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Microphone Preamp

Focusrite ISA 428 MkII 4-Channel Microphone Preamp/Direct Input

Focusrite

AED 7739 inc VAT.

The Focusrite ISA428 MkII is a versatile four-channel microphone preamp with transformer-based preamps, selectable input impedance, and direct instrument inputs. It offers an optional eight-channel analog to digital conversion with high-quality Burr-Brown amplifiers. Known for delivering transparent audio with subtle warmth, it features a broad frequency response and variable impedance for optimal microphone matching. An included Brainworx bx_console Focusrite SC channel-strip plug-in emulates the rare Focusrite Studio Console for a professional sound.

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Description

Focusrite ISA428 MkII Microphone Preamp

The Focusrite ISA428 MkII is a versatile four-channel microphone preamp known for its high-quality transformer-based preamps. Designed to provide both transparency and subtle warmth, it features selectable input impedance, direct instrument inputs, and an optional eight-channel analog to digital conversion. This makes it an ideal choice for professional audio recording, whether in digital or analog domains.

Key Features

  • Four ISA series transformer-based preamps
  • Eight-channel A-D converter (optional)
  • Selectable impedance for microphone matching or creative sound shaping
  • Four front panel instrument inputs
  • Dedicated analog insert points for external processing
  • Accurate LED meters for every channel
  • Brainworx bx_console Focusrite SC channel-strip plug-in included

Specifications

Specification Details
Number of Channels 4
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)
Output 4 x XLR Line (rear panel), 4 x 1/4″ TRS phone Insert Send (rear panel)
Phantom Power +48V individually switchable
Gain Range Microphone: 0dB to +60dB in 10dB steps, plus 0dB to +20dB continuously variable trim, Line: -20dB to +10dB in 10dB steps, plus 0dB to +20dB continuously variable trim, Instrument: +10dB to +40dB continuously variable
Input Impedance Microphone: 600Ω, 1.4kΩ, 2.4kΩ, 6.8kΩ, Line: 10kΩ, Instrument: >1MΩ
Maximum Output Level Microphone: +7.4dBu, Line: +25.4dBu, Instrument: +11.5dBu
Frequency Response Microphone: -0.35dB at 20Hz and -3.0dB at 122kHz (0dB gain), -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), -3.0dB at 20Hz and -3.0dB at 38.4kHz (+40dB gain)
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)
Power Requirements 100VAC~240VAC
Dimensions 19 x 11 x 3.5″ (483 x 279 x 89mm)
Weight 12.2 lbs (5.5kg)
Specialty High Pass Filter: Roll off = 18dB per octave 3 pole filter, Frequency range: 16Hz to 420Hz (continuously variable, measured at the 3.0dB down point)

Additional information

Brand

EAN

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