Soundcraft GB4 40ch 40+4/4/2 GB Series Console

Soundcraft GB4 40ch (40+4/4/2) Mixing Console

The Soundcraft GB4 is a professional analog mixing console that delivers intuitive, responsive control with smooth 100mm faders and tactile potentiometers that make real-time mixing feel natural rather than clinical. Built around GB30 microphone preamplifiers with ultra low-noise floors, this 40-channel workhorse combines warm analog circuitry with the flexible I/O architecture needed for live sound, studio recording, and theater production. The individually-nutted potentiometers mounted to a steel chassis front panel ensure years of reliable performance in demanding professional environments.

Design & Construction

The console measures 1523mm wide × 169mm high × 656mm deep and weighs 37kg, making it a substantial but manageable format for permanent installations or touring applications. Individual vertically-mounted PCBs fitted to the steel chassis front panel with individually-nutted potentiometers provide both durability and the kind of hands-on control that engineering professionals expect from a purpose-built mixing platform.

Channel Architecture & Signal Flow

40 mono input channels (via 1/4" TRS and 3-pin XLR) plus 4 stereo input channels give you flexible source connectivity, while 8 auxiliary sends, 4 stereo returns, 4 group outputs, and a 7×4 output matrix provide routing flexibility for complex mixing scenarios. Direct outputs on all mono channels and insert points on mono inputs, main output, and subgroup outputs allow you to integrate outboard gear seamlessly into your signal chain.

Key Features

• 40 mono input channels with balanced 3-pin XLR and 1/4" TRS connectivity
• 4 stereo input channels with paired L/R inputs
• GB30 microphone preamplifiers with -128dBu E.I.N. (@150Ω source impedance)
• 4-band EQ per channel: High (13kHz, ±15dB shelving), Hi-Mid (550Hz–13kHz, ±15dB), Lo-Mid (80Hz–1.9kHz, ±15dB), Low (80Hz, ±15dB shelving)
• 8 auxiliary sends with 4 stereo returns
• 4 group outputs on balanced 3-pin XLR connectors
• 7×4 output matrix for flexible post-fader mixing
• Individually switched 48V phantom power on every mono input
• Direct outputs on all 40 mono input channels
• Insert points on all mono inputs, main output, and subgroup outputs
• 100mm faders for channel-level control
• Integrated LED and VU meter bridge for input and output metering
• THD+N <0.006% (at mic sensitivity -30dBu, +20dBu output @1kHz)
• Dimensions: 1523mm (W) × 169mm (H) × 656mm (D); Weight: 37kg

The GB4 combines robust analog circuitry with extensive routing options, making it an ideal platform for engineers who need proven reliability, transparent audio quality, and the creative flexibility to handle productions ranging from intimate venues to complex theater productions.