{"product_id":"heritage-audio-ha-81a-channel-strip-mic-preamp-eq","title":"Heritage Audio HA-81A Channel Strip with 73-Style Mic Preamp and 81-Style EQ","description":"\u003ch2\u003e\u003cbr\u003e\u003c\/h2\u003e\n\u003c!-- Video Section --\u003e\n\u003cdiv style=\"margin: 20px auto 10px auto; text-align: center; max-width: 800px;\"\u003e\n\u003ch2 style=\"font-size: 20px; margin-bottom: 12px;\"\u003eHeritage Audio HA-81A Connections \u0026amp; Features\u003c\/h2\u003e\n\u003ciframe src=\"https:\/\/www.youtube.com\/embed\/5noyFaNE-Ac?si=t-cqa6Lmlet8wdkl\" style=\"width: 100%; max-width: 800px; height: 450px; display: block; margin: 0 auto; border-radius: 8px;\"\u003e\n  \u003c\/iframe\u003e\n\u003c\/div\u003e\n\u003c!-- Section 1 --\u003e\n\u003cdiv class=\"par-section\"\u003e\n\u003cdiv class=\"par-image\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0646\/4031\/9643\/files\/HeritageAudioHA73X2frontsideview.png?v=1772159798\" alt=\"Heritage Audio HA-81A channel strip mic preamp and EQ front panel\"\u003e\u003c\/div\u003e\n\u003cdiv class=\"par-text\"\u003e\n\u003ch2\u003eTwo Legendary British Circuits. One Channel Strip.\u003c\/h2\u003e\n\u003cp\u003eThe 1073-style preamp and the 1081-style EQ are two of the most revered pieces of British console hardware ever built. They've never been on the same module — until now. The HA-81A puts both in a single channel strip, giving you a fully discrete Class A signal path loaded with Carnhill input and St. Ives output transformers, followed immediately by four bands of inductor-based EQ that's pure 81-style in character and behavior.\u003c\/p\u003e\n\u003cp\u003eThis is a channel strip for engineers who know exactly what they want and don't want to compromise to get it. Track through it, mix on it, or use it as an outboard insert — it delivers the bold, smooth, unmistakably British sound at every gain setting.\u003c\/p\u003e\n\u003cp\u003eAs an authorized dealer, Pro Audio Reserve ensures your HA-81A is a genuine Heritage Audio product backed by full manufacturer warranty and support.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c!-- Section 2 --\u003e\n\u003cdiv class=\"par-section reverse\"\u003e\n\u003cdiv class=\"par-image\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0646\/4031\/9643\/files\/HeritageAudioHA81Atopview.png?v=1772159597\" alt=\"Heritage Audio HA-81A rackmount 73-style preamp 81-style EQ\"\u003e\u003c\/div\u003e\n\u003cdiv class=\"par-text\"\u003e\n\u003ch2\u003eFour Bands. Thirty Frequencies. Inductor-Based Character.\u003c\/h2\u003e\n\u003cp\u003eThe EQ section follows classic 81-style inductor-based topology — the same circuit approach responsible for that creamy, musical response that engineers have been reaching for on mix buses and individual tracks for decades. High and low shelves handle the broad tonal picture, while two bell filters cover the midrange with precision. Shelf-to-bell switching on both bands gives you even more shaping options, and with 30 total frequency selections across the four bands, you have surgical flexibility without ever losing that smooth vintage character.\u003c\/p\u003e\n\u003cp\u003eHigh-pass and low-pass filters round out the EQ section, with the HPF sweeping from 27Hz to 270Hz and the LPF covering 3.9kHz to 15kHz — wide enough to handle everything from cleaning up a muddy room mic to rolling off harsh top end on a bright source.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c!-- Section 3 --\u003e\n\u003cdiv class=\"par-section\"\u003e\n\u003cdiv class=\"par-image\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0646\/4031\/9643\/files\/HeritageAudioHA81Afrontview.png?v=1772159607\" alt=\"Heritage Audio HA-81A rear panel XLR I\/O connections\"\u003e\u003c\/div\u003e\n\u003cdiv class=\"par-text\"\u003e\n\u003ch2\u003eEverything You Need to Track Any Source, Any Session\u003c\/h2\u003e\n\u003cp\u003eDedicated XLR mic and line inputs on the rear keep your patch bay clean, while the front-panel 1\/4\" DI handles instruments directly without any additional boxes in the chain. Up to 80dB of gain on the mic preamp means ribbons, dynamics, and low-output condensers all get the headroom they need.\u003c\/p\u003e\n\u003cp\u003e48V phantom power, polarity reverse, pad, and Lo-Z impedance switching cover every microphone scenario you'll encounter in a working session. An external dedicated power supply keeps the internal signal path completely free of noise — a detail that matters most when you're pushing the preamp hard into transformer saturation territory.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003ch3\u003eHighlights\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eSingle-channel strip combining a 73-style discrete Class A preamp with a 4-band 81-style inductor EQ\u003c\/li\u003e\n\u003cli\u003eCarnhill input and St. Ives output transformers for classic British transformer tone and character\u003c\/li\u003e\n\u003cli\u003e30 selectable EQ frequencies across four bands with shelf-to-bell switching on high and low bands\u003c\/li\u003e\n\u003cli\u003eSweepable HPF (27–270Hz) and LPF (3.9–15kHz) for precise frequency management\u003c\/li\u003e\n\u003cli\u003eFront-panel DI, 80dB of mic gain, 48V phantom, pad, polarity reverse, and Lo-Z impedance switching\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eHeritage Audio HA-81A Specifications\u003c\/h3\u003e\n\u003ctable style=\"width: 100%; border-collapse: collapse; border: 1px solid #ccc;\"\u003e\n\u003cthead\u003e\n\u003ctr style=\"background-color: #f2f2f2;\"\u003e\n\u003cth style=\"text-align: left; padding: 10px; border: 1px solid #ccc; width: 35%;\"\u003eSpecification\u003c\/th\u003e\n\u003cth style=\"text-align: left; padding: 10px; border: 1px solid #ccc;\"\u003eDetails\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ccc;\"\u003e\u003cstrong\u003eType\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ccc;\"\u003eSingle-Channel Strip — Mic Preamp and 4-Band EQ\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: #fafafa;\"\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ccc;\"\u003e\u003cstrong\u003eGain Range\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ccc;\"\u003e80dB\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ccc;\"\u003e\u003cstrong\u003eEQ Bands\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ccc;\"\u003e4 (2 x shelf, 2 x bell) with shelf-to-bell switching\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: #fafafa;\"\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ccc;\"\u003e\u003cstrong\u003eHigh Shelf\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ccc;\"\u003e3.3kHz – 15kHz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ccc;\"\u003e\u003cstrong\u003eHigh Bell\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ccc;\"\u003e1.5kHz – 8.2kHz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: #fafafa;\"\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ccc;\"\u003e\u003cstrong\u003eLow Bell\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ccc;\"\u003e220Hz – 1.2kHz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ccc;\"\u003e\u003cstrong\u003eLow Shelf\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ccc;\"\u003e33Hz – 330Hz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: #fafafa;\"\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ccc;\"\u003e\u003cstrong\u003eHigh Pass Filter\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ccc;\"\u003e27Hz – 270Hz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ccc;\"\u003e\u003cstrong\u003eLow Pass Filter\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ccc;\"\u003e3.9kHz – 15kHz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: #fafafa;\"\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ccc;\"\u003e\u003cstrong\u003eMic Input\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ccc;\"\u003e1 x XLR (rear)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ccc;\"\u003e\u003cstrong\u003eLine Input\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ccc;\"\u003e1 x XLR (rear)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: #fafafa;\"\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ccc;\"\u003e\u003cstrong\u003eDI Input\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ccc;\"\u003e1 x 1\/4\" (front panel)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ccc;\"\u003e\u003cstrong\u003eOutput\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ccc;\"\u003e1 x XLR\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: #fafafa;\"\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ccc;\"\u003e\u003cstrong\u003ePower\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ccc;\"\u003eDedicated external power supply (included)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003eWhat's in the Box\u003c\/h3\u003e\n\u003ctable style=\"width: 100%; border-collapse: collapse; border: 1px solid #ccc;\"\u003e\n\u003cthead\u003e\n\u003ctr style=\"background-color: #f2f2f2;\"\u003e\n\u003cth style=\"text-align: left; padding: 10px; border: 1px solid #ccc;\"\u003eIncluded Items\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ccc;\"\u003eHeritage Audio HA-81A Channel Strip\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: #fafafa;\"\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ccc;\"\u003eDedicated External Power Supply\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ccc;\"\u003eUser Documentation\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e","brand":"Heritage Audio","offers":[{"title":"Default Title","offer_id":48062814978203,"sku":null,"price":1249.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0646\/4031\/9643\/files\/HeritageAudioHA81Afrontview.png?v=1772254814","url":"https:\/\/proaudioreserve.com\/products\/heritage-audio-ha-81a-channel-strip-mic-preamp-eq","provider":"Pro Audio Reserve","version":"1.0","type":"link"}