Page 1
2 Azur integrated amplifier Introduction ........................................................................\
.........................3
Safety precautions ........................................................................\
..............4
Important safety instructions .....................................................................5
Rear panel connections........................................................................\
......6
Connecting........................................................................\
...........................8
Front panel controls ........................................................................\
..........10
Remote control........................................................................\
..................12
Custom installation use ........................................................................\
...12
Multi-Room ........................................................................\
........................13
CAP5 protection system ........................................................................\
...14
Troubleshooting........................................................................\
.................16
Technical specifications ........................................................................\
...17
Limited warranty ........................................................................\
...............18
CONTENTS
Page 2
540A/640A V2.0Integrated amplifier
Azur integrated amplifier 3
Thank you for purchasing this Cambridge Audio Azur range amplifier.
These version 2 models are part of our commitment to the on-going
development of the Azur range. We hope that you will appreciate the
results and enjoy many years of listening pleasure from them.
For these version 2 models we have been able to further improve the
audio quality and make them more powerful through many detailed
changes and enhancements developed as a result of our on-going
research programme. We have also added some new features, including
support for Multi-Room use. 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.
About the 540A V2.0
The 540A V2.0 features a new preamp stage with buffered inputs for
lower crosstalk and improved stereo imaging, whilst the headphone
output is now provided be a separate Class A headphone driver circuit.
The amplifier stage has been revised with new low-noise input
transistors, special driver stage PSU regulation, a new voltage amplifier
topology and separate current sources for the voltage amplifier and pre-
driver stages. These enhancements to the original circuits all work to
elevate the sound quality to a new level. A new heatsink and transformer
are employed and the power output is now 60 watts per channel (from
50 wpc on the V1 model).
About the 640A V2.0
Featuring all of the above enhancements, the 640A V2.0 also features
separate transformer secondaries for left and right channels, twin
rectifiers and separate PSU's for dual mono operation of the left and
right power amplifiers. An even larger heatsink and transformer are
employed and power output is now 75 watts per channel (from 65wpc
on the V1 model).
Incognito Ready / Custom Install Use
Both the 540A V2.0 and 640A V2.0 now feature outputs for the new
Cambridge Audio Incognito system. By plugging in one or two external
Incognito Keypads and a power supply unit your V2.0 amplifier can
become the hub of a simple multi-room system. In addition, Control Bus
Input/Output and IR Emitter Input are provided to make it easy to
integrate these units into Custom Installation systems.
Your V2.0 amplifier 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 models from the
Cambridge Audio Azur range, which have been designed to the same
exacting standards as our amplifiers. 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
Technical Director
INTRODUCTION
