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Contents Introduction
Introduction.............................................................................................. 2
Important safety instructions.................................................................. 3
Limited warranty...................................................................................... 4
Rear panel connections .......................................................................... 5
Connections ............................................................................................. 6
Front panel controls................................................................................. 9
Apple device compatibility....................................................................... 10
Remote control......................................................................................... 10
Custom installation (C.I.) use.................................................................. 11
CAP5: Five-way protection system .......................................................... 11
Technical specifications........................................................................... 12
Troubleshooting........................................................................................ 12
Thank you for purchasing this 651A Amplifier. We are confident that you
will enjoy many years of listening pleasure from it. Like all Cambridge
Audio products the 651A adheres to our three core principles – stunning
performance, ease of use and incredible value.
Developed as part of our on-going research and development regime,
including extensive listening tests, we have incorporated many subtle
tweaks and improvements to our circuits, components and layouts in the
pursuit of our passion for sound quality.
Very high quality components are used throughout including an Alps
volume pot, polypropylene signal capacitors, gold-plated speaker outputs,
custom-made electrolytic capacitors in critical positions and several new
circuit tweaks. The amplifier is a completely discrete bipolar transistor-
based circuit honed over many years powered from a bespoke
audiophile-grade toroidal transformer.
Also featured is an environmentally friendly low power (<1W) standby
circuit. This circuit completely powers down the amplifier circuits in
Standby mode yet is itself totally isolated when the amplifier is on, thus
having no effect on sound quality.
All this proprietary engineering is housed within our low resonance,
acoustically damped chassis. An Azur Navigator remote control is also
provided, giving full remote control of your amplifier in an attractive and
easy to use handset.
Remember your 651A can only be as good as the system it is connected
to. Please do not compromise on your source equipment, speakers or
cabling.
Naturally we particularly recommend source components from the
Cambridge Audio Azur range which includes CD players, BD/DVD/SACD/
DVD players, iPod docks and Network players which have been designed
to the same exacting standards as this amplifier.
Your dealer can also supply excellent quality Cambridge Audio
interconnects to ensure your system realises its full potential.
Thanks for taking the time to read this manual, we do recommend you
keep it for future reference.
Matthew Bramble
Cambridge Audio Technical Director
and the 651A design team
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This guide is designed to make installing and using this product
as easy as possible. Information in this document has been
carefully checked for accuracy at the time of printing; however,
Cambridge Audio's policy is one of continuous improvement,
therefore design and specifications are subject to change
without prior notice.
This document contains proprietary information protected by
copyright. All rights are reserved. No part of this manual may be
reproduced by any mechanical, electronic or other means, in any
form, without prior written permission of the manufacturer. All
trademarks and registered trademarks are the property of their
respective owners.
© Copyright Cambridge Audio Ltd 2011