Soundcraft GB4 High Performance Analog Mixer

Featuring the GB30 Mic preamps and EQ, the GB4 was designed by Graham Blyth for the company’s 30th anniversary. The GB Series shares the stylish looks of the MH4, MH3 and LX7ii consoles, continuing a strong family look and feel across the range.

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 GB4 is designed for installations such as churches and performance venues, or for small touring sound systems. The dual-mode topology implemented 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 expect from a Soundcraft product.

Soundcraft GB4 Features

• Individually switched 48V phantom power on every mono input module
• 8 Aux sends
• 4 Group sends (paired)
• 4 Mute groups
• 7+4 Output Matrix
• Limiter on record output
• GB30 mic pre-amp
• 4-band GB30 EQ
• Integral power supply, with an external power supply link option
• All metal TRS jacks and Neutrik XLRs
• Direct outputs on all mono input channels

• GB4 Analog Mixer1
• Power cable1

• Noise (measured RMS, 22Hz to 22kHz bandwidth)
  • Mic EIN @ Unity Gain, 150W Source Impedance: -128dBu
  • Mix Output, 40 Inputs Routed To Mix: <-82dBu
  • Group Outputs: <-83dBu
  • Aux Outputs: <-80dBu
  • Matrix Outputs: <-89dBu
• Crosstalk (@1kHz, typical)
  • Input Channel Mute: <-97dB
  • Input Fader Cut-Off: <-95dB
  • Pan Isolation: <-77dB
  • Mix Route Isolation: <-97dB
  • Group Route Isolation: <-97dB
  • Adjacent Channel Crosstalk: <-99dB
  • Group to Mix: <-89dB
  • Aux Send Pots Offness (typical): <-84dB
  • Matrix Send Pots Offness (typical): <-89dB
• Frequency Response (mic/line input to any output, 20Hz - 20kHz)<1dB
• THD+N (mic sens. -30dBu, +20dBu at all outputs @1kHz)<0.006%
• CMRR (typical @ 1kHz)80dB
• Input & Output Max. Levels
  • Mono & Stereo Mic Inputs: +15dBu
  • Mono & Stereo Line Inputs: +30dBu
  • Stereo Returns & Insert Returns: +20dBu
  • Any Output: +20dBu
  • Nominal Operating Level: 0dBu
  • Headphone Power: 2x250mW into 200Ω
• Input & Output Impedances
  • Mic Inputs: 2kΩ
  • Line Inputs & 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
• EQ
  • 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
• Weight
  • 16 Channel: 22 kg (48.5 lbs)
  • 24 Channel: 27 kg (59.5 lbs)
  • 32 Channel: 32 kg (70.5 lbs)
  • 40 Channel: 37 kg (81.6 lbs)