{"product_id":"retro-instruments-2a3","title":"Retro Instruments 2A3","description":"\u003cdiv lang=\"en\"\u003e\n\u003cp\u003e\u003cstrong\u003eRetro Instruments 2A3\u003c\/strong\u003e is a dual-channel tube program equalizer in a 2U chassis, built around fully passive capacitor and inductor equalization. Its curves follow the standard set by the Pultec equalizers, with the set of high-frequency boost centres extended by several additional points. Level is restored by a class AB tube amplifier running at unity gain on two 12AX7 and two 12AU7 tubes, with custom-designed transformers.\u003c\/p\u003e\n\u003ch3\u003eA subsonic filter for peaking low-frequency boosts\u003c\/h3\u003e\n\u003cp\u003eClassic passive equalization adds excess energy below the useful band when you boost the lows, which on subwoofer-equipped monitors and club systems eats headroom for no audible return. The 2A3's subsonic filter handles this differently from a plain highpass: it works through the interstage transformer and offers 40 and 90 Hz settings with a peaking response and a sharp cutoff, turning a shelf boost into a lift with a defined peak. The 40 Hz setting takes nothing off the bottom while adding energy around 35 to 40 Hz. The filter switches out whenever material calls for tight, accurate low-frequency response.\u003c\/p\u003e\n\u003ch3\u003eTwo channels and ten high-frequency centres in one unit\u003c\/h3\u003e\n\u003cp\u003eBoth channels fit into 2U with separation exceeding 70 dB, so you can work in stereo, across two independent tracks, or cascaded, feeding one channel into the other for extended equalization. High-frequency boost offers ten centres from 1.5 to 16 kHz, more than the original passive designs, which lets you place a single track in a mix more precisely or add presence to a vocal without moving into the sibilance band. The low section keeps the simultaneous boost-and-cut arrangement that scoops out mud and adds punch to kick and bass. The knob scales carry a hundred positions, so settings are reproducible.\u003c\/p\u003e\n\u003ch3\u003eKEY FEATURES\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eTwo channels of tube program equalization in a 2U chassis\u003c\/li\u003e\n\u003cli\u003eFully passive capacitor and inductor equalization with no feedback loop\u003c\/li\u003e\n\u003cli\u003eCurves consistent with the Pultec equalizer standard\u003c\/li\u003e\n\u003cli\u003eTen high-frequency boost centres from 1.5 to 16 kHz\u003c\/li\u003e\n\u003cli\u003eSubsonic filter at 40 and 90 Hz coupled through the interstage transformer\u003c\/li\u003e\n\u003cli\u003eSimultaneous low boost and cut in the classic Pultec arrangement\u003c\/li\u003e\n\u003cli\u003eHundred-position knob scales for reproducible settings\u003c\/li\u003e\n\u003cli\u003eChannel separation above 70 dB\u003c\/li\u003e\n\u003cli\u003eClass AB tube amplifier at unity gain\u003c\/li\u003e\n\u003cli\u003eEqualization bypass switches per channel\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eTECHNICAL SPECIFICATIONS\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eLow-frequency boost: 20, 30, 60 and 100 Hz\u003c\/li\u003e\n\u003cli\u003eLow-frequency cut: 20, 30, 60 and 100 Hz\u003c\/li\u003e\n\u003cli\u003eHigh-frequency boost: 1.5, 3, 4, 5, 6, 8, 10, 12, 14 and 16 kHz\u003c\/li\u003e\n\u003cli\u003eHigh-frequency cut: 5, 10 and 20 kHz\u003c\/li\u003e\n\u003cli\u003eSubsonic filter: 40 and 90 Hz, peaking response with sharp cutoff\u003c\/li\u003e\n\u003cli\u003eSignal-to-noise ratio: greater than 76 dB\u003c\/li\u003e\n\u003cli\u003eChannel separation: greater than 70 dB\u003c\/li\u003e\n\u003cli\u003eFrequency response: flat within 1 dB, 20-20,000 Hz\u003c\/li\u003e\n\u003cli\u003eHarmonic distortion: below 1%, 20-20,000 Hz\u003c\/li\u003e\n\u003cli\u003eInput and output: 600 Ohms, fully floating, transformer balanced, XLR\u003c\/li\u003e\n\u003cli\u003eTubes: 2x 12AX7 and 2x 12AU7, jumper-selectable 6 or 12 volt heater configuration\u003c\/li\u003e\n\u003cli\u003eDimensions: 2U, 19 x 3.5 x 9 inches, IEC power 115\/230 V, 50-60 Hz\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e","brand":"Retro Instruments","offers":[{"title":"Default Title","offer_id":54598548128081,"sku":"28579","price":0.0,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0729\/8741\/0769\/files\/RetroInstruments2A31.jpg?v=1786975494","url":"https:\/\/wrdtunes.com\/de\/products\/retro-instruments-2a3","provider":"Wired Tunes","version":"1.0","type":"link"}