Focusrite ISA 828 8 Channel Microphone Preamp
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Eight ISA series transformer-based preamps
In a single robust 2U chassis, offering the classic Focusrite pre at its lowest cost-per-channel to date.
Optional eight-channel 192kHz A-D converter
Embodies cutting edge conversion technology, incorporating Focusrite analogue circuitry to deliver the best A-D performance on the market, bar none.
Interface easily with Pro Tools and other systems
With convenient 25-pin D-type connectors, ISA 828 integrates quickly and seamlessly with Pro Tools | HD, as well as other popular hard disk recorders and mixing systems.
Direct instrument inputs
Each instrument input features high and low impedance options to provide a comprehensive and accessible DI solution.
Inserting available on every channel
Allows external devices to be inserted between the preamp and the A-D converter, using the 25-pin D-type cable.
Selectable per channel; choose one of four carefully selected input impedances, including the original ISA110 setting, to suit any microphones.
High pass filter, polarity reverse and phantom power
Each has a dedicated switch, independent on each channel.
Six LED input meter
Complete with precise meter trim - designed to utilise the same reference points as Pro Tools | HD.
Eight Lundahl LL1538 mic input transformers
The original mic transformer used in the original Red modules helps to provide the unique sound and performance of this groundbreaking design.
|Gain range||0 dB to 60 dB in 10 dB steps|
|Input Impedance||Variable, 600, 1k4, 2k4, 6k8|
|EIN (equivalent input noise)||-126 dB measured at 60 dB of gain with 150 Ohm terminating impedance and 22 Hz / 22 kHz bandpass filter|
|Noise at main output with gain at unity (0 dB)||-97 dBu measured with a 22 Hz / 22 kHz bandpass filter|
|Signal to noise ratio relative to max headroom (9dBu)||106 dB|
|THD at medium gain (30dB)||0.0008% measured with a 1 kHz -20 dBu input signal and with a 22 Hz / 22 kHz bandpass filter|
|Frequency response at minimum gain (0 dB)||-0.5 dB down at 10 Hz and 3 dB down at 110kHz|
|Frequency response at maximum gain (60 dB)||3 dB down at 16 Hz and 3 dB down 85 kHz|
|CMRR||91.8 dB (Channel 1, 1 kHz, maxiumum gain)|
|Crosstalk Channel to Channel||With 10 dB @ 1 kHz input to chA, chB output = 102 dBrA. With 10 dB @ 10 kHz input to chA, chB output = 84 dBrA|
|Gain range||-20 dB to +10 dB in 10 dB steps|
|Input Impedance||10 k from 10 Hz to 200 kHz|
|Noise at main output with gain at unity (0 dB)||-96 dBu measured with a 22 Hz / 22 kHz bandpass filter|
|Signal to noise ratio relative to max headroom (24 dBu)||120 dB|
|Signal to noise ratio relative to 0dBFS(+22dBu)||118dB|
|THD at unity gain (0dB)||0.001% measured with a 0 dBu input signal and with a 22 Hz / 22 kHz bandpass filter|
|Frequency Response at unity gain (0dB)||0.3 dB down at 10 Hz and 3 dB down at 122 kHz|
|Gain range||10 dB to 40 dB continuously variable|
|Input Impedance||1 M or 300 k|
|Noise at minimum gain (+10 dB)||-90 dBu measured with a 22 Hz / 22 kHz bandpass filter|
|Noise at maximum gain (+40 dB)||-62 dBu measured with a 22 Hz / 22 kHz bandpass filter|
|THD at minimum gain (+10 dB)||0.002% measured with a 10 dBu input signal and with a 22 Hz / 22 kHz bandpass filter|
|Frequency Response at 10 dB gain with -10 dB input||10 Hz - 200 kHz +/- 0.6 dB|
|Frequency Response at 40 dB gain with -40 dB input||-2.5 dB down at 10 Hz and 0 dB at 200 kHz|
|Roll off||18 dB per octave 3 pole filter|
|Frequency||Fixed 75Hz measured at the 3dB down point|
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