Used Allen & Heath QU-24 24 Channel Rackmountable Digital Mixer, 20Hz-20kHz Frequency Response, 75Ohms Output Impedance, 112dB Dynamic Range

SKU: US1796212

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Allen & Heath QU-24 Specifications

  • Mic/Line Inputs

    24x Balanced combo XLR/TRS jacks, fully recallable
    Input Sensitivity: -60 to +10 dBu (XLR), -50 to +20 dBu (TRS)
    Analog Gain: -10 to +60 dB, 1 dB steps
    Maximum Input Level: +19 dBu (XLR), +29 dBu (TRS)
    Input Impedance: >5kOhms (XLR), >10kOhms (TRS)
    THD+N, Unity Gain 0 dB: 0.0005%, -89 dBu (20 Hz to 20 kHz, direct out 0dBu, 1 kHz)
    THD+N, Mid Gain +30 dB: 0.001%, -83dBu 20 Hz to 20 kHz, direct out 0dBu, 1 kHz)

  • Stereo Line Inputs

    ST1, ST2 Connector: Balanced, 1/4" (6.3 mm) TRS Jack, half-normalled
    ST3 Connector: Unbalanced 1/8" (3.5 mm) mini jack
    Input Sensitivity (ST1, ST2, ST3): +4 dBu/0 dBu, nominal
    Trim: +/-24 dB
    Maximum Input Level (ST1, ST2, ST3): +22 dBu/+18 dBu
    Input Impedance: >7kOhms

  • Line Outputs

    Mix 1 to 10, GRP 1 to 4, MTX 1 to 4, LR Out: Balanced XLR
    Output Impedance: <75 Ohms
    Nominal Output: +4 dBu = 0 dB meter reading
    Maximum Output Level: +22 dBu
    Residual Output Noise: -90 C31 dBu (muted, 20 Hz to 20 kHz)

  • Stereo Output

    Alt Output & 2 Trk Output: Balanced 1/4" (6.3 mm) TRS jacks
    Source (Alt Output/2 Trk Output): Patchable/LR post fade
    Output Impedance: <75 Ohms
    Nominal Output: +4 dBu = 0 dB meter reading
    Maximum Output Level: +22 dBu
    Residual Output Noise: -91 dBu (muted, 20 Hz to 20 kHz)

  • AES Digital Audio Outputs

    2-channel
    48 kHz sampling rate
    XLR Out
    2.5 Vpp balanced terminated 110 Ohms

  • Inputs

    Remote source for Channels 1 to 24, ST1, ST2, ST3

  • Outputs

    Remote outputs for Mix 1 to 10, LR
    Compatible with AudioRacks AR2412, AR84
    Compatible with ME personal mixing system

  • Dynamic Range

    112 dB

  • Frequency Response

    20 Hz to 20 kHz (+0/-0.5 dB)

  • Headroom

    +18 dB

  • Operating Level

    Internal Operating Level: 0 dBu

  • Alignment

    dBFS: +18 dBu = 0 dBFS (+22 dBu at XLR output)

  • Calibration

    Meter Calibration: 0 dB meter = -18 dBFS (+4 dBu at XLR output)

  • Indicators

    Meter Peak Indication: -3 dBFS (+19 dBu at XLR out), multi-point sensing
    Meter Signal Indication: -48 dBFS (-26 dBu at XLR out)
    Meter Type: Fast (peak) response

  • Sampling Rate

    48 kHz +/-100 PPM

  • Converters

    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

    32 deg. to 95 deg. F (0 deg. to 35 deg. C)

  • Power

    Mains Power: 100-240 V AC, 50/60 Hz, 120 W maximum

  • Faders

    4" (100 mm), motorized

  • Touchscreen

    5" TFT, 800 x 480 resolution

  • Softkeys

    10

  • Mute Groups

    4

  • Network

    TCP/IP Ethernet for MIDI commands and iPad app

  • Source

    Channels 1 to 24: Local, dSNAKE, or USB
    ST1, ST2, ST3: Local, dSNAKE, or USB

  • Stereo Linking

    Odd/even input pairs
    Parameters Linked: EQ, dynamics, insert, delay, assignments, sends
    Link Options: Preamp, polarity, sidechains, fader, mute, pan

  • Polarity

    Normal & reverse

  • HPF

    12 dB/octave, 20 Hz to 20 kHz

  • Insert

    Assign FX to input channels

  • Delay

    Up to 85 ms

  • Gate

    Self-key sidechain
    Threshold: -72 dBu to +18 dBu/
    Depth: 0 to 60 dB
    Attack: 50 μs to 300 ms
    Hold: 10 ms to 5 s
    Release: 10 ms to 1 s

  • Input Equalizer

    4-band fully parametric, 20 Hz to 20 kHz, +/-15 dB
    Band 1: Selectable LF shelving (Baxandall), bell
    Band 2 & 3: Bell
    Band 4: Selectable HF shelving (Baxandall), bell
    Bell Width: Non-constant Q, variable, 1.5 to 1/9 octave

  • Input Compressor

    Self-key sidechain
    Threshold: -46 to 18 dBu
    Ratio: 1:1 to infinity
    Attack: 300 μs to 300 ms
    Release: 100 ms to 1 s
    Knee: Soft or Hard
    Types: Peak manual, RMS manual, SlowOpto, PunchBag

  • Output

    Channel Direct Out to USB: Follow fader, follow mute (global options)
    Source Select (Global): Post-preamp, pre-EQ, post-EQ, post-delay

  • Mix Processing Insert

    Assign FX into Mix channels

  • Mix Processing Delay

    Up to 170 ms

  • Mix Processing Equalizer

    Graphic EQ: Constant 1/3 octave, 28 bands from 31 Hz to 16 kHz, +/-15 dB
    Parametric EQ: 4-band fully parametric, 20 Hz to 20 kHz, +/- 15 dB
    Band 1: Selectable LF shelving (Baxandall), bell
    Band 2 & 3: Bell
    Band 4: Selectable HF shelving (Baxandall), bell
    Bell Width: Non-constant Q, variable, 1.5 to 1/9 octave

  • Mix Processing Compressor

    Self-key sidechain
    Threshold: -46 to 18 dBu
    Ratio: 1:1 to infinity
    Attack: 300 μs to 300 ms
    Release: 100 ms to 1 s
    Knee: Soft or Hard
    Types: Peak manual, RMS manual, SlowOpto, PunchBag

  • Mix Processing Effects

    Internal FX: 4x RackFX engines, Send>Return or Inserted
    Types: Reverbs, delays, gated reverbs, ADT, chorus, symphonic chorus, phaser, flanger
    4x Dedicated Stereo FX Returns: Fader, mute, routing to Mix/LR, 4-band PEQ

  • PAFL

    PFL or stereo in-place AFL
    0 to -24 dB trim
    85 ms delay

  • Talkback

    Assignable to any mix
    12 dB/octave HPF

  • Signal Generator

    Assignable to any mix
    Sine, white, pink, bandpass noise

  • RTA

    31-bands, 1/3 octave 20 Hz to 20 kHz
    Follows PAFL source

  • Dimensions (W x D x H)

    Desk Mounted: 24.88 x 19.68 x 7.32" / 632 x 500 x 186mm

  • Weight

    30.86lbs / 14kg

About Allen & Heath QU-24 24 Channel Rackmountable Digital Mixer - SKU#1796212

The Allen & Heath QU-24 24 Channel Rackmountable Digital Mixer is designed with its responsive touchscreen, 25 motor faders and acclaimed AnalogiQTM recallable preamps, Qu-24 combines exceptional ease of use with class-leading audio performance. Drawing on the technologies and workflow pioneered on GLD and iLive touring systems, Qu makes Allen & Heath digital mixing more accessible and more compact than ever.

Analogiqtm Preamps
Qu-24's twenty four AnalogiQTM total recall preamps feature zero crossing detection and an advanced padless 1dB step gain stage, 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 matched to high quality 24bit digital to analogue converters to deliver the required outputs. The AnalogiQTMdesign has been refined over many months to offer superb transparency, minimal distortion and an ultra-low noise floor, with a warm, musical sound that is missing from some digital consoles.

Mixing Experience
Having massive processing power and advanced functionality is great, but it counts for nothing if you can't access the controls you need in a heartbeat. Once you start using Qu-24 you'll sense the years of research into ergonomics and the hands-on mixing experience that team has drawn upon to deliver a wonderfully natural layout and workflow. It's not about recreating an analogue interface, it's about creating an experience that's fluid, comfortable and intuitive for novices, digital natives and old school road warriors alike, making all the benefits of digital mixing technology readily accessible to all.

Touch Control
The 800 x 480, sixteen million color Touchscreen and its dedicated data encoder form the heart of the Qu interface, providing super-fast, easy access to all settings. The user-friendly interface has been designed with clarity in mind. 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.

Superstrip
All your key processing tools are presented in a clean layout on the SuperStrip, with 1 function per physical control. The SuperStrip is complemented by an onscreen Touch Channel for intuitive access to full processing parameters without clutter or complex menu structures. Processing for Mono and Stereo inputs includes trim, polarity, HPF, gate, insert, 4 band PEQ, compressor and delay. The main LR and the Mono mixes have controls for Insert, 1/3 octave GEQ, compressor and delay. The Stereo mixes provide Insert, 4-band PEQ, compressor, delay and balance control.

Fader Automation
Moving faders started as an expensive option in the studio desks of the 80s and later became the norm with the advent of digital technology. Nevertheless some entry-level digital mixers lack this precious commodity which is a fundamental part of the Total Recall approach. Fader automation is essential for rapid mixing, especially when you're dealing with multiple monitor mixes - just press a mix key and the faders immediately fly to the send levels for that mix. Qu-24 features 25 motorized ALPS faders, 24 arranged over 2 layers, allowing instant access to all channels and masters in a compact space, plus a dedicated master fader which dynamically follows the mix selection. A third, Custom layer is available for ad-hoc user strip layout, where any combination of Inputs, FX Sends, FX Returns and Mix masters can be assigned.

iLive FX
Qu-24's dynamics and FX algorithms are derived from the FX used in iLive pro touring series. Some of the world's most respected audio engineers have chosen to use iLive's FX on tour in preference to top-end plug-ins and external FX units. Qu-24 boasts 4 stereo iLive FX engines, featuring lovingly crafted emulations of legendary classic reverbs, gated reverbs, delays, modulators, flangers and more. The FX library has the ability to grow with future firmware releases. FX are returned to the mix on dedicated return channels, so you're not tying up your mono and stereo input channels.

Total Recall
True digital mixing is about being able to save and recall scenes (snapshots) at the press of a button. Qu-24 can store up to 100 full Scenes for recall at will. Channels and mixes can be made Safe from Scene recall. For example, if an instrument or mic gets swapped out after the sound check, the channel can be made safe to avoid settings being overridden by Scene recalls. Or if a broadcast feed or walk-in iPod is added last-minute before the show kicks off, that mix or channel can be made safe from any scene change. In addition, single parameter updates can be blocked using per scene Recall Filters or a Global Recall Filter. So if you tweak the graphic EQ to reflect the room response when the audience gets in, you can block this to prevent any overwriting at scene change.

USB Audio Streaming
Qu-24's built-in interface streams up to 32 selectable tracks to your Mac or PC. The returns from the Mac or PC can be easily assigned to the Input channels. The interface is class-compliant on Mac OS x - truly plug 'n play. It will be recognized straightaway 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 easily map the faders to the tracks of your favorite DAW. A DAW Control driver is available for easy setup and emulation of HUI or Mackie Control protocols on Mac OS x systems.

QU-Drive
Forget soundcard drivers and software setup, Qu-24 has an integrated multitrack USB recorder, providing 18 channels of 48kHz 24bit recording and playback straight to / from your USB hard drive. Capturing stereo or multitrack recordings of your shows has never been so easy. Multitrack audio can be played back to Mono channels 1-18. Stereo files from your hard disk can be played back to ST3.

Armed to the hilt
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. With plenty of DSP power under the hood the channel processing is only using a fraction of capacity, so Qu-24 is future-proofed, with ample room for updates and extra functionality. 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.

Shape of things to come
Made from 18 gauge, cold-rolled Zintec steel, Qu-24's distinctive frame is designed for strength and rigidity. Silence is a precious commodity in the live or studio environment, which is why nobody wants those moments of stillness ruined by the whirring of fans coming from the mix position. Qu's sleek profile generates optimal airflow through the mixer, eliminating the need for any fans.

QU-Pad
Add the Qu-Pad iPad app to your Qu setup and you're free to adjust the monitors on stage, roam around the venue whilst tweaking the PA and then mix the show from the heart of the audience. Qu-Pad connects to the mixer over Wi-Fi and gives instant access to all live mixing parameters and settings. Qu-Pad requires the connection of a Wi-Fi router or access point to the Qu-24 Network port.

Me personal mixing system
Qu-24 is fully compatible with ME Personal Mixing System. Any number of ME-1 personal mixers can be chained from the dSNAKETM port (or from an AR2412 Stagebox if you've got one connected to the dSNAKETM port). Each performer can be given tailored control over their own mix, leaving the engineer free to focus on the audience experience.

Dsnaketm
Qu-24 is a self-contained mixer, so if you've already got the analogue cables you're good to go. If you're thinking of trading in the copper multicore for a Cat5 digital snake, Qu-24's dSNAKETM port has you future-proofed, allowing connection to a remote AR2412 or AR84 Stagebox. dSNAKETM is proprietary networking solution, boasting a transport latency of only 105us over cable runs of up to 120m / 390'. So if you're mixing FoH you can place your I/O on the stage and run a single Cat5 cable back to the Qu-24 in the mix position.

Softkeys
Qu-24 packs 10 SoftKeys for more user-assignable functions such as Mute Groups, Tap Tempo, Scene navigation or PAFL Clear.

4 GROUPS
Groups 1-4 are typically used as subgroups to LR for level masters and/or processing, for example to compress a drum kit or to tame multiple lavalier microphones with a single graphic equalizer.

Matrix
Qu-24's Matrix adds 2 further stereo outputs equipped with full processing to the console's extensive I/O. It is a 'mixer within a mixer,' fed from any combination of Group 1-4, Mix 1-10 and main LR. It can be used to provide a broadcast feed, a recording mix, or duplicate the main outputs for delay stacks and fill / zone speakers where independent GEQ and delay is applied.

What's in the box:

  • Allen & Heath QU-24 24 Channel Rackmountable Digital Mixer
  • Power Cable
  • Lamp
  • Hard Case