\/IGSAudioA-Type5251.jpg?v=1781175942"},{"product_id":"igs-audio-573eq","title":"IGS Audio 573EQ","description":"\u003cdiv lang=\"en\"\u003e\n\u003cstrong\u003eIGS Audio 573EQ\u003c\/strong\u003e\n\n\u003cp\u003eThe 573EQ is an inductor-based equalizer in 500-series format, built by IGS Audio as a development of the classic British Neve 1073-style EQ topology. All four rotary switches on the front panel are ELMA units manufactured in Switzerland – the same switch quality found in mastering-grade hardware at significantly higher price points. The key addition over standard 1073-style 500-series clones is a seventh control: a highpass filter covering six selectable frequencies. A pair of 573EQs on the mix bus with no EQ moves applied introduces analog coherence and colour that is difficult to replicate by other means – a property of the inductor-based circuit interacting with the transformer-balanced signal path.\u003c\/p\u003e\n\n\u003ch3\u003eSeven controls where competitors offer six\u003c\/h3\u003e\n\u003cp\u003eMost 1073-format 500-series modules ship with six controls covering low shelf, mid bell, high shelf, and band selectors. The 573EQ adds a highpass filter with steps at OFF, 25, 45, 70, 160, and 360 Hz – the single most-used corrective tool on individual tracks in most sessions. It removes low-end clutter from instrument and vocal channels without engaging the main EQ bands and without reaching for a separate HPF module or a DAW plugin. Low shelf covers OFF through 220 Hz in six steps. The midrange band provides 12 selectable frequencies from 250 Hz to 10 kHz. High shelf runs across 8, 10, 12, 16, and 20 kHz. Every position is a switched step via ELMA rotary, meaning recall is exact and repeatable without photographing the panel.\u003c\/p\u003e\n\n\u003ch3\u003eInductor topology – where the character actually comes from\u003c\/h3\u003e\n\u003cp\u003eInductor-based EQ circuits produce asymmetric curves with a behaviour at the band edges that capacitor-based or digital implementations do not replicate at equivalent gain settings. That is why low-shelf boost on a 1073-style unit sounds dense without becoming slow, and high-shelf boost opens the material without adding the hardness common in active EQs. IGS Audio uses modern transparent op-amps rather than discrete amplifier stages, which keeps the noise floor low and makes the 573EQ integrate cleanly with transformer-balanced preamps or compressors in the same 500-series rack. The module carries a three-year manufacturer warranty.\u003c\/p\u003e\n\n\u003ch3\u003eKEY FEATURES\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e3-band inductor EQ plus highpass filter, 500-series format, mono\u003c\/li\u003e\n\u003cli\u003e7 front-panel controls – one more than standard 1073-style clones\u003c\/li\u003e\n\u003cli\u003eAll four rotary switches ELMA (Switzerland) – fully recallable settings\u003c\/li\u003e\n\u003cli\u003eHighpass filter: OFF, 25, 45, 70, 160, 360 Hz\u003c\/li\u003e\n\u003cli\u003eLow shelf: OFF, 20, 35, 60, 110, 220 Hz\u003c\/li\u003e\n\u003cli\u003eMid band: 12 steps, 250 Hz – 10 kHz\u003c\/li\u003e\n\u003cli\u003eHigh shelf: 8, 10, 12, 16, 20 kHz\u003c\/li\u003e\n\u003cli\u003eModern transparent op-amps\u003c\/li\u003e\n\u003cli\u003eCompatible with transformer-balanced preamps and compressors in the same rack\u003c\/li\u003e\n\u003cli\u003e3-year manufacturer warranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eTECHNICAL SPECIFICATIONS\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eType: inductor band equalizer (Neve 1073-style)\u003c\/li\u003e\n\u003cli\u003eFormat: 500-series, single slot, mono\u003c\/li\u003e\n\u003cli\u003eControls: 7\u003c\/li\u003e\n\u003cli\u003eHP filter: OFF \/ 25 \/ 45 \/ 70 \/ 160 \/ 360 Hz\u003c\/li\u003e\n\u003cli\u003eLow shelf: OFF \/ 20 \/ 35 \/ 60 \/ 110 \/ 220 Hz\u003c\/li\u003e\n\u003cli\u003eMid band: OFF \/ 0.25 \/ 0.36 \/ 0.5 \/ 0.7 \/ 1.1 \/ 1.6 \/ 2.3 \/ 3.2 \/ 4.8 \/ 7.2 \/ 10 kHz\u003c\/li\u003e\n\u003cli\u003eHigh shelf: 8 \/ 10 \/ 12 \/ 16 \/ 20 kHz\u003c\/li\u003e\n\u003cli\u003eSwitches: ELMA (Switzerland), all four bands\u003c\/li\u003e\n\u003cli\u003eAmplifiers: modern op-amps, transparent signal path\u003c\/li\u003e\n\u003cli\u003eWarranty: 3 years\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e","brand":"IGS Audio","offers":[{"title":"Default Title","offer_id":54001646600529,"sku":"60247","price":895.0,"currency_code":"EUR","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0729\/8741\/0769\/files\/IGSAudio573EQ1.jpg?v=1781175926"},{"product_id":"igs-audio-eqm500","title":"IGS Audio EQM500","description":"\u003cdiv lang=\"en\"\u003e\n\u003cstrong\u003eIGS Audio EQM500\u003c\/strong\u003e\n\n\u003cp\u003eThe EQM500 is a mono passive equalizer in 500-series format, built by Polish manufacturer IGS Audio on the circuit principles of the classic Pultec designs from the 1950s. All three bands – LOW, MID, and HIGH – are LC resonant circuits using UTM Industry inductors wound to 1% tolerance. Input and output are transformer-balanced via UTM transformers. Frequency selection runs through Grayhill stepped switches throughout, making every setting fully recallable without relying on memory or marked positions on a pot. Boost and cut range is 12 dB with a fixed Q of 0.7 – wide, musical curves suited to tonal shaping rather than surgical correction. The EQM500 is assembled as a single-slot 500-series module and can be paired with other IGS Audio or third-party 500-series units inside any standard lunchbox or rack frame.\u003c\/p\u003e\n\n\u003ch3\u003eMidrange control as the primary problem-solver\u003c\/h3\u003e\n\u003cp\u003eThe MID band covers 12 frequency steps across 200 Hz – 7 kHz and operates in cut-only mode. That is a deliberate design decision: passive midrange EQ works most naturally when attenuating. It is the right tool for pulling out room resonances that survive acoustic treatment, resolving frequency conflicts between instruments stacked in the same range, and reducing vocal presence issues without touching the surrounding harmonic content. The 200 Hz – 7 kHz range concentrates the highest energy density in most audio material – where problems in a mix are most audible and where imprecise moves have the widest consequences on translation.\u003c\/p\u003e\n\n\u003ch3\u003eLOW and HIGH – passive boost that behaves like a passive boost\u003c\/h3\u003e\n\u003cp\u003eThe LOW and HIGH bands each provide six selectable boost frequencies. Passive LC boost does not mirror the behaviour of a digital or active EQ at the same gain setting – the curve rises gently, widens as it increases, and rolls off naturally at the band edges. That asymmetric shape is what gives Pultec-style EQs their reputation for adding body to low end and air to the top without the hardness that appears with linear-phase or steep active filters. Hard-wire bypass enables clean A\/B comparison with the full signal path active. At 20 Hz – 20 kHz ±0.1 dB the EQM500 introduces negligible coloration outside the frequencies being processed.\u003c\/p\u003e\n\n\u003ch3\u003eKEY FEATURES\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e3-band passive equalizer in 500-series format, mono\u003c\/li\u003e\n\u003cli\u003eLC resonant circuits with UTM Industry inductors, 1% tolerance\u003c\/li\u003e\n\u003cli\u003eTransformer-balanced I\/O (UTM) throughout\u003c\/li\u003e\n\u003cli\u003eGrayhill stepped switches – fully recallable settings\u003c\/li\u003e\n\u003cli\u003eMID band: 12 frequency steps, 200 Hz – 7 kHz, cut only\u003c\/li\u003e\n\u003cli\u003eLOW and HIGH bands: 6 frequency steps each, boost only\u003c\/li\u003e\n\u003cli\u003eBoost\/cut range: 12 dB\u003c\/li\u003e\n\u003cli\u003eQ = 0.7 – wide, musical correction curve\u003c\/li\u003e\n\u003cli\u003eHard-wire bypass\u003c\/li\u003e\n\u003cli\u003eFrequency response: 20 Hz – 20 kHz ±0.1 dB\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eTECHNICAL SPECIFICATIONS\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eType: passive band equalizer (Pultec-style)\u003c\/li\u003e\n\u003cli\u003eFormat: 500-series, single slot, mono\u003c\/li\u003e\n\u003cli\u003eBands: 3 (LOW, MID, HIGH)\u003c\/li\u003e\n\u003cli\u003eMID frequencies: 12 steps, 200 Hz – 7 kHz (cut only)\u003c\/li\u003e\n\u003cli\u003eLOW \/ HIGH frequencies: 6 steps each (boost only)\u003c\/li\u003e\n\u003cli\u003eCorrection range: ±12 dB\u003c\/li\u003e\n\u003cli\u003eQ: 0.7\u003c\/li\u003e\n\u003cli\u003eInductors: UTM Industry, 1% tolerance\u003c\/li\u003e\n\u003cli\u003eTransformers: IGS Custom \/ UTM, input and output\u003c\/li\u003e\n\u003cli\u003eSwitches: Grayhill (USA)\u003c\/li\u003e\n\u003cli\u003eFrequency response: 20 Hz – 20 kHz ±0.1 dB\u003c\/li\u003e\n\u003cli\u003eBypass: hard-wire\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e","brand":"IGS Audio","offers":[{"title":"Default Title","offer_id":54001647157585,"sku":"60252","price":725.0,"currency_code":"EUR","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0729\/8741\/0769\/files\/IGSAudioEQM5001.jpg?v=1781175899"}],"url":"https:\/\/wrdtunes.com\/de-fr\/collections\/igs-audio.oembed","provider":"Wired Tunes","version":"1.0","type":"link"}