4 GR8A USER GUIDE
Welcome to the Allen & Heath GR8A
The GR8A is one of a range of architectural sound products in the Allen & Heath Contractor Series. It
is an 8 channel audio power amplifier designed to work with multi-output zoning mixers such as the
Allen & Heath GR05, GR1, DR128 and DR66. Modern amplifier technology has enabled the GR8A to
achieve multi-channel high power output in a relatively small case size. Much time and effort has been
invested into making the GR8A an excellent performing, reliable and cost effective solution wherever
multi-channel audio is required. The GR8X transformer rack option is available from Allen & Heath to
enable the amplifier to drive 70V or 100V loudspeaker systems.
This user guide presents a quick reference to the function and application of the GR8A. We
recommend that you read this guide fully before starting. Whilst we believe the information presented 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.
Main Features
• 8 Independent audio power amplifiers in a 2U chassis with removable rack ears
• 60W per channel into 4 ohms, 40W into 8 ohms
• Outputs bridgeable for 120W into 8 ohms
• Balanced XLR inputs with common mono/stereo source switching in groups of four
• Speaker outputs on Phoenix type removable screw terminal connectors
• 3 Colour input signal metering
• Selectable output monitoring on headphones or local speaker
• Full output protection and 3 speed fan cooled temperature management system
• Battery power backup facility
• Remote output ‘standby’ control per channel
Service And Technical Support
Under normal operating conditions the GR8A does not require user maintenance or calibration apart
from occasional vacuuming of the air intake filter should it become ingrained with dust.
To avoid damage to internal components by mishandling and/or misconnection, service
work should be referred only to technically competent personnel.
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 product range,
assistance with your technical queries or simply to chat about audio matters. To help us provide the
most efficient service please keep a record of the serial number, date and place of purchase to be
quoted in any communication regarding this product.
General Precautions
Your GR8A is ruggedly constructed to give many years of reliable operation. However, you will extend
the life of the amplifier and preserve its cosmetics by applying these simple common sense
precautions:
Avoid storing or using the amplifier in conditions of excessive heat or cold, or in positions where it is
likely to be subject to vibration, dust, smoke, dirt or moisture. Do not use any liquids to clean the
control surface of the unit. Use a soft dry brush or dry lint-free cloth. Check the air intake dust filter
regularly and vacuum from the outside to remove dust build up as necessary. Avoid using the amplifier
close to strong sources of electromagnetic radiation such as video monitors, mains and high power
electric cabling.
Do not remove the service cover. There are no user serviceable parts inside. All the controls and
installation settings for the unit are accessible from the outside.
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