Allen&Heath GR05 User Manual
ALLEN&HEATH
GR05
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Audio Zone Mixer
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Introduction ......................... 3
Welcome to the GR05 ......... 4
The System.......................... 5
Overview of Installation ....... 6
Positioning the Unit ............. 8
Connecting Power............... 9
Front Panel ..........................10
Rear Panel ...........................11
Mic/Line Inputs ....................12
Line Inputs ........................... 14
Outputs ................................ 15
Level Control........................ 16
Remote Control ...................17
Ducking................................ 18
Expander In/Out ..................20
Specification ........................ 21
Block Diagram ..................... 22
Configuration Sheet............. 23
USER GUIDE
INSTALLATION
Publication AP3181
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. The defective unit is to be returned carriage prepaid to Allen & Heath or its authorised
agent with proof of purchase.
5. 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.
NOTE: Any changes or modifications to the unit not approved by Allen & Heath could void the
compliance of the unit and therefore the user’s authority to operate it.
GR05 User Guide AP3181 Issue 5
Copyright © 2008 Allen & Heath Limited. All rights reserved
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.
Allen & Heath Limited
Kernick Industrial Estate,
Penryn, Cornwall, TR10 9LU, UK
http://www.allen-heath.com
2 GR05 User Guide
Safety Warning !
Do not remove the cover while mains is connected. Mains voltage is dangerous
and can kill. Mains voltage is present within the unit. Do not carry out any work within the unit
while it is powered except for installation calibration. High voltage components are insulated for
safety but should not be touched with power applied. Do not attempt to remove the main circuit
assembly from the chassis. Refer service work to qualified service personnel only.
This equipment must be earthed. To ensure your safety the mains earth is connected to
the chassis through the power lead. Do not remove the mains earth connection.
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
L LIVE BROWN
N NEUTRAL BLUE
E EARTH GND GREEN & YELLOW
WIRE COLOUR
European
USA/Canada
BLACK
WHITE
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.
Precautions
Mains Voltage
The mains voltage setting is factory wired and is marked
on the rear panel. Check that this matches your local
mains supply. Ensure that the mains lead is fitted with
the correct safety approved mains plug.
Ventilation
The rear panel and top panel may run slightly warm.
This is normal. Do not completely cover the unit. Ensure
that there is adequate air flow around the unit.
Operating Environment
Moisture
Avoid liquid spillage and exposure to rain and moisture.
Should the unit become wet switch off and remove
mains power immediately. Allow the unit to dry out
completely before switching on again.
Cleaning
Avoid the use of chemicals, abrasives and solvents. The
panels are best cleaned with a soft brush and dry lintfree cloth.
Audio Connections
Protect from excessive dirt, dust, heat or cold and
vibration when operating, shipping or storing the unit.
Do not connect sources of AC or DC power or the output
of power amplifiers directly to the audio input or output
connectors.
GR05 User Guide 3
Welcome to the GR05
The GR05 is a 1U rack or desk mount audio zone mixer for installation applications such as
paging and background music systems in restaurants, retail outlets, leisure centres, clubs,
theatres, business offices etc. It has a flexible architecture which allows easy custom
configuration by the installer to exactly suit the requirements of the installation. Once installed it
presents a simple control interface for day to day operation by non-technical staff.
The GR05 has 2 microphone inputs and 3 stereo line inputs. These can be assigned to 4 zone
outputs configurable in mono or stereo pairs and controlled by front panel or remote level
controls. Ducking, EQ and muting can be configured. Further inputs and outputs are available
using the expander system.
The next page summarises the facilities which can be configured by the installer to satisfy the
needs of the installation.
Control Panel page 10
This has a simple layout for easy day to day control of
audio levels and zone switching by non-technical
operators. 3-colour LED indicators provide dynamic
indication of signal levels and system status.
The installer decides which controls are available to the
operator. Others can be removed, configured as preset
trimmers or locked out to prevent accidental operation.
Large write-on blocks allow custom identification of the
controls.
Connector Panel 11
Pluggable connectors are provided for all audio inputs
and outputs, the expander / remote facility, and mains
input. This allows the unit to be installed and removed
independent of the wiring harnesses.
The mains power switch is rear panel mounted to
prevent illegal operation. The unit serial number and
mains voltage setting is marked on the rear panel.
Gain trimmers are included to match the microphone
levels to the unit. These can be
configured for easy knob access, preset trimmers, or
locked out once set.
Cover 6
The top cover is removable to allow the installer to
configure the internal links and trimmers. Once
configured, the cover must be refitted.
Rack Ears 8
The two rack ears allow the unit to be mounted in a
standard 19” rack case along with other equipment in
the system. For desktop operation these may be
unscrewed and removed.
Plastic Feet 8
A set of plastic feet is fitted to the unit for desktop use.
These may be removed if required for rack mounting.
Hole Plugs 10
A bag of hole plugs is provided for front and rear panel
control lockout. Control knobs may be removed and the
front panel holes plugged to prevent the operator
changing the settings.
4 GR05 User Guide
The System
ALLEN&HEATH
GR05
AUDIO ZONE MIXER
The following diagram shows the GR05 in a typical sound contractor installation.
This combines paging microphones with background music sources feeding up
to 4 speaker zones. An alarm interface and battery backup are included to
ensure crowd control in the event of a fire or power failure. Remote level
controls are wall mounted for local speaker control.
Each installation has its own particular combination of input/output and control
requirements. For this reason the GR05 offers a uniquely flexible architecture
that can be installer configured for each application. We recommend that you
take time to fully understand the full capabilities of this unit and carefully plan the
most suitable configuration.
mic/line 2
mic/line 1 st line 3 st line 4 st li ne 5 out 1 out 3out 2 out 4 duckingmute power
Paging Microphone 12,18
This is the microphone used by the receptionist to call
for or ‘page’ staff or customers. It is set so that speaking
into the mic automatically overrides the background
music by reducing its level. This is known as ‘voiceover’
or ‘ducking’.
Announcement Microphone 12,18
Similar to the paging mic but usually kept behind the bar
or counter for occasional announcements or special
function use. Can be set to duck music sources, or be
itself ducked by the announcer for example when being
used as the karaoke mic.
Line Inputs 14
These are commonly the cassette or CD inputs for
background music. They may be stereo or mono.
Jukebox 19
The jukebox provides music selected and paid for by the
customer. As such it is a priority source that
automatically overrides any other background music
playing at the time.
Evacuation Alarm 19
It is often a safety requirement to link the audio system
to the fire alarm for automatic playback of an evacuation
message should the alarm be triggered. The prerecorded signal would override any background music
source.
Power Input 9
The GR05 has a built in mains operated power supply.
An additional input is provided to connect a backup
supply such as a battery unit which automatically takes
over should the mains power fail. This is important when
the unit is linked to an alarm system as described above.
Remote Level Control 17
+10V DC control inputs allow the GR05 VCA output
levels to be adjusted by volume controls positioned
away from the unit such as wall plates.
Zone Outputs 15
These provide 4 separate feeds to the amplifiers driving
the speakers in different areas or ‘zones’.
GR05 User Guide 5
Overview of Installation
Before starting make sure you have read this User Guide and understand the full
capabilities of the GR05. Plan the complete system first to decide how the
GR05 should be configured. Make sure you know the operating levels of the
equipment to be interconnected. To configure the unit you need to remove the
top cover and set internal links and trimmers. These adjust input and output
level matching, EQ, routing, ducking and level control. To complete the
installation configure the front and rear panel controls and set the unit for rack or
desk mounting. Log the details on the Configuration Sheet provided at the rear
of this guide. Remember to check the complete system for correct operation
after configuration.
The next page summarises the installation process. For full details on each
stage please refer to the page numbers indicated.
6 GR05 User Guide
Rack or Desk Mount
The GR05 is shipped with the two rack ears and its
plastic feet fitted. The unit will fit into a 1U space in a
standard 19” industrial rack case. Use the bolts
provided by the rack supplier to mount the unit in the
rack. Remove the feet if required. You can also use the
rack ears to mount the unit into a plinth.
For desktop or shelf operation the rack ears can be
removed. The plastic feet prevent the unit scratching the
mounting surface or slipping.
8
Plug up the Connectors 9,12-20
The wiring harnesses can be prewired and installed
before the unit is put in place. All connections are
pluggable. Connector types are 3-pin XLR for the
microphone inputs and zone outputs, RCA phono for the
stereo line inputs, and 25-pin D-type for the
expander/remote and battery interface. The mains input
is on standard 3-pin IEC connector.
Make sure that you allow enough length in the cables for
the unit to be removed for configuration.
Assign the Controls 10,11
The GR05 front panel level controls and rear panel gain
trimmers may be set in 3 ways: The knob is fitted for
user control, the knob may be removed so that it
becomes a preset trimmer adjustable using a slotted
screwdriver, or a plug may be fitted locking the control
so that it cannot be adjusted by the operator. It is
important to assign these so that the operator has
access only to those controls which need adjusting
during normal daily operation.
Front panel ident blocks are provided so that the
controls can be identified according to the application.
These can be marked using permanent pen, or adhesive
labels.
Remove the Cover
Switch off mains power before removing the cover.
To gain access to the configuration links and trimmers
remove the 8x M3 T10 Torx head screws and lift the top
cover away from the unit. Power may be re-applied while
adjusting the internal trimmers. Avoid the internal
power supply components. There are no adjustable
parts in the power supply.
Microphone Inputs 1,2 12
A balanced XLR input for each accepts a microphone or
mono line level signal. Adjust the sensitivity using the
rear panel gain trimmer. Use the meter LED to check for
correct signal level. Internal links provide options for an
attenuator pad, phantom power and lo-cut filter. Internal
trimmers adjust the EQ providing control of the low
frequency and mid/high frequencies, ideal for optimising
the tonal response of speech microphones.
Line Inputs 3,4,5 14
Each has a pair of RCA phono sockets for Left and Right
inputs. For mono sources only one need be used. To
mono a stereo source use the routing options as
described below. Use the internal jumper links to set the
sensitivity for high level +4dBu or low level –10dBV
equipment. Check for correct signal level using the
meter LEDs.
Routing Matrix 12,14
Internal link options let you route any input to any
combination of outputs. For example a stereo line input
could be routed to outputs 1 and 2 in mono and to
outputs 3 and 4 in stereo, or a microphone could be
routed to just one zone only. For each input to each
output set the link to ‘OFF’ for no routing, ‘VCA’ for
routing with level control and ducking, or ‘DIRECT’ for
routing without level control or ducking.
Outputs 15
The 4 outputs are line level on 3-pin XLR impedance
balanced connectors for interference rejection on long
cable runs. These have internal trimmers that adjust
between –10dBV low level and +4dBu high level for
signal matching and balance control. A 2band EQ with
internal trimmers lets you adjust the low and high
frequency response to match the speakers or room
acoustics. This can also be used to compensate for the
loudness effect when playing background music at low
volume.
Level and Ducking 16-19
Signals routed direct to the outputs are not affected by
level control or ducking. These would include paging
microphones, jukebox playback and alarm messages.
Signals routed through the VCAs to the outputs are
affected by level control and ducking.
Internal link options for each output determine whether
the level is controlled from the front panel or by +10V
remote. Front panel controls can be grouped for single
control of several outputs, for example a stereo zone.
The front panel mute switch can be set to control any
combination of outputs.
Internal and external ducking can be separately
configured to affect any combination of outputs. Internal
ducking is triggered by setting links for Mic1 or Mic2 or
both. Option links separately set internal and external
ducking depth and release time. Ducking can be set to
mute rather than reduce the signal, for example with
jukebox override.
Completion
After configuring the unit check the system for correct
operation. Refit the cover. Log the details on the
Configuration Sheet provided at the rear of this Guide.
GR05 User Guide 7
Positioning the Unit
The GR05 is built into a compact all steel case. This can fit into a standard 1U
19” rack space with the mounting ears provided. Alternatively the unit can be
desk or shelf mounted by removing the ears.
ALLEN&HEATH
mic/line 2
mic/line 1 st line 4 st line 5st line 3 out 4out 1 out 3out 2 duckingmute power
GR05
AUDIO ZONE MIXER
ALLEN&HEATH
mic/line 2
mic/line 1 st line 4 st line 5st line 3 out 4out 1 out 3out 2 duckingmute power
GR05
AUDIO ZONE MIXER
19” Rack Mount
The GR05 is shipped with the two rack mount ears and
its plastic feet already fitted. The unit may be mounted
in a 1U space in a standard 19” industrial rack case.
If space below the unit is tight, remove the feet using a
small slotted screwdriver to prise out the plastic rivets
from within the feet.
Use the mounting fixings provided by the supplier of the
rack case. These are usually black or chrome plated M6
bolts that seat in black plastic cups to prevent damage
to the equipment panels. All four mounting fixings
should be fitted.
Avoid positioning the unit or audio cables too close
to equipment such as power amplifiers, power
supplies or computer monitors which emit high
levels of radiated interference.
Avoid positioning the unit directly above or below
equipment which generates large amounts of heat
such as power amplifiers or power supplies.
Desktop or Shelf Mount
Desktop or shelf mounting may be required where the
unit is operated by a receptionist or bar staff.
To configure the GR05 for desktop or shelf mounting
remove the two rack ears. Use a T10 Torx screwdriver to
remove the 3 M3 fixing screws on each side. Ensure the
4 plastic feet are fitted to the base of the unit.
Allow enough space behind the unit for the
connecting plugs and cables. Do not completely
cover the unit. To prevent excessive heat build up
ensure adequate ventilation around the unit.
8 GR05 User Guide
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