About Focusrite ISA One Classic Microphone Preamp
Featuring a rugged, portable all-metal enclosure, Focusrite ISA One classic microphone preamp combines the classic Focusrite microphone preamp with a flexible, independent DI channel and optional 192kHz precision A-D conversion. At the heart of the ISA range is the microphone preamplifier with its Lundahl input transformer – essentially the same circuit, based on the original ISA 110, that has been used for 30 years in successive Focusrite designs. The input transformer imparts a special character to the sound that can’t be truly emulated in any other way, while the modern twist of variable input impedance allows for a new degree of flexibility.
Whether you’re an artist, engineer or producer, you’ll appreciate the versatility of the Focusrite ISA One classic microphone preamp, with its front-panel DI input. The DI includes low/high impedance switching and an amplifier output, and its own feed to the optional A-D converter and separate rear-panel XLR output.
Focusrite ISA One Classic Microphone Preamp Specifications:
MIC INPUT RESPONSE
Gain Range (Mic): 0dB to 60dB in 10dB steps 20 dB of variable gain
EIN (Mic): -126dB measured at 60dB of gain with 150 Ohm terminating impedance and 22Hz/22kHz band-pass filter
Noise (Mic): Noise at output with unity gain (0 dB) and 22 Hz-22 kHz band pass filter-97 dBu
Signal-To-Noise Ratio (Mic): 106 dB relative to max headroom (9dBu)
Frequency Response (Mic): At minimum gain (0 dB)-0.5dB down at 10Hz and -3dB down at 125kHz
CMRR (Mic): 98dB (Channel 1, 1kHz, maximum gain with 24 dBu input)
Crosstalk Channel To Channel (Mic): With 10dB@1kHz input to chA, chB output =104dBrA. With 10dB@10kHz input to chA, chB output = 84dBrA
LINE INPUT RESPONSE
Gain Range (Line): -20dB to 10dB in 10dB steps 20 dB of variable gain
Input Impedance (Line): 10 kO from 10 Hz to 200 kHz
Total Harmonic Distortion Noise (Line): Measured with a 0 dBu input signal, and a 22 Hz-22 kHz band pass filter 0.0001
Frequency Response (Line): At unity gain (0 dB)-0.3dB down at 10Hz and -3dB down at 200kHz
INSTRUMENT INPUT RESPONSE
Gain Range (Instrument): 10dB to 40dB continuously variable
Input Impedance (Instrument): High = greater than 1M Low =greater than 300k
THD (Instrument): At minimum gain ( 10)
Roll-Off: 18 dB per octave (3 pole filter)
Frequency: Fixed 75Hz measured at the 3dB down point
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