{"product_id":"focusrite-isa428-mkii-4-channel-microphone-preamplifier","title":"Focusrite ISA428 MkII 4-Channel Microphone Preamplifier","description":"\u003cp data-path-to-node=\"4\"\u003e\u003cmeta charset=\"UTF-8\"\u003e\u003cmeta charset=\"UTF-8\"\u003e\u003cspan\u003eThe \u003c\/span\u003e\u003cb data-path-to-node=\"4\" data-index-in-node=\"4\"\u003eFocusrite ISA428 MkII\u003c\/b\u003e\u003cspan\u003e consolidates four channels of legendary, transformer-based console preamplification into a single 2U rackmount unit. Built around four historic Lundahl LL1538 input transformers, this powerhouse deliver up to \u003c\/span\u003e\u003cb data-path-to-node=\"4\" data-index-in-node=\"235\"\u003e\u003cspan class=\"math-inline\" data-math=\"80\\text{ dB}\" data-index-in-node=\"235\"\u003e\u003cspan class=\"katex\"\u003e\u003cspan class=\"katex-html\" aria-hidden=\"true\"\u003e\u003cspan class=\"base\"\u003e\u003cspan class=\"strut\"\u003e\u003c\/span\u003e\u003cspan class=\"mord\"\u003e80\u003c\/span\u003e\u003cspan class=\"mord text\"\u003e\u003cspan class=\"mord\"\u003e dB\u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e of clean, low-noise analog gain\u003c\/b\u003e\u003cspan\u003e per channel. Perfect for tracking full drum setups, multi-mic acoustic instruments, or live ensembles.\u003c\/span\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp data-path-to-node=\"4\"\u003e\u003cmeta charset=\"UTF-8\"\u003eEach channel features a four-position impedance selector switch allowing you to tailor how your microphone interacts with each Lundahl transformer.\u003c\/p\u003e\n\u003cp data-path-to-node=\"8\"\u003e\u003cmeta charset=\"UTF-8\"\u003e\u003cmeta charset=\"UTF-8\"\u003e\u003cspan\u003eTo streamline modern tracking sessions, channels 1–4 feature dedicated front-panel instrument DIs, making it easy to plug in bass guitars, guitars, or synthesizers directly. For those looking to expand their digital connectivity, the ISA428 MkII supports an optional, premium 8 channel A-D converter card. This allows you to patch processing gear into the rear analog inserts and feed clean digital signals directly to your DAW, or use the converter's four extra line inputs to route auxiliary outboard preamps straight to your interface.\u003c\/span\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp data-path-to-node=\"9\"\u003e\u003cstrong\u003eKey Features\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli data-path-to-node=\"9\"\u003e\n\u003cb data-path-to-node=\"10,0,0\" data-index-in-node=\"0\"\u003eQuad Lundahl LL1538 Transformers:\u003c\/b\u003e Classic, industry-standard input transformers that deliver the signature warm low end and airy top end of historic ISA consoles.\u003c\/li\u003e\n\u003cli data-path-to-node=\"9\"\u003e\n\u003cb data-path-to-node=\"10,1,0\" data-index-in-node=\"0\"\u003eUp to 80dB of Linear Gain:\u003c\/b\u003e Delivers plenty of clean, transparent headroom to comfortably power low-output ribbon, dynamic, or condenser microphones.\u003c\/li\u003e\n\u003cli data-path-to-node=\"9\"\u003e\n\u003cb data-path-to-node=\"10,2,0\" data-index-in-node=\"0\"\u003eFront-Panel Instrument DIs:\u003c\/b\u003e Four high-impedance (\u003cspan class=\"math-inline\" data-math=\"2\\text{ M}\\Omega\" data-index-in-node=\"49\"\u003e\u003cspan class=\"katex\"\u003e\u003cspan class=\"katex-html\" aria-hidden=\"true\"\u003e\u003cspan class=\"base\"\u003e\u003cspan class=\"strut\"\u003e\u003c\/span\u003e\u003cspan class=\"mord\"\u003e2\u003c\/span\u003e\u003cspan class=\"mord text\"\u003e\u003cspan class=\"mord\"\u003e M\u003c\/span\u003e\u003c\/span\u003e\u003cspan class=\"mord\"\u003eΩ\u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e) TS inputs allow you to track direct instruments effortlessly without external boxes.\u003c\/li\u003e\n\u003cli data-path-to-node=\"9\"\u003e\n\u003cb data-path-to-node=\"10,3,0\" data-index-in-node=\"0\"\u003eVariable High-Pass Filters:\u003c\/b\u003e Fully adjustable from \u003cspan class=\"math-inline\" data-math=\"16\\text{ Hz}\" data-index-in-node=\"50\"\u003e\u003cspan class=\"katex\"\u003e\u003cspan class=\"katex-html\" aria-hidden=\"true\"\u003e\u003cspan class=\"base\"\u003e\u003cspan class=\"strut\"\u003e\u003c\/span\u003e\u003cspan class=\"mord\"\u003e16\u003c\/span\u003e\u003cspan class=\"mord text\"\u003e\u003cspan class=\"mord\"\u003e Hz\u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e to \u003cspan class=\"math-inline\" data-math=\"420\\text{ Hz}\" data-index-in-node=\"66\"\u003e\u003cspan class=\"katex\"\u003e\u003cspan class=\"katex-html\" aria-hidden=\"true\"\u003e\u003cspan class=\"base\"\u003e\u003cspan class=\"strut\"\u003e\u003c\/span\u003e\u003cspan class=\"mord\"\u003e420\u003c\/span\u003e\u003cspan class=\"mord text\"\u003e\u003cspan class=\"mord\"\u003e Hz\u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e with a steep \u003cspan class=\"math-inline\" data-math=\"18\\text{ dB}\" data-index-in-node=\"93\"\u003e\u003cspan class=\"katex\"\u003e\u003cspan class=\"katex-html\" aria-hidden=\"true\"\u003e\u003cspan class=\"base\"\u003e\u003cspan class=\"strut\"\u003e\u003c\/span\u003e\u003cspan class=\"mord\"\u003e18\u003c\/span\u003e\u003cspan class=\"mord text\"\u003e\u003cspan class=\"mord\"\u003e dB\u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e\/octave slope to eliminate unwanted rumble and low-end buildup.\u003c\/li\u003e\n\u003cli data-path-to-node=\"9\"\u003e\n\u003cb data-path-to-node=\"10,4,0\" data-index-in-node=\"0\"\u003eDedicated Rear Analog Inserts:\u003c\/b\u003e Balanced TRS loop sends and returns on every channel let you easily patch in external outboard compressors, limiters, or EQs.\u003c\/li\u003e\n\u003cli data-path-to-node=\"9\"\u003e\n\u003cb data-path-to-node=\"10,5,0\" data-index-in-node=\"0\"\u003eClear 6-Segment LED Metering:\u003c\/b\u003e High-resolution LED meters provide quick, precise visual feedback of input levels across all four channels.\u003c\/li\u003e\n\u003cli data-path-to-node=\"9\"\u003e\n\u003cb data-path-to-node=\"10,6,0\" data-index-in-node=\"0\"\u003eOptional 8-Channel A-D Card:\u003c\/b\u003e Supports an optional high-performance conversion card (Dante, AES3, and ADAT) utilizing four additional line inputs for extra external gear.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-path-to-node=\"9\"\u003e\u003cstrong\u003eSpecifications\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli data-path-to-node=\"13,0,0\"\u003e\n\u003cb data-path-to-node=\"13,0,0\" data-index-in-node=\"0\"\u003ePreamplifier Type:\u003c\/b\u003e Solid State with Quad Lundahl LL1538 Input Transformers\u003c\/li\u003e\n\u003cli data-path-to-node=\"13,1,0\"\u003e\n\u003cb data-path-to-node=\"13,1,0\" data-index-in-node=\"0\"\u003eChannel Count:\u003c\/b\u003e 4 Channels (Quad-mono tracking)\u003c\/li\u003e\n\u003cli data-path-to-node=\"13,2,0\"\u003e\n\u003cb data-path-to-node=\"13,2,0\" data-index-in-node=\"0\"\u003eMaximum Gain:\u003c\/b\u003e Up to \u003cspan class=\"math-inline\" data-math=\"80\\text{ dB}\" data-index-in-node=\"20\"\u003e\u003cspan class=\"katex\"\u003e\u003cspan class=\"katex-html\" aria-hidden=\"true\"\u003e\u003cspan class=\"base\"\u003e\u003cspan class=\"strut\"\u003e\u003c\/span\u003e\u003cspan class=\"mord\"\u003e80\u003c\/span\u003e\u003cspan class=\"mord text\"\u003e\u003cspan class=\"mord\"\u003e dB\u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e (Mic) \/ Up to \u003cspan class=\"math-inline\" data-math=\"28\\text{ dB}\" data-index-in-node=\"47\"\u003e\u003cspan class=\"katex\"\u003e\u003cspan class=\"katex-html\" aria-hidden=\"true\"\u003e\u003cspan class=\"base\"\u003e\u003cspan class=\"strut\"\u003e\u003c\/span\u003e\u003cspan class=\"mord\"\u003e28\u003c\/span\u003e\u003cspan class=\"mord text\"\u003e\u003cspan class=\"mord\"\u003e dB\u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e (Instrument DI)\u003c\/li\u003e\n\u003cli data-path-to-node=\"13,3,0\"\u003e\n\u003cb data-path-to-node=\"13,3,0\" data-index-in-node=\"0\"\u003eVariable Impedance Settings:\u003c\/b\u003e Low (\u003cspan class=\"math-inline\" data-math=\"600\\ \\Omega\" data-index-in-node=\"34\"\u003e\u003cspan class=\"katex\"\u003e\u003cspan class=\"katex-html\" aria-hidden=\"true\"\u003e\u003cspan class=\"base\"\u003e\u003cspan class=\"strut\"\u003e\u003c\/span\u003e\u003cspan class=\"mord\"\u003e600\u003c\/span\u003e\u003cspan class=\"mspace\"\u003e \u003c\/span\u003e\u003cspan class=\"mord\"\u003eΩ\u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e), ISA 110 (\u003cspan class=\"math-inline\" data-math=\"1,400\\ \\Omega\" data-index-in-node=\"57\"\u003e\u003cspan class=\"katex\"\u003e\u003cspan class=\"katex-html\" aria-hidden=\"true\"\u003e\u003cspan class=\"base\"\u003e\u003cspan class=\"strut\"\u003e\u003c\/span\u003e\u003cspan class=\"mord\"\u003e1\u003c\/span\u003e\u003cspan class=\"mpunct\"\u003e,\u003c\/span\u003e\u003cspan class=\"mspace\"\u003e\u003c\/span\u003e\u003cspan class=\"mord\"\u003e400\u003c\/span\u003e\u003cspan class=\"mspace\"\u003e \u003c\/span\u003e\u003cspan class=\"mord\"\u003eΩ\u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e), Medium (\u003cspan class=\"math-inline\" data-math=\"2,400\\ \\Omega\" data-index-in-node=\"81\"\u003e\u003cspan class=\"katex\"\u003e\u003cspan class=\"katex-html\" aria-hidden=\"true\"\u003e\u003cspan class=\"base\"\u003e\u003cspan class=\"strut\"\u003e\u003c\/span\u003e\u003cspan class=\"mord\"\u003e2\u003c\/span\u003e\u003cspan class=\"mpunct\"\u003e,\u003c\/span\u003e\u003cspan class=\"mspace\"\u003e\u003c\/span\u003e\u003cspan class=\"mord\"\u003e400\u003c\/span\u003e\u003cspan class=\"mspace\"\u003e \u003c\/span\u003e\u003cspan class=\"mord\"\u003eΩ\u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e), High (\u003cspan class=\"math-inline\" data-math=\"6,800\\ \\Omega\" data-index-in-node=\"103\"\u003e\u003cspan class=\"katex\"\u003e\u003cspan class=\"katex-html\" aria-hidden=\"true\"\u003e\u003cspan class=\"base\"\u003e\u003cspan class=\"strut\"\u003e\u003c\/span\u003e\u003cspan class=\"mord\"\u003e6\u003c\/span\u003e\u003cspan class=\"mpunct\"\u003e,\u003c\/span\u003e\u003cspan class=\"mspace\"\u003e\u003c\/span\u003e\u003cspan class=\"mord\"\u003e800\u003c\/span\u003e\u003cspan class=\"mspace\"\u003e \u003c\/span\u003e\u003cspan class=\"mord\"\u003eΩ\u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e)\u003c\/li\u003e\n\u003cli data-path-to-node=\"13,4,0\"\u003e\n\u003cb data-path-to-node=\"13,4,0\" data-index-in-node=\"0\"\u003eHigh-Pass Filter:\u003c\/b\u003e Variable \u003cspan class=\"math-inline\" data-math=\"16\\text{ Hz -- }420\\text{ Hz}\" data-index-in-node=\"27\"\u003e\u003cspan class=\"katex\"\u003e\u003cspan class=\"katex-html\" aria-hidden=\"true\"\u003e\u003cspan class=\"base\"\u003e\u003cspan class=\"strut\"\u003e\u003c\/span\u003e\u003cspan class=\"mord\"\u003e16\u003c\/span\u003e\u003cspan class=\"mord text\"\u003e\u003cspan class=\"mord\"\u003e Hz – \u003c\/span\u003e\u003c\/span\u003e\u003cspan class=\"mord\"\u003e420\u003c\/span\u003e\u003cspan class=\"mord text\"\u003e\u003cspan class=\"mord\"\u003e Hz\u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e (\u003cspan class=\"math-inline\" data-math=\"18\\text{ dB}\" data-index-in-node=\"58\"\u003e\u003cspan class=\"katex\"\u003e\u003cspan class=\"katex-html\" aria-hidden=\"true\"\u003e\u003cspan class=\"base\"\u003e\u003cspan class=\"strut\"\u003e\u003c\/span\u003e\u003cspan class=\"mord\"\u003e18\u003c\/span\u003e\u003cspan class=\"mord text\"\u003e\u003cspan class=\"mord\"\u003e dB\u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e per octave slope)\u003c\/li\u003e\n\u003cli data-path-to-node=\"13,5,0\"\u003e\n\u003cb data-path-to-node=\"13,5,0\" data-index-in-node=\"0\"\u003eAnalog Inputs (Rear):\u003c\/b\u003e 4x XLR Microphone Inputs, 4x TRS Balanced Line Inputs\u003c\/li\u003e\n\u003cli data-path-to-node=\"13,6,0\"\u003e\n\u003cb data-path-to-node=\"13,6,0\" data-index-in-node=\"0\"\u003eAnalog Inputs (Front):\u003c\/b\u003e 4x TS Unbalanced Instrument DI Inputs\u003c\/li\u003e\n\u003cli data-path-to-node=\"13,7,0\"\u003e\n\u003cb data-path-to-node=\"13,7,0\" data-index-in-node=\"0\"\u003eAnalog Outputs:\u003c\/b\u003e 4x XLR Balanced Line Outputs\u003c\/li\u003e\n\u003cli data-path-to-node=\"13,8,0\"\u003e\n\u003cb data-path-to-node=\"13,8,0\" data-index-in-node=\"0\"\u003eHardware Inserts:\u003c\/b\u003e 4x TRS Sends, 4x TRS Returns (1\/4\" balanced, switchable per channel)\u003c\/li\u003e\n\u003cli data-path-to-node=\"13,9,0\"\u003e\n\u003cb data-path-to-node=\"13,9,0\" data-index-in-node=\"0\"\u003eOptional Conversion Expansion:\u003c\/b\u003e Focusrite ISA 8-Channel A-D Card (Adds 4x DB-25 line-level return inputs)\u003c\/li\u003e\n\u003cli data-path-to-node=\"13,10,0\"\u003e\n\u003cb data-path-to-node=\"13,10,0\" data-index-in-node=\"0\"\u003eChassis Format:\u003c\/b\u003e 2U Standard 19\" Rackmount\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Focusrite","offers":[{"title":"Default Title","offer_id":56766425104770,"sku":"FF-ISA-428-MK2","price":624.17,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0521\/1648\/8370\/files\/ISA_428MKII_Front.jpg?v=1784037463","url":"https:\/\/makenoiseproaudio.com\/products\/focusrite-isa428-mkii-4-channel-microphone-preamplifier","provider":"Make Noise Pro Audio","version":"1.0","type":"link"}