Allen & Heath GL2400 User Manual
ALLEN&HEATH
GL2400
USER GUIDE
Publication AP5597
Limited One Year Warranty
This product is warranted to be free from defects in materials or workmanship for
a period of one year from the date of purchase by the original owner.
To ensure a high level of performance and reliability for which this equipment has
been designed and manufactured, read this User Guide before operating. In the
event of a failure, notify and return the defective unit to Allen & Heath Limited or
its authorised agent as soon as possible for repair under warranty subject to the
following conditions
Conditions Of Warranty
1. The equipment has been installed and operated in accordance with the
instructions in this User Guide
2. The equipment has not been subject to misuse either intended or accidental,
neglect, or alteration other than as described in the User Guide or Service
Manual, or approved by Allen & Heath.
3. Any necessary adjustment, alteration or repair has been carried out by Allen
& Heath or its authorised agent.
4. This warranty does not cover fader wear and tear.
5. The defective unit is to be returned carriage prepaid to Allen & Heath or its
authorised agent with proof of purchase.
6. Units returned should be packed to avoid transit damage.
In certain territories the terms may vary. Check with your Allen & Heath agent for
any additional warranty which may apply.
This product complies with the European Electromagnetic
Compatibility directives 89/336/EEC & 92/31/EEC and the
European Low Voltage Directives 73/23/EEC & 93/68/EEC.
This product has been tested to EN55103 Parts 1 & 2 1996 for use in
Environments E1, E2, E3, and E4 to demonstrate compliance with the
protection requirements in the European EMC directive 89/336/EEC.
During some tests the specified performance figures of the product
were affected. This is considered permissible and the product has
been passed as acceptable for its intended use. Allen & Heath has a
strict policy of ensuring all products are tested to the latest safety and
EMC standards. Customers requiring more information about EMC
and safety issues can contact Allen & Heath.
NOTE: Any changes or modifications to the console not approved by
Allen & Heath could void the compliance of the console and therefore
the user’s authority to operate it.
GL2400 User Guide AP5597 Issue 2
Copyright © 2005 Allen & Heath Limited. All rights reserved
Allen & Heath Limited
Kernick Industrial Estate, Penryn, Cornwall, TR10 9LU, UK
http://www.allen-heath.com
2 GL2400 User Guide
Important Safety Instructions
WARNINGS
- Read the following before proceeding :
CAUTION
ATTENTION: RISQUE DE CHOC ELECTRIQUE – NE PAS OUVRIR
Read instructions: Read and retain these safety and operating
instructions for future reference. Adhere to all warnings printed here and
on the console. Follow the operating instructions printed in this User
Guide.
Do not remove cover: Operate the console with its underside
cover correctly fitted. Disconnect mains power by unplugging the power
cord if the cover needs to be removed for setting internal options. Refer
this work to competent technical personnel only.
Power sources: Connect the console to a mains power outlet only
of the type described in this User Guide and marked on the rear panel.
Use the power cord with sealed mains plug appropriate for your local
mains supply as provided with the console. If the provided plug does not
fit into your outlet consult your service agent for assistance.
Power cord routing: Route the power cord so that it is not likely
to be walked on, stretched or pinched by items placed upon or against it.
Grounding: Do not defeat the grounding and polarisation
means of the power cord plug. Do not remove or tamper with the ground
connection in the power cord.
WARNING: This equipment must be earthed.
Water and moisture: To reduce the risk of fire or electric shock
do not expose the console to rain or moisture or use it in damp or wet
conditions. Do not place containers of liquids on it which might spill into
any openings.
Ventilation: Do not obstruct the rear and top ventilation slots or
position the console where the air flow required for ventilation is impeded.
If the console is to be operated in a flight case, plinth or other furniture
ensure that it is constructed to allow adequate ventilation.
Heat and vibration: Do not locate the console in a place
subject to excessive heat or direct sunlight as this could be a fire hazard.
Locate the console away from any equipment which produces heat or
causes excessive vibration.
Servicing: Switch off the equipment and unplug the power
cord immediately if it is exposed to moisture, spilled liquid, objects fallen
into the openings, the power cord or plug become damaged, during
lightning storms, or if smoke, odour or noise is noticed. Refer servicing to
qualified technical personnel only.
Installation: Install the console in accordance with the
instructions printed in this User Guide. Do not connect the output of
power amplifiers directly to the console. Use audio connectors and plugs
only for their intended purpose.
GL2400 User Guide 3
General Precautions
Damage To prevent damage to the controls and cosmetics avoid
placing heavy objects on the control surface, scratching the surface with
sharp objects, or rough handling and vibration.
Environment Protect from excessive dirt, dust, heat and vibration
when operating and storing. Avoid tobacco ash, smoke, drinks spillage,
and exposure to rain and moisture. If the console becomes wet, switch
off and remove mains power immediately. Allow to dry out thoroughly
before using again.
Cleaning Avoid the use of chemicals, abrasives or solvents. The
control panel is best cleaned with a soft brush and dry lint-free cloth. The
faders, switches and potentiometers are lubricated for life. The use of
electrical lubricants on these parts is not recommended. The fader and
potentiometer knobs may be removed for cleaning with a warm soapy
solution. Rinse and allow to dry fully before refitting them.
Lifting To avoid injury to yourself or damage to the equipment take
care when lifting, moving or carrying the console.
Transporting The console may be transported as a free-standing
unit or mounted in a purpose built flight case. We recommend that the
console is surrounded by shock absorbent foam to protect it from
damage during transit. Always use adequate packing if you need to ship
the unit. Protect the controls to avoid damage when moving the console.
Hearing To avoid damage to your hearing do not operate any sound
system at excessively high volume. This also applies to any close-to-ear
monitoring such as headphones and IEM transducers. Continued
exposure to high volume sound can cause frequency selective or wide
range hearing loss.
Important Mains plug wiring instructions.
The console is supplied with a moulded mains plug fitted to the AC
mains power lead. Follow the instructions below if the mains plug has
to be replaced. The wires in the mains lead are coloured in
accordance with the following code:
TERMINAL
European USA/Canada
L LIVE BROWN BLACK
N NEUTRAL BLUE WHITE
E EARTH GND GREEN & YELLOW GREEN
The wire which is coloured Green and Yellow must be connected to
the terminal in the plug which is marked with the letter E or with the
Earth symbol. This appliance must be earthed.
The wire which is coloured Blue must be connected to the terminal in
the plug which is marked with the letter N.
The wire which is coloured Brown must be connected to the terminal
in the plug which is marked with the letter L.
Ensure that these colour codes are followed carefully in the event of
the plug being changed.
WIRE COLOUR
4 GL2400 User Guide
Introduction
Welcome to the Allen & Heath GL2400, the latest generation of the popular GL series of
dual function live sound mixing consoles. We have tried to keep this user guide brief and to
the point. Please read it fully before starting. Included is information on installing,
connecting and operating the console, panel drawings, system block diagram and
technical specification. For further information on the basic principles of audio system
engineering, please refer to one of the specialist publications and resources available from
bookshops, audio equipment dealers and the Internet.
Whilst we believe the information in this guide to be reliable we do not assume
responsibility for inaccuracies. We also reserve the right to make changes in the interest of
further product development.
We are able to offer further product support through our world-wide network of approved
dealers and service agents. You can also access our Web site on the Internet for
information on our full product range, resource downloads, our company pedigree, contact
details, assistance with your technical queries, or simply to chat about audio. To help us
provide the most efficient service please keep a record of your console serial number, and
date and place of purchase to be quoted in any communication regarding this product.
http://www.allen-heath.com
Gain Structure.................................................. 23
Using the Oscillator / Noise Generator ........... 24
Mixing with Faders or Gain Controls............... 24
Using PFL / AFL ............................................... 25
The dB.............................................................. 25
Using Inserts ....................................................25
Polarity ............................................................. 26
Mixing the PA in Mono or Stereo? .................. 26
Zero the console .............................................. 26
Turning the System On or Off ......................... 26
Sound Levels ...................................................26
Dual Functionality ............................................27
Applications for the Matrix............................... 28
Create IEM Mixes with Ambience ................... 29
Using the Matrix to Create a Recording.......... 29
Recording with the GL2400............................. 29
Pre/Post Fade Aux Settings ............................ 29
Aux-Fed Subs .................................................. 30
Creating a Separate C Mix .............................. 30
Other M Output Applications........................... 30
Using the Channel Direct Outputs .................. 31
Using the Stereo Channels ............................. 31
A Note about Combining Signals ................... 31
Contents
Warranty................................................. 2
Important Safety Instructions ................3
General Precautions ..............................4
Introduction to this Guide...................... 5
Panel Layouts ........................................ 6
Introducing the GL2400....................8
Installing the Console ..........................10
Connecting Power ...............................11
Audio Connections ..............................13
The Console Connectors ....................14
Mono Input Channel ............................16
Stereo Input Channel........................... 18
Group/Aux Masters.............................. 19
Aux5-6, LRM Masters........................... 20
7x4 Matrix............................................. 21
Monitor, Talkback and Sig Gen ..........22
Applications and Operating Tips.........23
Specifications ......................................32
System Block Diagram ........................34
User Options........................................35
Cue Sheet ............................................38
GL2400 User Guide 5
+48V
POLARITY
LINE LINE
(PAD) (PAD)
0
30
40
20
GAIN
50
6-14 4060 6-14 4060
HPF
100Hz
HF
12k
-15
+15
3k
1k
4k
700
6k
500Hz
15k
HM
+15
-15
180
70
250
45
400
35Hz
1k
LM
-15
+15
LF
80Hz
-15
+15
EQ IN
AUX
1
OO +6
AUX
2
OO +6
AUX
3
OO +6
AUX
4
OO +6
POST
PRE
AUX
5
OO +6
AUX
6
+6OO
POST
PRE
=
PAN
L
R
ODD
EVEN
MUTE
+48V
POLARITY
0
30
40
20
GAIN
50
HPF
100Hz
HF
12k
-15
+15
3k
1k
4k
700
6k
500Hz
15k
HM
+15
-15
180
70
250
45
400
35Hz
1k
LM
-15
+15
LF
80Hz
-15
+15
EQ IN
AUX
1
OO +6
AUX
2
OO +6
AUX
3
OO +6
AUX
4
OO +6
POST
PRE
AUX
5
OO +6
AUX
6
+6OO
POST
PRE
=
PAN
L
R
ODD
EVEN
MUTE
+48V
30
40
20
MIC
GAIN
6
60
0
-5
ST1
-10
-20
O
O
16
STEREO
CH15
LR
0
-5
ST2
-10
-20
O
O
16
STEREO
CH15 CH16
LR
HF
12k
-15
+15
HM
2k5
-15
+15
LM
250Hz
-15
+15
LF
80Hz
-15
+15
EQ IN
AUX
1
OO +6
AUX
2
OO +6
AUX
3
OO +6
AUX
4
OO +6
POST
PRE
AUX
5
OO +6
AUX
6
+6OO
POST
PRE
=
BAL
L
ODD
EVEN
MUTE
+48V
30
40
20
MIC
GAIN
50
5
10
5
10
R
ST3
STEREO
ST4
STEREO
250Hz
80Hz
HF
12k
HM
2k5
LM
LF
AUX
1
AUX
2
AUX
3
AUX
4
AUX
5
AUX
6
BAL
-10
-20
-10
-20
6
-5
O
O
-5
O
O
-15
-15
-15
-15
OO +6
OO +6
OO +6
OO +6
OO +6
L
ODD
50
60
0
16
CH16
LR
0
16
LR
+15
+15
+15
+15
EQ IN
POST
PRE
+6OO
POST
PRE
=
EVEN
MUTE
EXT
EXT
EXT
IN IN
5
10
5
10
GRP
GRP
GRP
GRP
LEVEL
OO
O+6
O +6
GRP
1
1
OO
O
+6
O +6
GRP
2
2
OO
O
+6
O +6
GRP
3
3
OO
O
+6
O +6
GRP
4
4
OO
O
+6
L
OO
R
OO
O +6
L
O+6
O +6
R
OO
O
+6
O +6
LEVEL
O
+6
O +6
MUTE
MUTE
AFL AFL
AUX
2
PAN
PK!
+6
0
SIG
OO+10 +10
AFL
REV
GRP2GRP1
TO LR
=
AUX
+6
SIG
AUX
0 0
1
OO
AFL
REV
TO LR
PAN
L R=L R
PK!
+6
0
SIG
R
MUTE MUTE
AFLAFL
IN
O
O +6
GRP
1
O
O +6
GRP
2
O
O +6
GRP
3
O
O +6
GRP
4
O
O +6
L
O
O +6
R
O
O +6
LEVEL
OO +6
3
OO +10 OO
REV
PAN
PK!
0
MUTE
AFL
0
AFL
EXT
IN
O
O +6
GRP
1
O
O +6
GRP
2
O
O +6
GRP
3
O
O +6
GRP
4
O
O +6
L
O
O +6
R
O
O +6
LEVEL
OO +6
AUX
4
REV REV
GRP4GRP3
TO LRTO LR
=
PAN
PK!
+6
0
SIG
TALKBACK
MIN MAX
OSC/NOISE
MINLMAX
1kHz
PINK
ON
SELECT
L-R
GRP
1-4
AUX
1-2
AUX
3-4
AUX
5-6
MUTE
TALK
AFL
AUX
0
5
+10
OO +10 OO
AFL
RL R=L
PK!
+6
0
SIG
MUTEMUTE MUTE
MIC
PHONES
2TRK REPLAY
OO
+10
2TRK
TO LR
R
+16
+9
+6
+3
0
-3
-6
-9
-12
-16
-20
-30
PFL
POWER
AFL
MONITOR
0
10
L-R
2TRK
AUX
0
0
6
+10
AFL
AFL
REV
MODE
FOH
MONITOR
LISTEN WEDGE
M SOURCE
MONO (L+R)
AUX 6
(AUX FED SUB)
PK!
PK!
+6
+6
0
SIG
AFLAFLAFL
0
SIG
MUTE
AFL
AFL
6 GL2400 User Guide
G
The Range:
GL2400-16 14 mono mic/line, 2 mic/dual stereo
GL2400-24 22 mono mic/line, 2 mic/dual stereo
GL2400-32 30 mono mic/line, 2 mic/dual stereo
GL2400-40 38 mono mic/line, 2 mic/dual stereo
RPS11 External power supply for the GL2400-40
MPS12 Backup power supply for the 16,24,32 frame sizes
GL2400-SLV2 Sys-Link V2 console in/out expander option kit
LAMP
2TRK IN
2TRK OUT
LISTEN WEDGE AUX 6 AUX 5 AUX 4 AUX 3 AUX 2 AUX 1
OUT
M OUT R OUT L GRP 4 GRP 3 GRP 2 GRP 1
MONITOR
OUT
MATRIX
EXT
EXT
IN IN IN IN
MTX
4
INSERTLINSERT4INSERT3INSERT2INSERT1INSERT
L/MR
R
AUX5AUX4AUX3AUX2AUX1AUX
6
LR
R L GRP 4GRP 3GRP 2GRP 1
EXT
3421
MTX
MTX
3
2
MATRIX EXT IN
LR
IN1
IN2
IN3
IN4
EXT
MTX
1
LAMP
ENGINEERED IN ENGLAND BY ALLEN & HEATH LIMITED
MIC OUT
ST4 ST3 ST2 ST1
L/M
R
GRP/AUX REVERSE
L/M
R
(BREAKPOINT)
MIC OUT
1516
L/MRL/M
R
MIC INMIC IN
1516
USE ONLY THE RECOMMENDED A&H BACKUP POWER SUPPLY
DIRECT
OUT
7
INSERT
7654321
EXT DC IN
DIRECT
OUT
INSERT
6
DIRECT
OUT
INSERT
LINE IN
14
MIC IN
EXT INT
DIRECT
14
14 13 12 11 10 9 8
OUT
13
INSERT
LINE IN
LINE INLINE IN
13
MIC IN
AVIS: RISQUE DE CHOC ELECTRIQUE - NE PAS OUVRIR.
WARNING: TO REDUCE THE RISK OF ELECTRIC S HOCK
DO NOT EXPOSE THIS APPARATUS TO RAIN OR MOISTURE.
THIS APPARATUS MUST BE EARTHED BY THE POWER CORD.
ACTIVE POWER SUPPLY
DIRECT
OUT
5
INSERT
DIRECT
OUT
12
INSERT
LINE IN
12
MIC IN MIC IN MIC IN MIC IN MIC IN
CAUTION
RISK OF ELECTRIC SHOCK
DO NOT OPEN
SERIAL NUMBER
DIRECT
OUT
4
INSERT
DIRECT
OUT
11
INSERT
LINE IN
11
CAUTION: FOR CONTINUED PROTECTION AGAINST RISK OF FIRE REPLACE FUSE WITH SAME TYPE AND RATIN
ATTENTION: REMPLACER LE FUSIBLE AVEC UN DES MEMES CARACTERISTIQUES.
DIRECT
OUT
3
INSERT
ON/OFF
I
0
DIRECT
OUT
INSERT
DIRECT
OUT
10
INSERT
LINE IN
10
100 - 240 V AC ~ 47- 63 Hz 90W MAX
2
MAINS INPUT
DIRECT
INSERT
OUT
DIRECT
OUT
INSERT
LINE IN
9
1
DIRECT
9
OUT
INSERT
LINE IN
LINE INLINE INLINE INLINE INLINE IN
8
8
FUSE
T1.6A L 250V 20MM
LINE IN
7
MIC IN MIC IN MIC IN MIC IN MIC IN MIC IN MIC IN
LINE IN
6
LINE IN
5
OUTPUT INPUT
LINE IN
4
SYS-LINK V2 CONSOLE EXPANDER ( option )
LINE IN
3
LINE IN
2
LINE IN
LINE INLINE INLINE INLINE INLINE INLINE INLINE IN
GL2400 User Guide 7
1
Introducing the Allen & Heath GL2400
The GL2400 is a 4-bus dual function analogue mixing console designed for professional
audio applications. Whether mixing FOH, monitors or both, recording live or in the studio,
installed in a busy venue, out on the road touring, or earning its keep in rental stock, the
GL2400 provides the perfect solution. Engineered to the same exacting standards as
our top of the range consoles it ensures the highest reliability and finest sonic performance.
We have taken the outstanding success of our industry leading GL2200 and provided yet
more innovative capability and enhanced performance for modern mixing.
• 16, 24, 32, 40 channel frames
• LR main mix
• Multi- mode M output
• 4 Group sends
• 6 Aux sends
• 7x4 Matrix
• Proper dual functionality for FOH/Monitor mixing
• Recording capable
• M can be configured as LR sum, C mix, Wedge, or Aux-Fed Sub master
• Sub grouping with pan control
• Matrix external inputs with level trims and common input capability
• 2 stereo channels each with mic and dual stereo line inputs
• Stereo channel mic input can cross patch into matrix for ambience feed
• Stereo channel line inputs can be assigned independently to LR
• Responsive 4 band, 2 sweep EQ
• 100Hz channel high pass filters
• Individual phantom power
• Polarity switching
• Channel and master meters
• Channel direct outputs
• Per channel pre/post fader aux switching
• Internal jumper plugs for pre/post-EQ aux, direct out and other options
• Mutes on all fader masters
• 100mm dust protected faders
• Assignable talkback
• 1kHz oscillator / pink noise generator
• 2-Track monitoring and replay to LR
• Headphones and local monitor outputs
• Dedicated stereo monitor meters
• Electronically balanced XLR outputs with +26dBu drive capability
• Preamp +34dBu maximum input capability for mic or line
• Ultra low noise mix head amp design
• Internal power supply with redundant backup supply input
• Metal jacks, gold-plated XLRs, sealed pots and switches
• Individual circuit card assembly with nutted pots
• Solid copper bus grounding
• Sys-Link V2 console linking option
• 4-pin lamp sockets
8 GL2400 User Guide
Here are just a few key points we considered when specifying the GL2400:
Affordability We understand your need to work within a realistic budget and know you
want to get the very best return for your investment. We know too that even the lowest
budget shows put the same tough demands on the operator who wants the reassurance of
continued reliability and intuitive control, the satisfaction of achieving that special sound,
and the functionality to deal with the trickiest situations. We have avoided the temptation of
designing in costly plastic trims and needless external add-ons for styling only. Instead we
have invested every penny of our budget into parts that make a real difference in improving
performance, durability and flexibility of use, whether the comfortable soft feel armrest, the
practically shaped space saving steel chassis, the wide viewing angle meter design, the
exceptional feature set, or the ‘under the bonnet’ engineering such as the solid copper
grounding strip, individual cards, circuit enhancements and more. The result is a nononsense, durable mixing tool right for its application… a sensible investment.
Reliability Without doubt, the most important quality for any equipment intended for the
professional application. The GL2400 uses the well proven and long term serviceable
Allen & Heath method of individual channel card construction with every potentiometer
nutted to the front panel, a solid steel chassis with rigid beam front extrusion, 100mm
smooth travel faders with protective dust covers, metal bodied jacks and gold-plated
Neutrik XLRs, and sealed Alps pots and switches to ensure you can mix with confidence
show after show. The console power supply has a wide input range, plenty of overhead
and even includes a backup supply capability for added security.
Performance The GL2400 benefits from our latest circuit developments which have
improved the sound and responsiveness of the mic preamp and EQ, and achieved
astonishingly low residual noise from the mix head amp and output stages, crucial when
mixing into modern high powered speaker systems. The new mic preamp maintains ultra
low distortion and can accept as much as+34dBu to deal with the hottest signal you are
ever likely to plug in. The XLR outputs provide proper differential drive up to a massive
+26dBu to work with the longest and most hostile cable environments. Extensive listening
evaluation together with solid engineering practice have ensured the console achieves
accurate sound reproduction under all conditions.
Capability We know a thing or two about ‘Dual Functionality’ having pioneered this
innovative feature back in the early 90’s. The GL2400 takes this an important stage
further. Tamperproof recessed switches configure the console safely for optimum FOH or
stage monitor operation, or for mixing monitors from FOH. In FOH mode you even get a
fader controlled XLR ‘M’ output which can be configured to drive a mono PA or fill, or to
work with an aux to create a ‘C’ mix within an LCR system, or as a convenient master
control when using the increasingly popular ‘aux-fed-subs’ technique. In MONITOR mode
the ‘M’ fader becomes the engineer’s monitor wedge control, you get all six aux masters
available on faders with mutes, inserts, meters and electronically balanced XLR drive, and
you still get the 4 subgroups to LR, and the groups/LR feeding the matrix. Unique at this
price point we have added a 7x4 matrix to give you even greater mixing capability. For
example, in FOH mode you can create independent fill speaker and acoustics
compensated recording feeds, even capturing the atmosphere by cross patching the stereo
channel mic preamps into the matrix to add individual or common mono or stereo
ambience signals. In MONITOR mode the matrix gives you yet more monitor outputs easily
created from the groups and LR with added ambience for the in-ear application. This
compact console can feed up to 10 independent mixes, for example 6 wedges and 4 mono
or 2 stereo IEM. We have also considered the RECORDING application with direct outputs
on all mono channels, 4 groups, matrix and not least the studio quality analogue mic
preamps and EQ. Whatever your application you get full control with nothing wasted.
Attention to detail In true Allen & Heath form, every detail has been meticulously
thought through. Take for example, the compact, no frills chassis that gives you a seat
saving, flight case convenient footprint, the provision of individual channel rather than
restrictive global pre/post aux switching, comprehensive talkback, the built-in tone/pink
noise generator for system checking, full channel and main output metering, the multifunctional stereo strips with patchable mic pre’s and dual assignable stereo inputs, the host
of internal pluggable jumper options, Sys-Link V2 console expansion… and much more.
We hope you enjoy being as creative using the GL2400 as our team enjoyed creating it.
Carey Davies, Head of Design, and sound guy too…
GL2400 User Guide 9
Installing the Console
The GL2400 has a space saving, compact chassis design. This is convenient both in
saving seats for the paying audience in a busy venue, and in reducing the size, complexity
and weight of flight casing for on-the-road use. The control surface has a 10 degree slope
for optimum visibility during operation. The rear connector panel has a split angle design
for ease of plugging and unplugging the connectors.
Free Standing The console has rubber feet fitted for free standing operation on a flat
surface. Make sure the surface is well supported, stable and big enough for the console to
sit securely on all its feet. Allow enough space behind the console for access to its
connectors.
Flight Casing The console is shaped for easy flight casing. Make sure it is supported
on all sides using suitably thick, shock absorbent foam intended for this purpose. Ensure
no part of the case or its lid touches the controls or connectors. If you include a rear
‘doghouse’ to house the connections make sure the cables can be supported in a way that
prevents putting stress on the console connectors. To prevent transit damage through
inadequate protection, we recommend you have the flight case supplied or approved by a
professional, specialist equipment case manufacturer.
Do not obstruct the ventilation openings on the top and rear surfaces. Ensure
adequate air flow around these surfaces. To avoid audible hum, buzz or other
performance degradation, do not place equipment that radiates strong
electromagnetic fields such as mains power supplies, amplifiers and computers next
to or directly underneath the console.
5
149
6
GL2400-416 = 609
GL2400-424 = 817
GL2400-432 = 1025
GL2400-440 = 1233
GL2400-416 = 14 MONO / 2 STEREO INPUTS
GL2400-424 = 14 MONO / 2 STEREO INPUTS
GL2400-432 = 14 MONO / 2 STEREO INPUTS
GL2400-440 = 22 MONO / 2 STEREO INPUTS
5
4
553
MASTER
SECTION
7
7
7
57
63
21
GL2400-424 = 8 MONO INPUTS
GL2400-432 = 16 MONO INPUTS
GL2400-440 = 16 MONO INPUTS
560
10 GL2400 User Guide
Connecting Power
MAINS INPUT
100 - 240 V AC ~ 47- 63 Hz 90W MAX
FUSE
T1.6A L 250V 20MM
EXT DC IN
EXT INT
USE ONLY THE RECOMMENDED A&H BACKUP POWER SUPPLY
ACTIVE POWER SUPP LY
RISK OF ELECTRIC SHOCK
AVIS: RISQUE DE CHOC ELECTRIQUE - NE PAS OUVRIR.
WARNING: TO REDUCE THE RISK OF ELECTRIC SHOCK
DO NOT EXPOSE THIS APPARATUS TO RAIN OR MOISTURE.
THIS APPARATUS MUST BE EARTHED BY THE POWER CORD.
CAUTION
DO NOT OPEN
SERIAL NUMBER
ON/OFF
I
0
CAUTION: FOR CONTINUED PROTECTION AGAINST RISK OF FIRE REPLACE FUSE WITH SAME TYPE AND RATING.
ATTENTION: REMPLACER LE FUSIBLE AVEC UN DES MEMES CARACTERISTIQUES.
Read and understand the Important Safety Instructions printed at the start of this guide,
and the warnings printed on the rear of the console. Check that the console power supply
mains voltage input is the same as your local supply. Check that the correct mains lead
with moulded plug has been provided with your console. Make sure that the IEC mains
plug is pressed fully into the panel socket before switching on.
Grounding
The connection to ground in an audio system is important for two reasons:
1. SAFETY - To protect the operator from high voltage electric shock, and
2. AUDIO PERFORMANCE - To minimise the effect of ground (earth) loops which result in
audible hum and buzz, and to shield the audio signals from interference.
For safety it is important that all equipment grounds are connected to mains ground so that
exposed metal parts are prevented from carrying high voltage which can injure or even kill
the operator. Do not disconnect the ground connection in the mains lead. It is
recommended that the system engineer check the continuity of the safety ground from all
points in the system including microphone bodies, turntable chassis, equipment cases,
rack metalwork and so on.
Switching the console on and off
It is good practice to turn power amplifiers off before switching the console and any other
connected equipment on or off. This prevents any unexpected clicks or thumps when the
equipment is powered up.
Turn amplifiers and powered speakers on last and off first.
To turn the console on, press the ON/OFF switch next to the IEC mains input socket. To
turn the console off, press this switch again.
Connecting a backup supply
A socket is included for plugging in an optional backup power supply. This provides the
reassurance of power supply dual redundancy, a feature usually found only on expensive
top end consoles. The console uses diode combining technology so that both supplies
can be powered at the same time. One will automatically take over should the other stop
working. The recommended backup supply for the GL2400 16, 24 and 32 models is the
Allen & Heath MPS12 power unit. The recommended backup supply for the 40 channel
model is the Allen & Heath RPS11 power unit.
Only plug the recommended Allen & Heath power unit into this socket. Do not
attempt to modify any other power unit to work with the console. Do not attempt to modify
or extend the DC power cable that comes with the supply.
The console can work with just the internal supply powered by mains, or just the backup
supply, or with both powered at the same time. To ensure uninterrupted performance in
the unlikely event of a failure, we recommended that both supplies are powered.
GL2400 User Guide 11
XLR male socket XLR female socket
INPUTOUTPUT
1+3 = 12V
3
Female XLR plug
PIN 2 = HOT
BALANCED
UNBALANCED
INPUT / OUTPUT
UNBALANCED
link Ring to Sleeve
BALANCED
1=ground
Sleeve=ground
Ring=cold -
3=cold -
Tip=hot +
2=hot +
21
12
1
4 = 0V
LAMP
3
3
2=hot +
3=cold -
1=ground
BALANCED
XLR male plug
UNBALANCED
HEADPHONES
Sleeve=ground
Ring=RIGHT
Tip=LEFT
SYS-LINK V2 OPTION
SYS-LINK II OUTPUT OPTION
14 GRP 3+
15 GRP 2+
16 GRP 1+
17 R+
18 L+
19 0V (CHS)
13 GRP 4+
12 AUX 1+
11 AUX 2+
10 AUX 3+
9 AUX 4+
8 AUX 5+
7 AUX 6+
6 PFL+
5 AFL+
4 nc
3 PFL DC
2 AFL DC
1 0V (PAFL)
UNBALANCED
INSERT
Sleeve=ground
Ring=return
Tip=send
L- 37
R- 36
AUX 1- 31
AUX 4- 28
AUX 5- 27
AUX 2- 30
GRP 3- 33
GRP 2- 34
GRP 1- 35
GRP 4- 32
AUX 3- 29
AUX 6- 26
PFL- 25
nc 21
nc 23
nc 20
nc 22
AFL- 24
12 GL2400 User Guide
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