Allen & Heath Limited
Kernick Industrial Estate
Penryn, Cornwall,
TR10 9LU, UK
www.allen-heath.com
Overview
Technical Datasheet
• 30 In / 24 Out Digital Mixer
• 5" colour touchscreen
• 24 Mono Inputs (TRS + XLR)
• 25 Motor Faders
• 3 Stereo Inputs (TRS)
• 4 Stereo FX with dedicated Sends and Returns
• 20 Mix Outputs (XLR)
• 2 Stereo Groups
• 2 Stereo Matrix Outs
• 10 SoftKeys
• Extra stereo outputs – AES digital, Alt Out, 2TRK out
• Talkback mic input
• dSNAKE Cat5 snake for remote audio using AR2412, AR84
or AB168
• 4 Mute Groups
• 4 DCA Groups
• 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
• Automatic Mic Mixing
• Output processing – PEQ, Graphic EQ, Compressor, Delay
• 31 Band Real Time Analysis and Spectrogram
• 5” (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 processing, mixes and scenes
• 100 Scene memories
• Channel Safes, Global and per Scene Recall Filters
• FX, processing and channel User Libraries
• Qu-Drive for stereo and 18-track recording/playback to USB
hard drive
• USB streaming to/from an Apple® Mac or Windows™ PC
computer
• MIDI DAW Control driver for Mac (converts to HUI or Mackie
Control)
• USB transfer of Scenes, Libraries, Shows
• User assignable Custom Layer
• Qu-Pad engineer’s mixing wireless remote app for iPad
• Qu-You personal monitoring app for iPhone, iPad, iPod
Touch
• Compatible with the Allen & Heath ME personal mixing
system
• User Permissions to restrict operator access
• Optimised fan-less airflow design for silent operation
Qu-24 v1.8 Chrome Technical Datasheet 1 Allen & Heath Ltd
Qu-24 v1.8 Chrome Technical Datasheet 2 Allen & Heath Ltd
Dimensions
A&E Specifications
The mixer shall be a desktop digital mixer with 24 mono and
3 stereo line input channels mixing to 20 mix outputs.
The surface shall include 25 moving faders with 3 layers,
each layer having dedicated keys and indicators, giving
access to input channels, output channel mixes, FX sends,
FX returns, Main mix, and a customisable layer giving
access to DCA masters and MIDI control as well as userdefined overview of channels.
Each fader strip shall have a dedicated PAFL, Mix, Select,
and Mute button with indicators, a 3-LED multi-point meter,
and coloured LED indicating fader assignment.
The mixer shall have a physical control per function following
the select button for the input and output channels allowing
for fast access to all key processing parameters.
The fader and rotary controls shall be of a high contrast
colour to the mixer surface for excellent visibility during
operation in low light conditions
Ability to assign channel on/off status to the current mix
using the channel ‘Mix’ keys shall be provided.
All processing, Pre/Post fade routing and assignments of
signals to mix send, FX send and Audio, DCA and Mute
Groups shall be accessed and adjusted via a 5-inch colour
touchscreen provided on the mixing surface.
A Channel Ducker shall be provided to reduce the level of
selected channels when a designated channel is in use. This
channel priority shall be available across all mono and stereo
input channels and also channel groups.
An Automatic Mic Mixer shall be provided for automatic level
control of up to 16 microphones using a constant gain
sharing algorithm to dynamically adjust the gain for each mic
in spoken word applications
10 user-assignable soft keys shall be provided for quick
access to Mute Groups, DCA Mutes, Tap Tempo and Scene
Recall. There shall also be dedicated keys for quick
Copy/Paste/Reset of mixes and processing parameters.
The name and number of the current selected channel or mix
shall be identified on screen when in the processing or
routing pages.
Send levels to mixes shall be displayed and adjusted using
the faders.
2 Stereo Audio Groups shall be available for sub mixing and
the combined processing of selected input channels. These
Audio Groups shall be switchable to function as additional
Send Mixes when required.
All output mix channels shall contain the following
processing: External input, Trim, Polarity, Insert, Parametric
EQ, and Graphic EQ with RTA and fader-flip mode,
Compressor, Delay.
All signal delays in the system shall be adjustable in
Milliseconds.
Qu-24 v1.8 Chrome Technical Datasheet 3 Allen & Heath Ltd
There shall be 4 stereo rack FX engines, 4 DCA groups and
4 Mute groups.
4 user-assignable effect racks shall be provided with a library
of factory preset FX emulations. The FX racks shall be
individually configurable as send/return from a channel or
FX/Mix, or inserted into input or output channels.
A global source option for the direct out of each input
channel shall be provided in the routing screen. The tap-off
point shall be adjusted to the following positions in the
processing path: post Preamp, post HPF, post Gate, post
Insert return, post PEQ, post Compressor, and post Delay.
There shall be further global options for Follow Fader, and
Follow Mute.
Direct outputs shall be assignable via the mixer soft patch
bay to any physical output socket interface channel or ME
channel.
A signal generator shall be provided with the ability to send a
variable level signal to any output mix with visual assignment
status on-screen. The following types of signals shall be
available: Sine, White Noise, Pink Noise, and Band-Pass.
Comprehensive input, output, and FX channel and Real
Time Analysis metering shall be provided on-screen.
Real Time Analysis metering shall include a spectrogram to
allow for accurate monitoring of audio energy across the
frequency spectrum over time for the purpose of feedback
detection and correction of room acoustics.
A default Mains to PAFL sub-mix shall be provided.
12-LED bar meters on the surface shall indicate the 3 Main
mix buss levels, the PAFL signal shall override the LR
meters accompanied by a PAFL-active indicator.
A Talkback facility shall be provided with the ability to send to
any output mix with on screen status indication. An option to
enable talkback latching and HPF shall be provided.
A quarter-inch jack socket for PAFL headphones output shall
be provided, with an analogue output level control.
The mixer shall include stereo and 18-track
recording/playback to optional USB hard drives. The format
shall be 48 kHz/ 16 bit WAV.
The mixer shall play back stereo WAV files at 44.1 or 48 kHz
and shall have a USB Type-A connector on the surface for
recording, playback, data-transfer, archiving, and firmware
updates to USB drive.
On the rear panel there shall be a Type-B USB connection
following the high-speed USB 2.0 standard for multi-channel,
bi-directional audio streaming of 32 out / 30 in and MIDI
DAW control between the mixer and a computer.
A DAW transport control using popular DAW control
protocols for computer shall be available via the touchscreen.
The mixer shall provide a Fast Ethernet (100 Mbit/s) port for
Cat5 cable connection to a computer for MIDI over TCP/IP
control of mixer parameters via a wireless router (access
point) for live mixing control.
The mixing system shall include application software for
Apple iOS touchscreen devices connected via a wireless
network router to the LAN port and allow control of functions
including the preamp gain, pad, and phantom power.
The application shall have a graphical representation of
physical controls and indicators present on the surface
including signal processing parameters and shall provide
control of output channel processing including Parametric
EQ, Graphic EQ, Compressor and Delay. Routing
assignments and level adjustments of input signals to all
mixes and bus shall be provided. The application software
shall provide signal metering and processing threshold
indication when online including the Real Time Analyser.
There shall be a local “dSNAKE” Ethernet audio expansion
port with locking Ethercon connector, providing up to 30 input
signals and 20 output signals, plus 40 personal mixing sends
to be connected over a single cable ‘digital snake’ and
allowing Remote Preamp control to an Allen & Heath
AudioRack, or Allen & Heath ME Personal Mixing Systems.
Input and output channel processing and parameters in the
mixer shall be saved on demand as a user library item for
recall in other channels. Individual processing sections shall
be save-able on demand as user library items for that type.
All library items shall be stored on board and archived with
the show-file. Library items shall be transferrable to USB
drive as portable data to be used in other systems.
The mixer shall provide the facility to save 100 scenes of the
settings of the mixing system and these scenes shall be
nameable.
A comprehensive table of Scene Safes shall be provided to
prevent selected items from being changed from their state
when the safe was enabled. A comprehensive scene filter
shall be provided per scene to Allow / Block each parameter
saved in a scene from being changed as that scene is
recalled.
An option shall be provided for password protection for log-in
of several users with different levels of system access and
permissions. A particular scene may be chosen to be
recalled per change of user-login if desired.
The mixing system shall periodically record all current
settings and return the mixer to that state after reboot
following a power-cycle.
The mixing control surface shall have a built in power supply
accepting AC mains voltages of 100~240V, 50/60 Hz, 95W
max via an earthed 3-pin IEC male connector mounted on
the rear chassis. A Two Pole Push-Button switch shall be
provided near the mains input.
The mixer shall have an optimised fan-less airflow design for
silent operation.
Recommended operating temperature for the mixer shall be
5 to 35 degrees Celsius.
The mixer shall be the Allen&Heath Qu-24 Digital Mixer.
Qu-24 v1.8 Chrome Technical Datasheet 4 Allen & Heath Ltd
MUTE
multi-point Pk
FADER
Input Channels 1-24(32), ST1-3
PFL
AFL
METER
Post
Pre
Direct Out
to LR
Mix
FX
PEQ
Pre
Post
FX Return 1-4
FADER
MUTE
TRIM
FX sends
TALKBACK
HPF
Press to TALK
Firmware V1.8
L R
L R
SEND
PAN
PAFL
Mic/Line 1-24(32)
ADC
SYSTEM BLOCK DIAGRAM
Qu-24(32)
Mic In
+
-
Gain
Line In
48V
ADC
Talkback Mic
+
-
LR
L R
SEND
FX 1-4
Mix>Return
METER
Mix>Return
MUTE
FADER
PFL
AFL
METER
FX Send1-4
Mix 5-6, 7-8, 9-10 Masters
L, R Masters
COMP
MUTE
METER
Global Follow Mute
Follow Fader
DELAY
DAC
-
+
DAC
BAL
-
+
+4dBu
LR Out
-
+
BAL
-
+
+4dBu
L
R
2TRK Out
DAC
-
+
DAC
BAL
-
+
+4dBu
Mix Out 5-6, 7-8, 9-10
L
R
L
R
AES digital out
AES Out
DAC
DAC
Phones
DAC
-
+
DAC
BAL
-
+
+4dBu
L
R
Alt Out
LR pre/post
L+R pre/post
DELAY
PFL TRIM
-24dB
0dB
RTA / Spectrogram
31-band 1/3 octave
PFL
AFL
PAFL
Monitor
Qu-Drive
USB B
Multitrack
Stereo
Stream
PLAYBACK
USB source
Multitrack
Stereo
Stream
RECORD
CH>Return
or
or
GEQ
Mix 1-4 Masters
COMP
28-band
DELAY
Mix Out 1-4
DAC
BAL
-
+
+4dBu
Grp
Group 1-2, 3-4, (5-6, 7-8) Masters
COMP
MUTE
FADER
BAL
L R
METER
DELAY
PFL AFL
post
DAC
-
+
DAC
BAL
-
+
+4dBu
Grp Out 1-2, 3-4, (5-6, 7-8)
L
R
to Grp
PFL
AFL
to LR
to Grp
Pre
Post
L R
SEND
to LR
L R
PAN
L R
PAN
MUTE
FADER
METER
PFL AFL
Pre
Post
L R
SEND
MTX sends
COMP
MUTE
FADER
DELAY
PFL AFL
Pre
Post
L R
SEND
BAL
L R
post
post
FADER
PFL AFL
BAL
L R
METER
Pre
Post
L R
SEND
post
L+R
L+R
MTX
Matrix 1-2, 3-4 Masters
COMP
MUTE
METER
DELAY
FADER
PFL AFL
BAL
L R
DAC
-
+
DAC
BAL
-
+
+4dBu
Mtx Out 1-2, 3-4
L
R
ASSIGN to
Mix
LEV
MUTE
Sine
White Noise
Pink Noise
Bpass Noise
SIG GEN
Grp
LR
MTX
ASSIGN to
Mix
Grp
LR
MTX
PAFL
Grp1-4(8) post
Mix1-10 post
PAFL
Gain
48V
ADC
L/M
R
+
-
+
-
ST1
ADC
ADC
L/M
R
+
-
+
-
ST2
ADC
ADC
ADC
ST3
LOCAL
dSNAKE
Global
Inputs
Outputs
USB
dSNAKE
MONITOR
To ME Personal Mix System
AR2412
48V
-
+
-20dB PAD
ADC
GAIN
Mic/Line Inputs 1-24
BAL
-
+
Ready
DAC
+4dBu
XLR Out 1-12
Inputs 25+
XLR Out 13+
CAT5
PEQ
GEQ
28-band
PEQ
GEQ
28-band
PEQ
GEQ
28-band
PEQ
GEQ
28-band
PEQ
Mix sends
FX sends
Mix sends
FX sends
Mix sends
MTX sends
MTX sends
MTX sends
to Output Patch
post
ST1-3
CH1-24(32)
Mix1-10 post
FX Ret1-4 pre
Grp1-4(8)
L+R pre/post
LR pre/post
MTX1-4 post
PAFL
Patch:
MTX1-4 post
LR pre/post
L+R pre/post
MTX1-4 post
Grp1-4(8) post
Mix1-10 post
PAFL
USB Patch 1-32:
17-18
1-18
1-32
dSNAKE
AR84
Mic/Line Inputs 1-8
XLR Out 1-4
dSNAKE
AB168
Mic/Line Inputs 1-16
XLR Out 1-8
EXPANDER
EXPANDER
Inputs 17+
XLR Out 9+
ST1-3 Dir Out
CH1-24(32) Dir Out
Mix1-10 post
FX Ret1-4 pre
Grp1-4(8) post
L+R pre/post
LR pre/post
MTX1-4 post
PAFL
MONITOR Patch 1-40:
dSNAKE XLR Out Patch:
Mix1-10 post
Grp1-4(8) post
L+R pre/post
LR pre/post
MTX1-4 post
PAFL
CH1-24(32), ST1-3, Group Source
Sends
Insert
Direct Out
(ME compatible)
(ME compatible)
AudioRack options:
Direct Out
Insert
FX
Inserted
Insert
or FX
Ducker
FX
Insert
FX
Insert
FX
Insert
FX
Insert
dSNAKE Main
dSNAKE Expander
POL
HPF
GATE
PEQ
COMP
DELAY
0
Post-PEQ
Preamp
Global source for Direct Out
TRIM
Pre-EQ
USB
Local/dSNAKE
SOURCE
To USB (Direct Outs)
Insert
Direct Out
Global source per Mix
To USB (Insert Sends)
To dSNAKE Monitor patch
ST1-3 Dir Out
CH1-32 Dir Out
Mix1-10 post
Grp1-8 post
L+R pre/post
LR pre/post
MTX1-4 post
PAFL
Ducker Trigger source:
Insert
FX
Ducker
Inserted
FX
Ducker
Ducker Trigger
or
AMM gain element
GROUP MODE
Group (routing, stereo sub-groups)
Mix (stereo sends)
Patch any socket to any channel
Patch any output to any socket
Groups can be used to provide extra stereo mixes
Post-All
Out
Inputs
AMM (Auto Mic Mixer)
Available for CH1-16
Control
Block Diagram
Qu-24 v1.8 Chrome Technical Datasheet 5 Allen & Heath Ltd
Inputs
Control
Mic/Line Inputs
Balanced, XLR and 1/4" TRS jack, fully
recallable
Faders
100mm motorised
Input Sensitivity (XLR / TRS)
-60 to +5dBu / -50 to +15dBu
Touch Screen
5" TFT, 800x480 resolution
Analogue Gain
-5 to +60dB, 1dB steps
SoftKeys
10
Maximum Input Level (XLR /
TRS)
+19dBu / +29dBu
Mute Groups
4
Input Impedance (XLR / TRS)
>5kΩ / >10 kΩ
DCA Groups
4
THD+N, Unity gain 0dB
0.0005% -89 dBu (20-20kHz, Direct Out
@0dBu 1kHz)
Network
TCP/IP Ethernet for MIDI and iPad app
THD+N, Mid gain +30dB
0.001% -83dBu (20-20kHz, Direct Out
@0dBu 1kHz)
Stereo Line Inputs
Input Processing
ST1, ST2 connector
Balanced, 1/4" TRS jack, half-normalled
Source
ST3 connector
Unbalanced, stereo 3.5mm Mini Jack
CH1-32
Local, dSNAKE, or USB
Input Sensitivity (ST1, ST2 /
ST3)
Nominal +4dBu / 0dBu
ST1, ST2
Local, dSNAKE, or USB
Trim
+/-24dB
ST3
Local, dSNAKE, or USB Stereo
Maximum Input Level
(ST1,ST2 / ST3)
+22dBu / +18dBu
USB Global Source
Qu-Drive or USB B Streaming
Input Impedance
>7kΩ
Stereo Linking
Odd/even input pairs
Outputs
Parameters linked
EQ, dynamics, insert, delay,
assignments, sends
Mix1-10 and LR Out
Balanced, XLR
Link options
Preamp, polarity, sidechains,
fader/mute, pan
Group and Matrix Out
Polarity
Normal/Reverse
Output Impedance
<75Ω
High Pass Filter
12dB/octave 20Hz – 2kHz
Nominal Output
+4dBu = 0dB meter reading
Insert
Assign FX1-4 into Input channels
Maximum Output Level
+22dBu
Delay
Up to 85ms
Residual Output Noise
-90 dBu (muted, 20-20kHz)
Gate
Self-key Sidechain
Stereo Alt Out & 2Trk Out
Balanced, 1/4" TRS jack
Threshold / Depth
-72dBu to +18dBu / 0 to 60dB
Source (Alt Output / 2Trk
Output)
Patchable / LR post-fade
Attack / Hold /
Release
50us to 300ms / 10ms to 5s / 10ms to 1s
Output Impedance
<75Ω
Nominal Output
+4dBu = 0dB meter reading
PEQ
4-Band fully parametric, 20-20kHz, +/15dB
Maximum Output Level
+22dBu
Band 1
Selectable LF Shelving (Baxandall), Bell
Residual Output Noise
-90 dBu (muted, 20-20kHz)
Band 2, Band 3
Bell
Band 4
Selectable HF Shelving (Baxandall), Bell
AES Digital Output
2 channel, 48kHz sampling rate, XLR
Bell Width
Non-constant Q, variable, 1.5 to 1/9th
octave
2.5Vpp balanced terminated 110Ω
dSNAKE
Compressor
Self-key Sidechain
Inputs
Remote source for CH1-32, ST1, ST2,
ST3
Threshold / Ratio
-46dBu to 18dBu / 1:1 to infinity
Outputs
Patchable from Mix1-10, LR, Grp1-8,
MTX1-4
Attack / Release
300us – 300ms / 100ms - 2s
Compatible with AudioRacks AR2412,
AR84, AB168
Knee
Soft/Hard
Compatible with ME personal mixing
system
Types
Peak Manual, RMS Manual, SlowOpto,
PunchBag
System
Measured balanced XLR in to XLR out,
0dB gain, 0dBu input
Dynamic Range
112 dB
Mix Processing
Frequency Response
+0/-0.5dB 20Hz to 20kHz
Channel Direct Out
to USB
Follow Fader, follow Mute (global
options)
Headroom
+18dB
Source select (global)
Post-Preamp, Pre-EQ, Post-EQ, PostDelay
Internal operating Level
0dBu
dBFS Alignment
+18dBu = 0dBFS (+22dBu at XLR
output)
Insert
Assign FX into Mix channels
Meter Calibration
0dB meter = -18dBFS (+4dBu at XLR
out)
Delay
Up to 170ms
Meter Peak indication
-3dBFS (+19dBu at XLR out), multi-point
sensing
Mixer Specifications
Qu-24 v1.8 Chrome Technical Datasheet 6 Allen & Heath Ltd
Meter Signal indication
-48dBFS (-26dBu at XLR out)
GEQ
Constant 1/3 oct, 28 bands 31Hz-16kHz,
+/-12dB Gain
Meter Type
Fast (peak) response
PEQ
4-Band fully parametric, 20-20kHz, +/15dB
Sampling Rate
48kHz +/-100PPM
Band 1
Selectable LF Shelving (Baxandall), Bell
ADC, DAC
24-bit Delta-Sigma
Band 2, Band 3
Bell
Latency
1.2 ms (local XLR in to XLR out)
Band 4
Selectable HF Shelving (Baxandall), Bell
0.7 ms (local XLR in to AES out)
Bell Width
Non-constant Q, variable, 1.5 to 1/9th
octave
Operating Temperature Range
0 deg C to 35 deg C
Compressor
Self-key Sidechain
(32 deg F to 95 deg F)
Threshold / Ratio
-46dBu to 18dBu / 1:1 to infinity
Mains Power
100-240V AC, 50/60Hz
Attack / Release
300us – 300ms / 100ms - 2s
Maximum Power Consumption
120W
Knee
Soft/Hard
Types
Peak Manual, RMS Manual, SlowOpto,
PunchBag
USB Audio
Qu-Drive
USB A
FX
Stereo Record
2 channel, WAV, 48kHz, 24-bit,
patchable
Internal FX
4x RackFX engine, Send>Return or
Inserted
Stereo Playback
2 channel, WAV, 44.1 or 48kHz, 16 or
24-bit, to ST3
Audio Tools
Multitrack Record
18 channel, WAV, 48kHz, 24-bit,
patchable
Types
Reverbs, Delays, Gated Reverb, ADT
Multitrack Playback
18 channel, WAV, 48kHz, 24-bit
Chorus, Symphonic Chorus, Phaser,
Flanger
4 dedicated Stereo FX
returns
Fader, Pan, Mute, Routing to Mix/LR, 4Band PEQ
USB Audio Streaming
USB B, Core Audio compliant
Send (upstream)
32 channel, WAV, 48kHz, 24-bit
PAFL
PFL or stereo in-place AFL, 0 to -24dB
Trim, 85ms Delay
Return (downstream)
30 channel, WAV, 48kHz, 24-bit
Talkback
Assignable to any mix, 12dB/oct HPF
Signal Generator
Assignable to any mix, Sine /
White/Pink/Band-pass Noise
Dimensions & Weights
RTA
31-Bands 1/3 octave 20-20kHz, follows
PAFL source
Qu-24 Mixer
Width x Depth x Height
Desk mounted
632 x 500 x 186 mm (24.9" x 19.7" x
7.4")
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)
Qu-24 v1.8 Chrome Technical Datasheet 7 Allen & Heath Ltd
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