Focusrite ISA428 High Grade Mic Preamp

SKU: ISA428-MKII Categories: , ,

The Focusrite ISA428 is a high grade 4-channel microphone pre-amp developed by Rupert Neve to deliver a clean and warm sound. Capable of support a range of signal types including mic, line, and more. Perfect for professional studio environments


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Now in its second generation, the ISA 428 Mk II incorporates four of Focusrite’s renowned mic pres in a simple-to-operate 2U enclosure, placing four mic preamps, instrument inputs and line ins at your fingertips. The original Focusrite mic pre was designed to suit the microphones of the time; today’s model makes one small change, adding three additional input impedances to the classic ISA110 setting, allowing you to match any microphone, old or new, and access a wide range of sounds, from the character and warmth of a vintage mic to the clear transparency of a modern design. Or you can experiment and bring out just the qualities you want.

  • Four ISA series transformer-based preamps
  • Eight-channel optional A-D converter
  • Selectable impedance (low, ISA 110, Med, High
  • 48V Phantom Power
  • Supports instrument, line, and send/return inputs
  • Variable High-Pass Filter
  • LED metering per channel


Frequency Response: 10Hz – 135kHz
Input Impedance: Selectable;
Low = 600 Ω
ISA 110 = 1.4 kΩ
Med = 2.4 kΩ
High = 6.8 kΩ
Inputs: 4x 1⁄4″ Jack (inst), 4x XLR (mic), 4 x1⁄4″ TRS Jacks (line), 4x 1⁄4″ TRS Jacks (returns), 4x ADC XLR
Outputs: 4x XLR, 4x 1/4&quot TRS Jacks (sends)
Signal-to-Noise Ratio (mic): 123dB (relative to max output 25dBu)
THD: >0.0009% at 1kHz (mic)
Dimensions: 480 x 88 x 280 mm
Weight: 5.5 kg
For more information, please visit the manufacturer's website.