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Focusrite ISA428 MkII 4 Channel Mic Preamp

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16 customer reviews

Four-Channel Mic Preamp Supporting Optional Eight-Channel A-D Converter

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About Focusrite ISA428 MkII 4 Channel Mic Preamp


  • Four ISA series transformer-based preamps: based on Focusrite's classic ISA110 preamplifier design
  • Eight-channel optional A-D converter: four additional A-D converter inputs allow eight channels of high quality conversion, with a dynamic range of 122dB and jitter performance below 250 picoseconds
  • Selectable impedance: four choices of input impedance, including the original ISA 100 value, allow you to match the preamp to your microphone
  • Dedicated analog insert points: switchable insert points on every channel let you route to and from external signal processors such as an EQ or compressor
  • Accurate LED meters for every channel: clear metering designed to catch even the fastest and most elusive of transients


Preamp Type Solid State
Number of Channels 4
Frequency Response 20Hz-122kHz
Phantom Power Yes
Analog Inputs 4 x XLR (Mic), 4 x 1/4" (Line), 4 x 1/4" (Hi-Z), 4 x 1/4" (Returns), 4 x XLR (Aux)
Analog Outputs 4 x XLR, 4 x 1/4" (Sends)
Digital Outputs Optional A/D expansion card available (digital DB25, optical)
Rack Spaces 2U
Height 3.5"
Depth 11"
Width 19"
Weight 12.2 lbs.
Manufacturer Part Number MOIF428MK2
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