Description
The Allen & Heath Qu-SB is an ultra-compact 18-in/14-out digital mixer designed for live performances and portable studio setups. Featuring 16 AnalogiQ recallable preamps and high-quality 24-bit converters, it delivers transparent, low-noise sound from input to output. Four stereo iLive FX engines provide professional reverb, delay, and modulation effects, while the integrated Qu-Drive USB recorder captures multitrack performances without a computer. Automatic Mic Mixer (AMM) manages multiple open microphones, reducing feedback and background noise for clear speech. With full USB interface compatibility, it supports recording, streaming, and DAW control, while the Qu-Pad app allows wireless mixing from anywhere in the venue. Built from rugged steel with fanless design, the Qu-SB ensures reliable, silent operation for touring bands, conferences, and live events.

Compact Mixing Anywhere
Qu-SB’s ultra-portable design allows you to mix from anywhere in the venue without being tied to a fixed console. It provides a smart, flexible solution for performing bands and artists while maintaining professional sound quality. Its compact form factor makes it easy to transport and set up quickly.

AnalogiQ Preamps
Sixteen AnalogiQ digitally controlled preamps deliver ultra-low noise and superb transparency from input to output, using zero-crossing detection and a padless 1 dB-step gain stage. This ensures clean, detailed audio with minimal distortion. The preamps are matched with 24-bit A/D and D/A converters for high-fidelity sound.

USB Recording & Streaming
Qu-SB features Qu-Drive, an integrated multitrack USB recorder for 18-channel 48kHz/24-bit recording and playback directly from USB drives or hard disks. The USB interface streams audio to Mac or PC, supporting all inputs, FX returns, and stereo mixes. It is compatible with major DAWs and enables effortless live streaming.

FX & Automatic Mic Mixing
Four stereo RackFX engines provide high-quality effects including classic reverbs, gated reverbs, delays, and modulators on dedicated return channels. The Automatic Mic Mixer (AMM) balances up to 16 microphones, reducing feedback and background noise. Together, they ensure polished live mixes with minimal manual intervention.
- 16 Mic/Line Inputs
- 16 Recallable AnalogiQ Preamps
- 12 Mix Outputs
- 32×32 USB Recording Interface
- 4 Built-In FX Engines
- iPad App for Wireless Mixing
- EQ & Dynamics on Each Input and Output
- RTA with Peak Band Indicator
- Up to 38 Inputs via dSNAKE
Number of Analog Input Channels: 16
Mix Routing: 4x Stereo FX Return
Groups:
4x Mute Group
4x DCA Group
Meter Range: -48 to -3 dBFS Peak/Clip (+19 dBu at XLR Output)
Meter Calibration: 0 dB on Meter = -18 dBFS (+4 dBu at XLR Output)
Gain/Trim Range:
Line: ±24 dB (Stereo Channels)
Mic/Line: -5 dB to +60 dB (in 1 dB Steps)
Input Polarity: Normal/Reverse
Gate Parameters:
Threshold: -72 to +18 dBu
Depth: 0 to 60 dB
Attack: 50 μs to 300 ms
Hold: 10 ms to 5 sec
Release: 10 ms to 1 sec
Compressor Parameters:
Threshold: -46 to 18 dBu
Ratio: 1:1 to ∞:1
Attack: 300 μs to 300 ms
Release: 100 ms to 2 sec
Knee: Soft / Hard
EQ: FX Returns: 4-Band Parametric
EQ Parameters:
1x HF Shelf: ±15 dB at 20 Hz to 20 kHz (Shelf or Bell Selectable)
2x MF Notch/Peak: ±15 dB at 20 Hz to 20 kHz
1x LF Shelf: ±15 dB at 20 Hz to 20 kHz (Shelf or Bell Selectable)
Graphic EQ: 28-Band 1/3 Octave, ±12 dB 31 Hz to 16 kHz
Filters: High-Pass: 20 Hz to 20 kHz, 12 dB/Octave
Channel Output/Source Monitoring: AFL, PFL, Post-Preamp, Post-EQ, Post-FX
Built-In Effects:
Reverb
Delay
Reverb (Gated)
ADT
Chorus
Phaser
Flanger
Real Time Analyzer: 31-Band 1/3 Octave, 20 Hz to 20 kHz
Audio Delay: Adjustable Up to 170 ms
Sample Rates:
48 kHz
Stereo Record: 48 kHz
Stereo Playback: 44.1 / 48 kHz
Multitrack Record: 48 kHz
Multitrack Playback: 48 kHz
Bit Depth:
AD/DA Conversion: 24-Bit Delta Sigma
Stereo Record: 24-Bit
Stereo Playback: 16 / 24-Bit
Multitrack Record: 24-Bit
Multitrack Playback: 24-Bit
Latency:
1.2 ms (Mic Input to XLR Output)
0.7 ms (Mic Input to AES Output)
dBFS Reference Level: +18 dBu = 0 dBFS
Headroom: +18 dB
Frequency Response: 20 Hz to 20 kHz +0/-0.5 dB
Max Input Level:
Mic Input: +19 dBu
Line Input: +29 dBu
Aux Input:
+22 dBu (+4 dBu)
+18 dBu (0 dBu)
Output Level:
Aux Output:
+22 dBu (2901653168)
+4 dBu (2901653169)
Line Output:
+22 dBu (2901653168)
+4 dBu (2901653169)
Analog Dynamic Range: 112 dB
I/O Impedance:
Aux Input: > 7 Kilohms
Aux Output: < 75 Ohms
XLR Line Output: < 75 Ohms
XLR Mic/Line Input: > 5 Kilohms
1/4″ Mic/Line Input: > 10 Kilohms
Noise Floor: -90 dBu (with Inputs Muted)
THD+N:
Mic/Line Input:
0.0005% at Unity Gain
0.001% at +30 dB Gain
Signal Generator: Sine, White, Pink, or Band-Pass Noise (Assignable to Any Mix)
Analog Inputs:
1x XLR Talkback Input
16x XLR Balanced Mic Input
16x 1/4″ TRS Balanced Line Input
2x 1/4″ TRS Balanced Aux Input (1 Stereo Pair, Half-Normalled)
Analog Outputs:
10x XLR Balanced Mix Output
2x XLR Balanced Main Output
2x 1/4″ TRS Balanced Output (1 Stereo Pair)
Digital I/O:
1x RJ45 (Network)
1x etherCON dSNAKE (I/O)
USB I/O:
1x USB-A (External Memory)
1x USB-B 2.0 (Audio Streaming)
Max Multitrack Recording: 18 Tracks
Input Power: 100 to 240 VAC, 50 / 60 Hz
Power Consumption: 150 W (Maximum)
Rackmount Size: 4 U
Operating Temperature: 32 to 95°F / 0 to 35°C
Dimensions:
17.1 x 6.9 x 6.3″ / 435.5 x 174.5 x 161 mm (Desk-Mounted)
19 x 5.3 x 7″ / 483 x 135.4 x 177 mm (Rack-Mounted)
Weight: 12.7 lb / 5.8 kg















