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Soundcraft GB4 32-channel

Soundcraft GB4 32-channel

Featuring the GB30 Mic preamps and EQ, the GB4 is designed by Graham Blyth for the company’s 30th anniversary.

The desks carry the high quality hallmark with which Soundcraft is synonymous, with engineering and design as you'd expect from this high-end manufacturer. Careful attention has been given to the mechanical construction, to ensure reliability under strenuous conditions, with all input modules being constructed with individual vertically-mounted pcb’s, fitted to the steel chassis front panel with individually-nutted potentiometers.

The GB Series also shares the stylish looks of the MH4, MH3 and LX7ii consoles, continuing a strong family look and feel across the range.

Available in frame sizes from 16 to 40 channels, the GB4 is designed for installations such as churches and performance venues, or for small touring sound systems. The dual-mode topology implemented to such success on the MH3 and MH4 desks allows the GB4 to be used on FOH or monitor duties, with fader control of group or aux outputs.

Although largely conventional in layout, the GB4 does have some unique mechanical features. The rugged steel chassis has a sloping rear connector panel so that it is easier to configure from the front of the desk, while the integral power supply has a link option for an external back-up PSU.

Four mute groups allow several channels to be muted simultaneously, while another unique facility is the limiter on a set of dedicated record outputs that makes it easier to create a stereo recording of the mix.

The console also features an output matrix with seven feeds to four outputs, being fed from the group busses and main L, R and C (mono) outputs.

The GB4 offers a comprehensive set of functions and facilities in a small and cost-effective footprint, and delivers the high performance and reliability you would expect from a Soundcraft product.

More Information

Soundcraft GB4-32 32-channel Analog Mixing Console Features at a Glance:

  • Design style based on the MH console series
  • 32 x mono input channels with GB30 microphone preamps and 4-band GB30 EQ section
  • Direct outputs on every mono channel
  • GB30 preamps and EQ designed by Soundcraft co-founder Graham Blyth (based on the MH3 and MH4 consoles)
  • Dual-mode operation allows configuration as either a FOH or monitor mixer, at the touch of a button
  • 7 x busses (4 subgroups plus left, right, and center main mixes)
  • 8 x auxiliary sends with flexible pre/post switching
  • 4 x mute groups
  • A 7-x-4 matrix allows 4 separate sub-mixes of left, right, center and group outputs
  • 4 segment LED's on each output and 12 segment output meters
  • Internal power supply with external PSU link option

Affordable, portable, and versatile, the Soundcraft GB-24 32-channel live sound mixer is a great choice!

Technical Specification

Soundcraft GB4 32 Channel Analog Mixer Specifications

Frequency Response

  • Mic/Line Input to any output, 20Hz – 20kHz: <1dB

THD + Noise

  • Mic sens. -30dBu, +20dBu at all outputs @1: <0.006%


  • Measured RMS, 22Hz to 22kHz Bandwidth
  • Mic E.I.N. @ unity gain, 150Ω source impedance: -128dBu
  • Mix Output, 32 inputs routed to mix: <-85dBu
  • Group Outputs: <-85dBu
  • Aux Outputs: <-83dBu
  • Matrix Outputs: <-89dBu

Crosstalk (@1kHz, typical)

  • Input Channel Mute: <-93dB
  • Input Fader cut-off: <-92dB
  • Pan isolation: <-70dB
  • Mix route isolation: <-93dB
  • Group route isolation: <-93dB
  • Adjacent channel crosstalk: <-99dB
  • Group to Mix: <-90dB
  • Aux Send pots offness (typical): <-80dB
  • Matrix Send pots offness (typical): <-80dB


  • Typical @ 1kHz: 80dB

Input & Output Max Levels

  • Mono & Stereo Mic Inputs: +15dBu
  • Mono Line Inputs: +30dBu
  • Stereo Line Inputs: +20dBu
  • Insert Returns: +20dBu
  • Any output: +20dBu
  • Nominal Operating Level: 0dBu
  • Headphone Power: 2x250mW into 200Ω

Input & Output Impedances

  • Mic Inputs: 2kΩ
  • Line Inputs and Stereo Returns: 10kΩ
  • Input channels Insert Return: 5kΩ with EQ in, otherwise 3kΩ
  • Mix, Group, Aux, Matrix & Direct outputs: 150Ω
  • Insert sends: 75Ω
  • Recommended Headphone Impedance: 50 – 600Ω

High pass filter (Mono input)

  • 100Hz, 18dB per octave

EQ (Mono input)

  • HF: 13kHz, +/-15dB, 2nd order shelving
  • Hi-Mid: 550Hz-13kHz, +/-15dB, Q=1.5
  • Lo-Mid: 80Hz-1.9kHz, +/-15dB, Q=1.5
  • LF: 80Hz, +/-15dB, 2nd order shelving


  • Input channels (GB4/GB8): Single tri-colour 4-segment LED bargraph
  • Outputs (GB4): 7 tri-colour 12-segment LED bargraphs
  • Outputs (GB8): 11 tri-colour 12-segment LED bargraphs, + Meterpod with 3 VU meters (L/R/C)
  • Outputs (GB2): 2 tri-coloured 12-segment LED bargraphs (indicates monitor source level)

Power consumption

  • AC mains supply (internal PSU): 85V-270V AC, 50/60Hz universal input
  • Power consumption: Less than 150W

Operating Conditions

  • Temperature range: -10ºC to +30ºC
  • Relative humidity: 0% to 80%
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