Allen & Heath QU-24C Digital Mixing Console
by Allen & Heath

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Allen & Heath QU-24C Digital Live PA Mixer
Now in a feature-packed new Chrome Edition, Qu-24 reshapes digital mixing, combining innovative design and exceptional functionality to create a superb professional mixing experience. Bristling with all the features you’d expect from a top of the range digital console and incorporating technologies pioneered on the GLD and iLive digital mixing systems, Qu-24 has the power and pedigree to deliver class-leading audio performance.

Qu series features include multitrack recording direct to USB, Automatic Mic Mixing, ProFactory mic presets, plus an ever growing ecosystem of apps, accessories and remote I/O.

Whether you’re switching from analogue or updating your digital desk, it’s time to experience the new digital with Qu-24

Qu provides much more than just a mixer. Qu is an entire ecosystem with Remote AudioRacks allowing I/O to be placed where it’s needed, ME Personal Mixers expanding monitor mixes and enabling simple, time-saving local control, Qu Apps for complete remote setup and wireless mixing on stage or anywhere else in the venue, ProFactory Mic presets to speed up preparation time and ensure the best sound, plus USB recording and DAW integration for powerful workflow optimisation from one centrepiece device.

Qu-24 features twenty-four AnalogiQTM digitally controlled preamps with advanced zero-crossing detection and a padless 1dB-step gain stage, which have been closely allied to the DSP for optimal gain accuracy and audio transparency. The analogue signal is captured by high-class, low latency 24bit analogue to digital converters, and are matched to 24bit digital to analogue converters to deliver the required high quality output. The AnalogiQTM preamp design has been refined to offer superb transparency, minimal distortion and an ultra-low noise floor, with a warm, musical sound that is missing from some digital consoles.

Having massive processing power and advanced functionality counts for nothing if you can’t access the controls you need in a heartbeat. The 800×480, True Colour Touchscreen and its dedicated rotary encoder form the heart of Qu-24’s interface, providing super-fast access to all settings and parameters. Dedicated keys and screen tabs quickly guide you to meter and RTA views, FX racks, channel processing, USB audio control, scenes, setup menus and much more. Complementing the touchscreen is the SuperStrip – a set of single function physical controls for instant access to gain, HPF, 4 band PEQ, gate, compressor, GEQ and pan. The screen overview also follows the control being turned.

Qu-24 has a fader per mono input channel and fewer fader layers for simpler, quicker workflow. Some digital mixers don’t offer a fader per physical input, meaning you have to access an additional fader layer to control these channels. This can be confusing and time consuming. Because every mic input is presented on its own fader for fast, easy control, this makes Qu-24 the perfect mixer for first-time converts from analogue to digital and those not comfortable working with several layers of faders.

True digital mixing is about being able to save and recall Scenes (snapshots) at the press of a button. Qu can store up to 100 full Scenes for recall and Channels or Mixes can be made Safe from being overwritten. Qu-24 features 25 motorized ALPS faders, 24 allow instant access to all input channels and masters over 2 layers, and a dedicated master fader dynamically follows the Mix selection. A third User-defined Custom layer is available for ad-hoc strip layout, where any combination of Inputs, FX Sends, FX Returns, DCA’s and Mix masters can be assigned.

Qu-24 has an integrated multitrack USB recorder, providing 18 channels of 48kHz, 24bit recording and playback straight to / from your USB key or hard drive. Capturing multitrack recordings of your shows has never been so easy. A selectable stereo pair can be recorded alongside the 16 Mono channels, and multitrack audio can be played back to the 16 Mono inputs plus ST1. On top of this, Qu-Drive also provides stereo recording patchable from any pair of Mix outputs, the Main LR (pre, post, or summed to mono) or even the PAFL bus, with 2- track stereo playback to ST3.

Qu-24’s built-in audio interface streams up to 32 selectable tracks to your Mac or PC and returns from the computer can be easily assigned to the Input channels. The interface is class-compliant on Mac OS X making it truly plug ‘n play and will be recognized straight away by any DAW supporting Core Audio, including Logic, Cubase, Reaper, and Pro Tools. An ASIO and WDM compatible driver is available for Windows computers. Standard MIDI control is tunnelled over the USB connection so you can map the faders to the tracks of your favourite DAW. A DAW Control driver is available for easy setup and emulation of HUI or Mackie Control protocols on Mac OS X and Windows systems.

Qu-24 is equipped with 5 cores of high efficiency ARM core processing, with dedicated ARM cores running the touchscreen display and surface, USB streaming, Qu-Drive multi-channel USB recording / playback, Ethernet and fader automation. Between them the ARM cores provide state-of-the-art processing, working in parallel to deliver extensive control, instant-on operation, and lightning-fast response.

The mixer’s DSP farm exploits next generation dual core DSPs. The Qu DSP architecture employs varied bit depths, tailored to specific algorithms, with 48 bits on critical EQ functions and a 56 bit accumulator on the mix bus where it really counts, allowing every nuance of the audio to be captured in the final mix.

Made from 18 gauge, cold-rolled Zintec steel, Qu’s distinctive frame is designed for strength and rigidity. We’ve done unspeakable things to that chassis in the lab and it’s taken everything we’ve thrown at it – even being stomped on by our resident ex-tank commander!

Silence is a precious commodity in the live or studio environment, which is why nobody wants those moments of stillness ruined by whirring coming from the mix position. Qu’s sleek profile generates optimal airflow through the mixer, eliminating the need for any fans.

Allen & Heath QU-24C Digital Live PA Mixer
  • 24 mono Mic/Line channels
  • 3 stereo Line channels
  • 32 sources to the mix
  • 12 mixes (4 mono, 3 stereo, LR)
  • 4 FX with 4 FX send buses
  • 10 assignable SoftKeys
  • 4 Mute Groups
  • 32 out, 30 in USB streaming
  • 2 stereo Groups
  • 2 stereo Matrix
  • Extra stereo outputs -- AES digital, Alt Out, 2TRK out
  • Talkback mic input
  • dSNAKE for remote audio using an AR2412 or AR84 AudioRack
  • AnaLOGIQ™ total recall analogue preamps
  • Effects ported from the flagship iLive console
  • Dedicated stereo FX return channels
  • Master strip for quick access to mix levels and processing
  • Input channel linking for stereo sources
  • Input processing -- Preamp, HPF, Gate, PEQ, Compressor, Delay
  • Output processing -- PEQ, Graphic EQ, Compressor, Delay
  • 800x480 pixel colour touch screen for quick control
  • Motorised faders for sends on faders, GEQ fader flip and mix recall
  • Quick copy and reset of settings and scenes
  • 100 Scene memories
  • Scene Recall Filter and channel Safes
  • Channel processing User Libraries
  • Qu-Drive for stereo and 18-track recording/playback to USB hard drive
  • USB streaming to/from an Apple® Mac computer (PC not supported)
  • MIDI DAW Control driver for Mac (converts to HUI or Mackie Control)
  • USB transfer of Scenes, Libraries, Shows
  • User assignable Custom Layer
  • Qu-Pad wireless remote app for iPad
  • Compatible with the Allen & Heath ME personal mixing system
  • User Permissions to restrict operator access (Not available in V1.3)

Allen & Heath QU-24C Digital Live PA Mixer
  • Mic/Line 1-24: Balanced, XLR and 1/4" TRS jack, fully recallable
  • Mic Input Sensitivity (XLR / TRS): -60 to +10dBu / -50 to +20dBu
  • Mic Analogue Gain: -10 to +60dB, 1dB steps
  • Mic Maximum Input Level (XLR / TRS): +19dBu / +29dBu
  • Mic Input Impedance (XLR / TRS): >5kOhms / >10 kOhms
  • Mic THD+N, Unity gain 0 dB: 0.0005% -89 dBu (20-20kHz, Direct Out @0dBu 1kHz)
  • Mic THD+N, Mid gain +30dB: 0.001% -83dBu (20-20kHz, Direct Out @0dBu 1kHz)
  • ST1, ST2 connector: Balanced, 1/4" TRS jack, half normalled
  • ST3 connector: Unbalanced, 3.5mm Mini Jack
  • Stereo Input Sensitivity (ST1, ST2 / ST3): Nominal +4dBu / 0dBu
  • Stereo Trim: +/-24dB
  • Stereo Maximum Input Level (ST1,ST2 / ST3): +22dBu / +18dBu
  • Stereo Input Impedance: >7kOhms
  • Mix1-10 and LR Out, Grp1-4, MTX1-4: Balanced, XLR
  • Output Impedance: <75Ohms
  • Nominal Output: +4dBu = 0dB meter reading
  • Maximum Output Level: +22dBu
  • Residual Output Noise: -91 dBu (muted, 20-20kHz)
  • Stereo Alt Out & 2Trk Out: Balanced, 1/4" TRS jack
  • Source (Alt Output / 2Trk Output): Patchable / LR post-fade
  • Output Impedance: <75Ohms
  • Nominal Output: +4dBu = 0dB meter reading
  • Maximum Output Level: +22dBu
  • Residual Output Noise: -91 dBu (muted, 20-20kHz)
  • AES Digital Output: 2 channel, 48kHz sampling rate, XLR. 2.5Vpp balanced terminated 110Ohms
  • dSNAKE Inputs: Remote source for CH1-24, ST1, ST2, ST3
  • dSNAKE Outputs: Remote outputs for Mix1-10, LR. Compatible with AudioRacks AR2412, AR84. Commpatible with ME personal mixing system
  • System: Measured balanced XLR in to XLR out, 0dB gain, 0dBu input
  • Dynamic Range: 112 dB
  • Frequency Response: +0/-0.5dB 20Hz to 20kHz
  • Headroom: +18dB
  • Internal operating Level: 0dBu
  • dBFS Alignment: +18dBu = 0dBFS (+22dBu at XLR output)
  • Meter Calibration: 0dB meter = -18dBFS (+4dBu at XLR out)
  • Meter Peak indication: -3dBFS (+19dBu at XLR out), multi-point sensing
  • Meter Signal indication: -48dBFS (-26dBu at XLR out)
  • Meter Type: Fast (peak) response
  • Sampling Rate: 48kHz +/-100PPM
  • ADC, DAC: 24-bit Delta-Sigma
  • Latency: 1.2 ms (local XLR in to XLR out). 0.7 ms (local XLR in to AES out)
  • Operating Temperature Range: 0 deg C to 35 deg C (32 deg F to 95 deg F)
  • Mains Power: 100-240V AC, 50/60Hz, 82W max (Qu-16), 120W
  • USB Audio Qu-Drive: USB A
  • USB Audio Device: Use a USB hard drive (not a USB key)
  • USB Audio Stereo Record: 2 channel, WAV, 48kHz, 24-bit, patchable
  • USB Audio Stereo Playback: 2 channel, WAV, 44.1 or 48kHz, 16 or 24-bit, to ST3
  • Multitrack Record: 18 channel, WAV, 48kHz, 24-bit, patchable
  • Multitrack Playback: 18 channel, WAV, 48kHz, 24-bit
  • USB Audio Streaming: USB B, Core Audio compliant
  • Send (upstream): 24/32 channel, WAV, 48kHz, 24-bit
  • Return (downstream): 22/30 channel, WAV, 48kHz, 24-bit
  • Faders: 100mm motorised
  • Touch Screen: 5" TFT, 800x480 resolution
  • SoftKeys: 10
  • Mute Groups: 4
  • Network: TCP/IP Ethernet for MIDI and iPad app
  • Input Processing ST1, ST2: Local, dSNAKE, or USB
  • Input Processing ST3: Local, dSNAKE, or USB
  • Input Processing USB Global Source: Qu-Drive or USB B Streaming
  • Input Stereo Linking: Odd/even input pairs
  • Input Parameters linked: EQ, dynamics, insert, delay, assignments, sends
  • Input Link options: Preamp, polarity, sidechains, fader/mute, pan
  • Input Polarity: Normal/Reverse
  • Input High Pass Filter: 12dB/octave 20Hz -- 2kHz
  • Input Insert: Assign FX into Input channels
  • Input Delay: Up to 85ms
  • Input Gate: Self key Sidechain
  • Input Threshold / Depth: -72dBu to +18dBu / 0 to 60dB
  • Input Attack / Hold / Release: 50us to 300ms / 10ms to 5s / 10ms to 1s
  • Input PEQ: 4-Band fully parametric, 20-20kHz, +/-15dB
  • Input Band 1: Selectable LF Shelving (Baxandall), Bell
  • Input Band 2, Band 3: Bell
  • Input Band 4: Selectable HF Shelving (Baxandall), Bell
  • Input Bell Width: Non-constant Q, variable, 1.5 to 1/9th octave
  • Input Compressor: Self key Sidechain
  • Input Threshold / Ratio: -46dBu to 18dBu / 1:1 to infinity
  • Input Attack / Release: 300us -- 300ms / 100ms - 2s
  • Input Knee: Soft/Hard
  • Input Types: Peak Manual, RMS Manual, SlowOpto, PunchBag
  • Input Channel Direct Out to USB: Follow Fader, follow Mute (global options)
  • Input Source select (global): Post-Preamp, Pre-EQ, Post-EQ, Post-Delay
  • Mix Insert: Assign FX into Mix channels
  • Mix Delay: Up to 170ms
  • Mix GEQ: Constant 1/3 oct, 28 bands 31Hz-16kHz, +/-12dB Gain
  • Mix PEQ: 4-Band fully parametric, 20-20kHz, +/-15dB
  • Mix Band 1: Selectable LF Shelving (Baxandall), Bell
  • Mix Band 2, Band 3: Bell
  • Mix Band 4: Selectable HF Shelving (Baxandall), Bell
  • Mix Bell Width: Non-constant Q, variable, 1.5 to 1/9th octave
  • Mix Compressor: Self key Sidechain
  • Mix Threshold / Ratio: -46dBu to 18dBu / 1:1 to infinity
  • Mix Attack / Release: 300us -- 300ms / 100ms - 2s
  • Mix Knee: Soft/Hard
  • Mix Types: Peak Manual, RMS Manual, SlowOpto, PunchBag
  • Internal FX: 4x RackFX engine, Send>Return or Inserted
  • FX Types: Reverbs, Delays, Gated Reverb, ADT, Chorus, Symphonic Chorus, Phaser, Flanger
  • 4 dedicated Stereo FX returns: Fader, Pan, Mute, Routing to Mix/LR, 4-Band PEQ
  • PAFL: PFL or stereo in-place AFL, 0 to -24dB Trim, 85ms Delay
  • Talkback: Assignable to any mix, 12dB/oct HPF
  • Signal Generator: Assignable to any mix, Sine / White/Pink/Bandpass Noise
  • RTA: 31-Bands 1/3 octave 20-20kHz, follows PAFL source
  • Dimensions Desk mounted: 632 x 500 x 186 mm (24.9" x 19.7" x 7.4")
  • Dimensions Packed in shipping box: 670 x 790 x 350 mm (26.4" x 31.1" x 13.8")
  • Unpacked weight: 14 kg (31 lbs)
  • Packed weight: 18 kg (40 lbs)

Allen & Heath QU-24C Digital Live PA Mixer
(1) Allen & Heath QU-24 Digital Mixer
(1) US IEC Power Cord
(1) Safety Sheets
(1) Operator's Instructions