{"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":2139.52,"currency_code":"EUR","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0729\/8741\/0769\/files\/IGSAudioRUBBERBANDS1.jpg?v=1781115349","url":"https:\/\/wrdtunes.com\/en-fr\/products\/igs-audio-rubber-bands","provider":"Wired Tunes","version":"1.0","type":"link"}