{"product_id":"focusrite-isa-828","title":"Focusrite ISA 828 8-Channel Mic Preamp","description":"\u003cp\u003eThe \u003cspan style=\"font-weight: bold;\"\u003eFocusrite ISA828\u003c\/span\u003e eight channel microphone pre-amplifier, providing eight original ISA transformer-based pre amps in a single robust 2u chassis, offering the Focusrite signature sound at its lowest cost per channel to date. \u003cbr\u003e\u003cbr\u003e The eight ISA-series transformer-based microphone pre amps, with switchable impedance and direct instrument inputs, are complemented by eight line inputs, eight line outputs and an optional eight-channel 192kHz ADC.  Thanks to its convenient 25-pin D-Type connectors, the ISA828 integrates quickly and seamlessly with ProTools HD, as well as other popular hard disc recorders and mixing desks. \u003cbr\u003e\u003cbr\u003e The microphone input stage includes a variable impedance circuit, allowing the user to switch between four carefully selected input impedance settings.  The original ISA 110 setting is supplemented by three further impedance settings to either perfectly match the pre amp with any microphone, thus maximizing level, or to use different settings creatively to shape the sound of the microphone being used. \u003cbr\u003e\u003cbr\u003e The four front panel instrument inputs also feature high and low impedance options to provide a comprehensive and accessible DI solution. Insert points are also featured on every channel, should the need arise to place extra processing between the pre amp and converter, Vintage design high pass filters are also provided on every channel, ideal for eliminating unwanted low frequencies without affecting the rest of the audio signal.   The ISA 828's new optional eight-channel 192kHz ADC is the first audio ADC to utilise Texas Instruments Burr-Brown Pro Audio Amplifiers and Flagship Analog to Digital Converter PCM4220 chips.  This cutting-edge technology is encompassed within Focusrite's own custom analogue circuitry to provide eight channels of unparalleled A\/D conversion, delivering a dynamic range of 122dB and jitter at \u0026lt; 250 picoseconds. \u003cbr\u003e\u003cbr\u003e Finally, every channel features a six LED input meter, complete with precise meter trim.  Metering has been designed to utilise the same reference points as Digidesign's HD system and provides clear and accurate input metering independent of the DAW.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eMic Input Response \u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eGain range: 0dB to 60dB in 10dB steps \u003c\/li\u003e\n\u003cli\u003e Input Impedance, variable: 600?, 1k4?, 2k4?, 6k8? \u003c\/li\u003e\n\u003cli\u003eEIN (equivalent input noise): -126dB measured at 60dB of gain with 150 Ohm terminating impedance and 22Hz\/22kHz bandpass filter\u003c\/li\u003e\n\u003cli\u003e Noise at main output with gain at unity (0dB): -97dBu measured with a 22Hz\/22kHz bandpass filter\u003c\/li\u003e\n\u003cli\u003e Signal to noise ratio relative to max headroom (9dBu): 106dB \u003c\/li\u003e\n\u003cli\u003e THD at medium gain (30dB): 0.0008% measured with a 1kHz -20dBu input signal and with a 22Hz\/22kHz bandpass filter\u003c\/li\u003e\n\u003cli\u003e Frequency response at minimum gain (0dB): -0.5dB down at 10Hz and –3dB down at 110kHz \u003c\/li\u003e\n\u003cli\u003eFrequency response at maximum gain (60dB): –3dB down at 16Hz and –3dB down 85kHz\u003c\/li\u003e\n\u003cli\u003e CMRR: 91.8dB (Channel 1, 1kHz, maxiumum gain)\u003c\/li\u003e\n\u003cli\u003e Crosstalk Channel to Channel: with 10dB@1kHz input to chA, chB output =102dBrA. With 10dB@10kHz input to chA, chB output = 84dBrA\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eLine Input Response \u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eGain range: -20dB to +10dB in 10dB steps\u003c\/li\u003e\n\u003cli\u003e Input Impedance: 10k? from 10Hz to 200kHz\u003c\/li\u003e\n\u003cli\u003e Noise at main output with gain at unity (0dB): -96dBu measured with a 22Hz\/22kHz bandpass filter \u003c\/li\u003e\n\u003cli\u003eSignal to noise ratio relative to max headroom (24dBu): 120dB \u003c\/li\u003e\n\u003cli\u003eSignal to noise ratio relative to 0dBFS(+22dBu): 118dB\u003c\/li\u003e\n\u003cli\u003e THD at unity gain (0dB): 0.001% measured with a 0dBu input signal and with a 22Hz\/22kHz bandpass filter\u003c\/li\u003e\n\u003cli\u003e Frequency Response at unity gain (0dB): 0.3dB down at 10Hz and –3dB down at 122kHz \u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eInstrument Input Response\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e Gain range: 10dB to 40dB continuously variable •\tInput Impedance: 1M? or 300k? \u003c\/li\u003e\n\u003cli\u003eNoise at minimum gain (+10dB): -90dBu measured with a 22Hz\/22kHz bandpass filter\u003c\/li\u003e\n\u003cli\u003e Noise at maximum gain (+40dB): -62dBu measured with a 22Hz\/22kHz bandpass filter\u003c\/li\u003e\n\u003cli\u003e THD at minimum gain (+10dB): 0.002% measured with a 10dBu input signal and with a 22Hz\/22kHz bandpass filter\u003c\/li\u003e\n\u003cli\u003e Frequency Response at 10dB gain with -10dB input: 10Hz-200kHz +\/- 0.6dB \u003c\/li\u003e\n\u003cli\u003eFrequency Response at 40dB gain with -40dB input: -2.5dB down at 10Hz and 0dB at 200kHz \u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eHigh Pass Filter \u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eRoll off: 18dB per octave 3 pole filter\u003c\/li\u003e\n\u003cli\u003e Fixed Frequency 75Hz measured at the 3dB down point \u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eWeight\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e 19.5Ibs \u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eDimensions \u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e 484mm (W) x 85mm (H) x 305mm (D) (350mm depth with heat sink) 19\" (W) x 3.5\" (H) x 12\" (D) (13.8\" depth with heat sink)\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Focusrite","offers":[{"title":"Default Title","offer_id":44449243136103,"sku":"9263","price":2699.99,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0658\/8848\/5479\/files\/focusrite_isa828_1.jpg?v=1787088282","url":"https:\/\/vintageking.com\/products\/focusrite-isa-828","provider":"Vintage King","version":"1.0","type":"link"}