Cambridge Audio 540A, 640A User Manual
azur 540A/640A V2.0
Integrated amplifier
User’s manual
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
540A/640A V2.0 Integrated 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 predriver 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
4 Azur integrated amplifier
Checking the Power Supply Rating
For your own safety please read the following instructions carefully before attempting
to connect this unit to the mains.
Check that the rear of your unit indicates the correct supply voltage. If your mains
supply voltage is different, consult your dealer.
This unit is designed to operate only on the supply voltage and type that is
indicated on the rear panel of the unit. Connecting to other power sources may
damage the unit.
This equipment must be switched off when not in use and must not be used unless
correctly earthed. To reduce the risk of electric shock, do not remove the unit's
cover (or back). There are no user serviceable parts inside. Refer servicing to
qualified service personnel. If the power cord is fitted with a moulded mains plug
the unit must not be used if the plastic fuse carrier is not in place. Should you lose
the fuse carrier the correct part must be reordered from your Cambridge Audio
dealer.
The lightning flash with the arrowhead symbol within an equilateral
triangle is intended to alert the user to the presence of un-insulated
‘dangerous voltage’ within the product’s enclosure that may be of
sufficient magnitude to constitute a risk of electric shock to
persons.
The exclamation point within an equilateral triangle is intended to alert
the user to the presence of important operating and maintenance
instructions in the service literature relevant to this appliance.
This product complies with European Low
Voltage (73/23 /EEC) and Electromagnetic Compatibility
(89/ 336/EEC) Directives when used and installed according to
this instruction manual. For continued compliance only
Cambridge Audio accessories should be used with this product
and servicing must be referred to qualified service personnel.
The crossed-out wheeled bin is the European Union symbol for
indicating separate collection for electrical and electronic
equipment. This product contains electrical and electronic
equipment which should be reused, recycled or recovered and
should not be disposed of with unsorted regular waste. Please
return the unit or contact the authorised dealer from whom you
purchased this product for more information.
Plug Fitting Instructions (UK Only)
The cord supplied with this appliance is factory fitted with a 13 amp mains plug
fitted with a 3 amp fuse inside. If it is necessary to change the fuse, it is important
that a 3 amp one is used. If the plug needs to be changed because it is not suitable
for your socket, or becomes damaged, it should be cut off and an appropriate plug
fitted following the wiring instructions below. The plug must then be disposed of
safely, as insertion into a 13 amp socket is likely to cause an electrical hazard.
Should it be necessary to fit a 3-pin BS mains plug to the power cord the wires
should be fitted as shown in this diagram. The colours of the wires in the mains
lead of this appliance may not correspond with the coloured markings identifying
the terminals in your plug. Connect them as follows:
The wire which is coloured BLUE must be
connected to the terminal which is marked
with the letter ‘N’ or coloured BLACK.
The wire which is coloured BROWN must be
connected to the terminal which is marked
with the letter ‘L’ or coloured RED.
The wire which is coloured GREEN/YELLOW
must be connected to the terminal which is
marked with the letter ‘E’ or coloured GREEN.
If your model does not have an earth wire, then disregard this instruction.
If a 13amp (BS 1363) plug is used, a 3amp fuse must be fitted, or if any other type
of plug is used a 3amp or 5 amp fuse must be fitted, either in the plug or adaptor,
or on the distribution board.
SAFETY PRECAUTIONS
540A/640A V2.0 Integrated amplifier
Azur integrated amplifier 5
IMPORTANT SAFETY INSTRUCTIONS
Please take a moment to read these notes before installing your Azur
amplifier, they will enable you to get the best performance and prolong
the life of the product. We advise you follow all instructions, heed all
warnings and keep the instructions for future reference.
The unit is of Class 1 construction and must be connected to a Mains
socket outlet with a protective earthing connection.
The unit requires ventilation above and below. Do not situate it on a rug
or other soft surface and do not obstruct any air inlet or outlet grilles on
the underside and top cover. Do not place in an enclosed area such as
a bookcase or in the cabinet.
Do not install near any heat sources such as radiators, heat register,
stove, or other apparatus (including amplifiers) that produce heat.
Do not defeat the safety purpose of the polarized or grounding type plug.
A polarized plug has two blades with one wider than the other. A
grounding type plug has two blades and a third grounding prong. The
wide blade or third prong are provided for your safety. If the provided
plug does not fit your outlet, consult an electrician for replacement of
the obsolete outlet.
WARNING - To reduce the risk of fire or electric shock, do not expose this
unit to rain or moisture. This unit must not be exposed to dripping or
splashing water or other liquids. No objects filled with liquid, such as
vases, shall be placed on the unit. In the event, switch off immediately,
disconnect from the mains supply and contact your dealer for advice.
Ensure that small objects do not fall through any ventilation grille. If this
happens, switch off immediately, disconnect from the mains supply and
contact your dealer for advice.
Do not route the power cable so that it can be walked upon or damaged
by other items near it.
It is recommended that when bi-amping, the same type power amplifiers
are used.
This unit must be disconnected from the mains socket to be turned off
completely. If you do not intend to use this unit for a long period of time,
unplug it from the mains socket. Unplug this unit during lightning
storms.
To clean the unit, wipe its case with a moist, lint-free cloth. Do not use
any cleaning fluids containing alcohol, ammonia or abrasives. Do not
spray an aerosol at or near the amplifier.
This unit is not user serviceable, never attempt to repair, disassemble or
reconstruct the unit if there seems to be a problem. Servicing is required
when the unit has been damaged in any way, such as power-supply cord
or plug is damaged, liquid has been spilled or objects have fallen into it,
the unit has been exposed to rain or moisture, does not operate
normally or has been dropped. A serious electric shock could result if
this precautionary measure is ignored.
This unit should be installed on a sturdy, level surface. Due to stray
magnetic fields turntables should not be located nearby due to
interference.
6 Azur integrated amplifier
Power On/Off
Switches the unit on and off.
Mains voltage selector switch
Switches the mains voltage between 115V and 230V. For use by
installer/dealer only.
AC power socket
Once you have completed all connections to the amplifier, plug the AC
power cable into an appropriate mains socket. Your amplifier is now
ready for use.
Loudspeaker terminals
Two sets of loudspeaker terminals are available, A (main loudspeaker
terminals) and B (secondary switchable loudspeaker terminals).
Connect the wires from your left channel loudspeaker to the LEFT + & terminals, and the wires from the right channel loudspeaker to the
RIGHT + & - terminals. In each case, the red terminal is the positive
output and the black terminal is the negative output.
Care should be taken to ensure no stray strands of wire are shorting speaker
outputs together. Please ensure that the loudspeaker terminals have been
tightened adequately to provide a good electrical connection. It is possible
for the sound quality to be affected if the screw terminals are loose.
Note: When using one pair of speakers, use speakers with a nominal
impedance of between 4-8 ohms. When using two pairs of speakers,
use speakers with a nominal impedance of between 6-8 ohms each.
IR (Infrared) Emitter In
Allows modulated IR commands from multi-room systems to be received by
the amplifier. Commands received here are not looped out of the Control
Bus. Refer to the ‘Custom Installation’ section for more information.
REAR PANEL CONNECTIONS
1
2
3
1
3
2
4
5
7
6
4
111098
5
Designed in London, England
www.cambridge-audio.com
Max Power Consumption: 700W
Caution
Risk of electric shock. Do not open.
Avis
Risque de choc electrique. Ne pas ouvrir.
Achtung
Vorm öffnen des gerätes. Netzstecker ziehen.
Manufactured in an
ISO9002 approved facility
On Off
Mains Voltage Selector Switch
115V/230V AC~50/60Hz
Power
Power AC
CAP5
Protection LED
indicators:
Fault requiring
service (DC)
Over temperature
Temporary overload
Loudspeaker short
Vol Auto
Clipping
Please refer to
your User's Manual
for more information
N1863
A
Impedance 4 - 8 ohms
B
LeftRight Right
Left
Right Left Right Left
Impedance 4 - 8 ohms
Loudspeaker Terminals
Please ensure that loudspeaker terminals are fully tightened
Veuillez s'assurer que les bornes de l'enceinte sont entièrement serrées
BA
Important
Multi-Room
IR EmitterInPSU
Keypad 1
In
Pre-Out
Tape I n
Left
Right
Pre-Out Tape In Rec Out 1 Rec Out 2 DMP / MP3 DVD Tuner / DAB CD Aux
Caution
Risk of electric shock. Do not open. Avis Risque de choc electrique. Ne pas ouvrir. Achtung Vorm öffnen des gërates. Netzstecker ziehen.
International Patent Pending LeisureTech Electronics Pty Ltd
Rec Out 2
Rec Out 1
Keypad 2
DMP / MP3DVD
IR1
IR2 IR4
azur 640A Integrated Amplifier V2.0
IR3
Control Bus
In Out
Tuner / DAB
CD
Aux
Left
Right
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