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GR8A

 

U

SER 

G

UIDE

 

 

 

 

 

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. 

Any changes or modifications to the equipment not approved by Allen & Heath 
could void the compliance of the equipment and therefore the users authority to 
operate it. 

 

GR8A User Guide AP4298 Issue 2. 

Copyright © 2001 Allen & Heath Limited.  All rights reserved 

 

Manufactured in the United Kingdom by  

Allen & Heath Limited 
Kernick Industrial Estate, Penryn, Cornwall, TR10 9LU, UK 
 
http://www.allen-heath.com 

 

Limited One Year Warranty   

This product has been manufactured in the UK by ALLEN & HEATH and 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 or 
its authorised agent as soon as possible for repair under warranty subject to the 
following conditions 

Conditions Of Warranty   

The equipment has been installed and operated in accordance with the 
instructions in this User Guide 

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. 

Any necessary adjustment, alteration or repair has been carried out by ALLEN & 
HEATH or its authorised agent. 

The defective unit is to be returned carriage prepaid to ALLEN & HEATH or its 
authorised agent with proof of purchase. 

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. 

Содержание GR8A

Страница 1: ...8 Channel Amplifier GR8A USER GUIDE Publication AP4298 ...

Страница 2: ... 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 or its authorised agent as soon as possible for repair under warranty subject to the following conditions Conditions Of Warranty The equipment has been installed and operated in accordance wit...

Страница 3: ... remove this connection CONTENTS Warranty 2 Safety Warnings 3 Welcome to the Allen Heath GR8A 4 General Precautions 4 Specifications 5 Front Panel Controls 6 Rear Panel Controls and Connectors 7 Installation 9 Operation 10 Block Diagram 11 SAFETY WARNING Mains electricity is dangerous and can kill Mains voltage is present within the GR8A Do not remove the top cover There are no user serviceable pa...

Страница 4: ... 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 pers...

Страница 5: ... into 8 ohms Peak transient power Unbridged 130W into 4 ohms Bridged 250W into 8 ohms Slew rate 10V uS Frequency response 20Hz to 20kHz 0 0 5dB Total Harmonic Distortion 6W into 8 ohms 1kHz 0 03 Signal to noise ratio Relative to 60W into 4 ohms 100dB Stand by Separate control per channel Control Switch common 15V to channel pin Attenuation 80dB Inter channel Crosstalk relative to 60W into 4 ohms 1...

Страница 6: ...ontrol that adjusts its level from fully off to maximum sensitivity In bridged mode the odd numbered channel control sets the overall level and the even numbered control is not used Use the level controls to match the amplifiers to the connected source equipment set maximum volume allowed or adjust the balance between different outputs Blanking plugs are provided for situations where tamper proof ...

Страница 7: ...d and wired pin 2 hot Input sensitivity is 4dBu for rated power output Good quality 2 core screened signal cable should be used for these inputs to avoid signal degradation or interference pickup over long cable runs Use balanced connections where possible INPUT MODE switches Three tamperproof underpanel switches configure the inputs to allow different combinations of common input sourcing Use the...

Страница 8: ...o select bridge mode using a pen or similar pointed object This configures two amplifiers to work together into one speaker Use bridge mode when you need a lot more amplifier power to drive a single speaker BRIDGE MODE Use the odd numbered channel input and controls The even numbered input is disabled You should blank off the unused level controls using the plugs provided The front panel BRIDGE in...

Страница 9: ...nd screened cables for the inputs If you have problems with ground loops lift the screen connection at one end of the input cables or operate the source equipment ground lift switches Use adequately rated speaker wire for the outputs Input cables may be run together but outputs should be separated to avoid interaction between the amplifiers Route all input and output cables away from mains compute...

Страница 10: ...amplifier level controls to correct the signal matching These controls can also be used to preset the maximum volume allowed for each output or to balance the volume between different outputs Remove the knobs and fit the blanking plugs provided with the unit if you wish to lock the controls and make them tamperproof Metering A 3 colour signal meter indicator is provided for each channel to monitor...

Страница 11: ...GR8A USER GUIDE 11 BLOCK DIAGRAM ...

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