About Focusrite ISA Two Microphone Preamp
Focusrite ISA Two microphone preamp brings together a totally independent pair of classic ISA microphone preamps from the original ISA 110 module, combining the best of traditional solid-state electronics with the original input transformer specified by Rupert Neve – the Lundahl LL1538. Each mic pre has the option of mic, line or the front-panel instrument input, with variable input impedance to ensure you are getting the best performance from the source.
Up to 60dB of gain is available on the first four-position rotary and gain range switches, with a further +20dB of continuously variable trim, meaning a huge 80dB of gain is available should it be required. The high-pass filter features variable cut-off frequency between 16 and 420Hz. A pair of 8-segment LED meters show peak signal level in dBFS, while a rear-panel pot allows calibration to suit your A-D converters. Rear-panel insert points allow the use of inline processors such as compression.
Focusrite ISA Two Microphone Preamp Specifications:
MIC INPUT RESPONSE
Gain Range (Mic): 0 dB to 60 dB in 10 dB steps, plus 0 dB to 20 dB continuously variable trim EIN (Mic): Measured at 60 dB of gain with 150 O source impedance and 22 Hz-22 kHz band pass filter -127 dB Noise (Mic): Noise at output with unity gain (0 dB) and 22 Hz-22 kHz band pass filter -97 dBu Frequency Response (Mic): At minimum gain (0 dB)-0.5 dB at 10 Hz,?-1 dB at 135 kHz, relative to 1 kHz At 60 DB Gain (Mic): -6 dB at 10 Hz, -1 dB at 115 kHz, relative to 1 kHz Crosstalk Channel To Channel (Mic): Mic input, with I/P = 0 dBu, gain = 0 dB @ 1 kHz input to channel A, channel B output = -85 dB
LINE INPUT RESPONSE
Gain Range (Line): -20 dB to 10 dB in 10 dB steps, plus 0 dB to 20 dB continuously variable trim Input Impedance (Line): 10 kO from 10 Hz to 200 kHz Frequency Response (Line): At minimum gain (0 dB)-0.3 dB at 10 Hz, -1 dB at 80 kHz, relative to 1 kHz Crosstalk Channel To Channel (Line): Line input, with I/P = 0 dBu, gain = 0dB @ 1 kHz input to channel AChannel B output?= -91 dB
INSTRUMENT INPUT RESPONSE
Gain Range (Instrument): 10 dB to 40 dB continuously variable trim Input Impedance (Instrument): 2 MO Noise (Instrument): Measured with 22 Hz-22 kHz band pass filter Minimum gain ( 10 dB) = -95 dBu Frequency Response (Instrument): At minimum gain ( 10 dB)-0.1 dB at 10 Hz,?-1 dB at 115 kHz, relative to 1 kHz At Maximum Gain ( 40 DB) (Instrument): -2.5 dB at 10 Hz, ?-1 dB at 110 kHz, relative to 1 kHz
Roll-Off: 18 dB per octave (3 pole filter) Frequency Range: Continuously variable from 16 Hz to 420 Hz (-3 dB)
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