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Home  >  Recording  >  Channel Strips & Preamps  >  Microphone Preamps

Focusrite ISA428 MkII - Microphone Preamp

Model: ISA428 MKII

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Specifications

Packaging Info

Package Weight 17.55 lb
Box Dimensions (LxWxH) 25.0 x 18.0 x 9.0"

General Information

Output 4 x XLR Line (rear panel)4 x 1/4" TRS phone Insert Send (rear panel)
Phantom Power +48V individually switchable
Multi Function Has provision for optional analog to digital converter
Gain Range Microphone: 0dB to +60dB in 10dB steps, plus 0dB to +20dB continuously variable trimLine: -20dB to +10dB in 10dB steps, plus 0dB to +20dB continuously variable trimInstrument: +10dB to +40dB continuously variable
Input Impedance Microphone: 600Ω, 1.4kΩ, 2.4kΩ, 6.8kΩLine: 10kΩInstrument: >1MΩ
Maximum Output Level Microphone: +7.4dBuLine: +25.4dBuInstrument: +11.5dBu
Frequency Response Microphone: -0.35dB at 20Hz and -3.0dB at 122kHz (0dB gain) and -2.5dB at 20Hz and -3.0dB at 103kHz (60dB gain)Line: -0.3dB at 20Hz and -3dB at 94kHz (0dB gain)Instrument: -0.2dB at 20Hz and 0dB at 200kHz (+10dB gain) and -3.0dB at 20Hz and -3.0dB at 38.4kHz (+40dB gain)
Number of Channels 4
Noise Microphone: Noise EIN: -126dB (measured at 60dB of gain with 150Ω termination and 20Hz/22kHz bandpass filter) Noise at main output with unity gain: -98dBu (measured with a 20Hz/22kHz bandpass filter) SNR: 123dB (relative to max output 25dBu) SNR: 120dB (relative to 0dBFS (+22dBu) Line: Noise at main output with unity gain: -91dBu (measured with a 20Hz/22kHz bandpass filter) SNR: 116dB (relative to max output 25dBu) SNR: 113dB (relative to 0dBFS +22dBu) Instrument: Noise at main output with minimum gain (+10dB): -95dBu (measured with a 20Hz/22kHz bandpass filter)
CMRR Microphone: 88dB
Meters Each 6-LED meter is calibrated 0dBFS = +22dBu (the maximum level which can be correctly converted by the optional internal A/D converter before overload occurs). The meter calibration points are as follows: Meter panel calibration value in dBFS / Equivalent dBu value: 0dBFS / +22dBu -2dBFS / +20dBu -6dBFS / +16dBu -12dBFS / +10dBu -18dBFS / +4dBu -42dBFS / -20dBu
Power Requirements 100VAC~240VAC
Dimensions (WxDxH) 19 x 11 x 3.5" (483 x 279 x 89mm)
Weight 12.2 lbs (5.5kg)
Specialties High Pass FilterRoll off = 18dB per octave 3 pole filterFrequency range: 16Hz to 420Hz (continuously variable, measured at the 3.0dB down point)
THD + N Microphone: 0.0009% (measured at 1kHz, -20dBu input signal, at 30dB gain setting, with a 20Hz/22kHz bandpass filter)Line: 0.002% (measured with +4dBu input signal, 0dB gain setting, with a 20Hz/22kHz bandpass filter)Instrument: 0.006% (measured with -20dBu input signal, at minimum gain (+10dB), with a 20Hz/22kHz bandpass filter)
Inputs 4 x XLR Microphone (rear panel)4 x 1/4" TS phone Instrument (front panel)4 x 1/4" TRS phone Line (rear panel)4 x 1/4" TRS phone Insert Return (front Panel)4 x XLR ADC Input for optional AD converter card (rear panel)
Product Highlights
  • 4 Channels
  • Transformer Based
  • Selectable Impedance
  • Phantom Power
  • Instrument Inputs
  • Variable High-Pass Filter
  • Per Channel LED Metering
In The Box
  • Focusrite ISA428 MkII - Microphone Preamp
  • AC Power Cable
  • One (1) Year Warranty
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