Allen & Heath QU-SB 18-In / 14-Out Portable Digital Mixer

The Allen & Heath Qu-SB is an ultra-compact digital mixer designed for maximum flexibility and portability. Featuring 18 inputs and 14 outputs, it integrates seamlessly with a suite of companion apps for wireless control from anywhere in the venue. Ideal for live performers, AV professionals, and rental companies, Qu-SB includes powerful onboard effects, multitrack USB recording, and plug-and-play expandability via dSNAKE. AnalogiQ™ preamps, a robust FX engine, and support for the ME Personal Mixing System ensure top-tier sound and versatility. With intuitive routing, virtual soundcheck options, and ProFactory mic presets, Qu-SB offers all the tools needed for streamlined setup and performance in a rugged, portable form.

Features

Ultra-compact wireless digital mixer for live and install use

18 onboard inputs, 14 outputs, expandable to 32x24 via dSNAKE

Fully remote-controllable via Qu-Pad, Qu-Control, and Qu-You apps

Loaded with iLive-derived FX and AnalogiQ™ preamps

USB multitrack and stereo recording/playback

Advanced processing and internal FX engines

Compatible with ME Personal Mixing System and DAWs

Specifications

General
Mains Power: 100–240V AC, 50/60Hz
Maximum Power Consumption: 150W
Operating Temperature Range: 0°C to 35°C

Inputs
Mic/Line Inputs: Balanced, XLR and 1/4" TRS jack, fully recallable
Input Sensitivity (XLR / TRS): -60 to +5dBu / -50 to +15dBu
Analogue Gain: -5 to +60dB, 1dB steps
Maximum Input Level (XLR / TRS): +19dBu / +29dBu
Input Impedance (XLR / TRS): >5kΩ / >10kΩ
THD+N, Unity Gain 0dB: 0.0005% -89 dBu (20Hz–20kHz)
THD+N, Mid Gain +30dB: 0.001% -83 dBu (20Hz–20kHz)

Stereo Line Inputs
ST1, ST2 Connector: Balanced, 1/4" TRS jack, half-normalled
ST3 Connector: Unbalanced stereo 3.5mm mini jack
Input Sensitivity (ST1, ST2 / ST3): +4dBu / 0dBu
Trim: ±24dB
Maximum Input Level (ST1, ST2 / ST3): +22dBu / +18dBu
Input Impedance: >7kΩ

Outputs
Mix1-10 and LR Out: Balanced XLR
Output Impedance: <75Ω
Nominal Output: +4dBu
Maximum Output Level: +22dBu
Residual Output Noise: -90 dBu
Stereo Alt Out & 2Trk Out: Balanced 1/4" TRS jack
AES Digital Output: 2 channel, 48kHz, XLR, 2.5Vpp balanced, 110Ω

dSNAKE
Inputs: Remote source for CH1-32, ST1-3
Outputs: Patchable from Mix1-10, LR, Grp1-8, MTX1-4
Compatibility: AR2412, AR84, AB168 AudioRacks, ME Personal Mixing
Latency: 1.2 ms (XLR in to XLR out), 0.7 ms (XLR in to AES out)
Sampling Rate: 48kHz ±100PPM
ADC/DAC: 24-bit Delta-Sigma
Dynamic Range: 112 dB
Frequency Response: +0/-0.5dB 20Hz–20kHz
Headroom: +18dB

USB Audio
Qu-Drive: USB A
Stereo Record: 2 channel WAV, 48kHz, 24-bit
Stereo Playback: WAV, 44.1 or 48kHz, 16 or 24-bit
Multitrack Record/Playback: 18 channel, 48kHz, 24-bit
USB Audio Streaming (USB B): 32x32 channels, WAV, 48kHz, 24-bit

Control
SoftKeys: 10
Mute Groups: 4
DCA Groups: 4
Network: TCP/IP Ethernet for MIDI and app control

Input Processing
Source: Local, dSNAKE, or USB (ST1-ST3, CH1–32)
Polarity: Normal/Reverse
HPF: 12dB/octave, 20Hz–2kHz
Insert: FX1-4 assignable
Delay: Up to 85ms
Gate: Sidechain, Threshold -72dBu to +18dBu
PEQ: 4-band fully parametric, ±15dB, 20Hz–20kHz
Compressor: Threshold -46dBu to +18dBu, Soft/Hard knee, 4 types

Mix Processing
Direct Out to USB: Configurable source
Insert: FX assignable
Delay: Up to 170ms
GEQ: 28-band, 1/3 octave, ±12dB
PEQ: 4-band fully parametric
Compressor: Self-key sidechain, 4 types

FX
Internal FX: 4 RackFX engines
Types: Reverb, Delay, Gated Reverb, Chorus, Flanger, ADT, etc.
FX Returns: 4 stereo, routable to Mix/LR

Audio Tools
PAFL: PFL or AFL, Trim -24dB, Delay 85ms
Talkback: Assignable, 12dB/oct HPF
Signal Generator: Sine/White/Pink/Band-pass Noise
RTA: 31-band, 1/3 octave, follows PAFL source

Physical & Dimensions
Width: 435.5 mm
Depth: 174.5 mm
Height: 161 mm
Weight: 5.7 kg