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Focusrite ISA428 MkII 4-channel Microphone Preamplifier

SKU: FRISA428MK2 MFR: ISA428MK2
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Key Features

  • Capture pristine audio with Focusrite's low noise microphone preamplifier.
  • Achieve flexible sound shaping using variable impedance control for mics.
  • Expand your studio with four channels of high-quality microphone preamps.
  • Enjoy a wide gain range, perfect for any microphone and sound source.
  • Integrate seamlessly with balanced inputs/outputs on this channel strip.
  • Experience superior build quality for reliable studio and stage use.
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Focusrite ISA428 MKII Specifications

  • Mic Inputs: Frequency response

    -0.35dB at 20Hz and -3dB at 122kHz at min gain (0dB)
    -2.5dB at 20Hz and -3dB 103kHz at max gain (60dB)

  • Mic Inputs: Gain range

    0dB to +60dB in 10dB steps, plus 0dB to +20dB continuously variable trim

  • Mic Inputs: Maximum headroom

    +7.4dBu

  • Mic Inputs: THD+N

    0.0009% (measured at 1kHz -20dBu input signal, at 30dB gain setting, with a 20Hz/22kHz bandpass filter)

  • Mic Inputs: Noise EIN

    -126dB (measured at 60dB of gain with 150 Ohms termination and 20Hz/22kHz bandpass filter)

  • Mic Inputs: Noise at main output

    -98dBu (measured with a 20Hz/22kHz bandpass filter) with unity gain

  • Mic Inputs: SNR

    123dB (relative to max output 25dBu)
    120dB (relative to 0dBFS (+22dBu)

  • Mic Inputs: CMRR

    88dB

  • Mic Inputs: Impedance, variable

    600 Ohms , 1400 Ohms , 2400 Ohms , 6800 Ohms

  • Line Inputs: Frequency Response

    -0.3dB at 20Hz and -3dB at 94kHz at unity gain (0dB)

  • Line Inputs: Gain range

    -20dB to +10dB in 10dB steps, plus 0dB to +20dB continuously variable trim

  • Line Inputs: Maximum headroom

    +25.4dBu

  • Line Inputs: THD+N

    0.002% (measured with +4dBu input signal, 0dB gain setting, with a 20Hz/22kHz bandpass filter)

  • Line Inputs: Noise at main output

    -91dBu (measured with a 20Hz/22kHz bandpass filter) with unity gain

  • Line Inputs: SNR

    116dB (relative to max output 25dBu)
    113dB (relative to 0dBFS +22dBu). Input Impedance: 10kOhms

  • Instrument Inputs: Frequency Response

    at +10dB gain: -0.2dB at 20Hz and 0dB at 200kHz
    at +40dB gain: -3dB at 20Hz and -3dB at 38.4kHz

  • Instrument Inputs: Gain range

    +10dB to +40dB continuously variable

  • Instrument Inputs: Maximum headroom

    +11.5dBu

  • Instrument Inputs: THD+N

    0.006% (measured with -20dBu input signal, at minimum gain (+10dB), with a 20Hz/22kHz bandpass filter)

  • Instrument Inputs: Noise at main output

    -95dBu (measured with a 20Hz/22kHz bandpass filter) with minimum gain (+10dB)

  • Instrument Inputs: Input Impedance

    = >1MOhms

  • High Pass Filter

    Roll off = 18dB per octave 3 pole filter
    Frequency range: 16Hz to 420Hz (continuously variable, measured at the 3dB down point)

  • Analogue Channel Inputs (Inputs 1-4)

    4x instrument 1/4" TS jack inputs on front panel
    4x microphone XLR inputs on rear panel
    4x line 1/4" TRS jacks on rear panel
    4x insert return 1/4" TRS jacks on rear panel
    4x ADC XLR inputs on rear panel

  • Analogue Audio Outputs (Outputs 1-4)

    4x line XLR outputs on rear panel
    4x insert send 1/4" TRS jacks on rear panel

  • Other I/O

    IEC power input connector 100Vac - 240Vac

  • Front Panel Indicators

    8x output meters, 6 segment
    4x 30-60 mic gain range selection indicator
    4x +48V phantom power indicator
    4x Phase indicator
    4x Insert In indicator
    4x Filter In indicator
    4x Input selection indicators (Mic, Line, Inst)
    4x Z In microphone input impedance selection indicators (Low, ISA110, Med, High) Clock select indicators (44.1, 48, 88.2, 96, 176.4, 192)
    Ext clock indicators (Lock, Word clock, 256X)

  • Dimensions (W x H x D)

    19 x 3.5 x 11" / 482.6 x 88.9 x 279.4mm

  • Weight

    5.5kg / 12.12lbs

  • UPC Code

    815301005124

About Focusrite ISA428 MKII

From the esteemed house of Focusrite, the ISA428 MkII 4-channel Microphone Preamplifier is a high-quality, professional-grade audio equipment designed for the discerning recording professional. This advanced preamplifier is a testament to Focusrite's commitment to superior audio quality and engineering excellence, a reputation built over 25 years.

The ISA428 MkII is a versatile and durable preamplifier, featuring the same classic circuitry and renowned audio quality that made the original a favorite among audio professionals. It offers four of the prestigious ISA series transformer-based preamps, known for their outstanding transparency and subtle warmth contributed by transformer core saturation. These preamps have been the producers' choice on countless hit records over the last two decades.

This advanced microphone preamplifier comes with selectable input impedance, allowing users to perfectly match the preamp with any microphone or creatively shape the sound of the microphone using different settings. One of these settings includes the 'Vintage ISA110', providing the original Focusrite signature sound.

The ISA428 MkII also features direct instrument inputs and an optional eight channels of high-quality analogue to digital conversion. With four additional inputs, you can route other line signals through the converter. The four front panel instrument inputs allow for quick and easy connection, eliminating the need for a separate DI box.

This preamplifier also boasts dedicated analogue insert points on every channel, allowing for extra processing between preamp and conversion. The variable high-pass Focusrite filter provided on every channel is the same as featured on the original ISA428.

Finally, the ISA428 MkII is equipped with accurate six-segment LED metering on every channel, designed to catch even the fastest transients. Whether you're looking to preserve the sound of your classic microphones or searching for the perfect front end for your digital studio, the ISA428 MkII is a versatile and reliable choice.

Focusrite ISA428 MKII Features

  • Professional-grade 4-channel microphone preamplifier with classic Focusrite circuitry
  • Selectable input impedance including 'Vintage ISA110' for signature sound customization
  • Four front panel instrument inputs for direct, DI box-free connections
  • Optional eight-channel high-quality A-D conversion for expanded recording capabilities
  • Dedicated analogue insert points on each channel for additional external processing
  • Accurate six-segment LED metering on each channel to monitor transient signals

Product Documents

User Manual

Key Features

  • Capture pristine audio with Focusrite's low noise microphone preamplifier.
  • Achieve flexible sound shaping using variable impedance control for mics.
  • Expand your studio with four channels of high-quality microphone preamps.
  • Enjoy a wide gain range, perfect for any microphone and sound source.
  • Integrate seamlessly with balanced inputs/outputs on this channel strip.
  • Experience superior build quality for reliable studio and stage use.

What's in the box:

  • Focusrite ISA428 MkII 4-channel Microphone Preamp
  • AC Power Cable
  • Focusrite 2 Year Warranty