Cambridge Audio AZUR 651A User manual

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8
Cambridge
Audio
Contents
Introduction.
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Importantsafety instructions.............
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Limited warranty
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Rear panel connections ........
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Connections ..........
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Front panel controls.........
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Apple device compatibility....
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Remote control.......................
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Custom installation
(C.
I.)
use
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CAP5:
Five-way
protection system
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Technical specifications........
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Troubleshooting......
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Make sure you register your purchase.
Visit: www.cambridgeaudio.comjsts
By
registering, you'll
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This
gu
ide is designed
to
make installingand usingthis 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
ar
e 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 orother 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
'--~
~-------------------
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2
Introduction
Thankyou for purchasingthis
651A
Amplifier.
We
are confident
that
you
will enjoy many years
of
listening pleasure
from
it. Like all Cambridge
Audio productsthe
651A
adheresto our three core principles
-stunning
performance, ease
of
use and Incrediblevalue.
Developed as
part
of
our on-going research and development regime,
including extensive listening tests,
we
have incorporated many subtle
tweaks and improvements
to
ourcircuits, 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 itselftotally 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 chassi
s.
An
Azur Navigator remote control is also
provided, givingfull remote control
of
your amplifier in an attracti
ve
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.
fL
..
~~l
Matthew Bramble
Cambridge Audio Technical Director
and the 651A design team

Important safety instructions
For
your
own
safety
please read the following important safety
instructions careYully before attemptingto connect this unitto the mains
power
supply.
They
will also enable
you
to getthe best performance from
and
prolong the
life
of
the unit:
1.
Read
these
instructions
.
2.
Keep
these instructions.
3.
Heed
all warnings.
4.
Follow
all inst:ructions.
5.
Do
not use
this
apparatus near water.
6.
Clean
only
with
a dry cloth.
7.
Do
not block any ventilation openings. Install
in
accordance with the
manufacturer's instructions.
8.
Do
not install near any heat sources such as radiators,heat registers,
stoves,
or
other
apparatus (including other amplifiers) that produce
heat.
9.
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.
Agrounding-
type
plug has two blades and a third grounding prong.
The
wide
blade
or the third prong are provided for your safety. Ifthe
provided
plug
does not fit into your outlet, consult an electrician for
replacement
of
the obsolete outlet.
10
. Protect the
power
cord from being walked
on
or pinched, particularly
atplugs,convenience receptacles and the point where they exit from
the
apparatus.
11
.
Only
use attachments/accessories specified
by
the manufacturer.
12.
Use
with
only
the cart, stand, tripod, bracket, or table •
specified
by
the
manufacturer, or sold with the apparatus.
When
a
cart
is used, use caution when moving the
cart;
apparatus combination to avoid injury from tip-over.
13
. Unplug this apparatus during lightning storms or when unused for
long
periods
of
time.
14.
Refer
all servicingto qualified service personnel. Servicing
is
required
when
the
apparatus
has been damaged in any
way,
such as the
power-supply cord or plug having been damaged, liquid has been
spilled or objects have fallen into the apparatus, the apparatus has
been
exposed to rain or moisture, does not operate normally, or has
been
dropped.
WARNING
-To
reduce the
risk
of
fire or electric shock, do not expose this unit to
rain or moisture.
-Batteries (battery pack or batteries installed) shall not
be
exposed to
excessive heat such as sunshine, fire or the like.
The
unit is
of
Class 1 construction and must
be
connected to a mains
socket outlet with a protective earthing connection.
The
unit must
be
installed
in
a manner that makes disconnection
of
the
mains plug from the mains socket outlet (or appliance connector from
the rear
of
the unit) possible. Where the mains plug is used as the
disconnect device, the disconnect device shall remain readily operable.
Only
use
the mains cord supplied with this unit.
Please ensure there
is
ample ventilation.
We
recommend that
you
do not
place the unit
in
an
enclosed space; if
you
wish to place the unit
on
a
shelf, use the top
shelf
to allow maximum ventilation.
Do
not put any
objects on top
ofthis
unit.
Do
notsituate
it
on
a rug or other soft surface
and do not obstruct any air inlets or outlet grilles.
Do
not cover the
ventilation grilles with items such as newspapers, tablecloths, curtains,
etc.
This
unit must not
be
used nearwater or exposed to dripping orsplashing
water or other liquids.
No
objects filled with liquid, such as vases,shall
be
placed
on
the unit.
azur
651A
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.
WEEEsymbol
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.
(
~
CEmark
~
This product complies with European
Low
Voltage
(2006/95/EC), Electromagnetic Compatibility (2004/108/EC)
and Environmentally-friendly design
of
Energy-related Products
(2009
/125/EC) 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.
C
C-lick
mark
This
product meets the
Australian Communications Authority's
Radio communications and
EMC
requirements.
~
Gost-R
stamp
,....
This product meets Russian electronic safety approvals.
FCC
regulations
NOTE:
THE
MANUFACTURER
IS
NOT
RESPONSIBLE
FOR
ANY
RADIO
OR
TV
INTERFERENCE
CAUSED
BY
UNAUTHORIZED
MODIFICATIONS
TO
THIS
EQUIPMENT.
SUCH
MODIFICATIONS
COULD
VOID
THE
USER
AUTHORITY
TO
OPERATE
THE
EQUIPMENT.
~
This
equipment has been tested and found to comply with the
~
limits for a Class B digital device, pursuant to Part
15
of the
FCC
Rules. These limits are designed to provide reasonable
protection against harmful interference
in
a residential installation. This
equipmentgenerates, uses and can radiate radio frequency energy and,
if
not installed and used
in
accordance with the instructions, may cause
harmful interference to radio communications. However, there is
no
guarantee that interference will not occur
in
a particular installation.
Ifthis equipment does cause harmful interference to radio or television
reception, which can
be
determined
by
turningthe equipment
off
and on,
the user
is
encouraged to try to correct the interference
by
one or more
of
the following measures:
-Re-orient or relocate the receiving antenna.
-Increase the separation between the equipment and receiver.
-Connect the equipmentinto
an
outlet on a circuit differentfrom thatto
which the receiver is connected.
-Consult the dealer or
an
experienced radio/
TV
technician for help.
3
I

8 Cambridge Audio
Ventilation
IMPORTANT- The unitwill become hotwhen in use. Do notplace anything
on top
of the unit. Do not place in an enclosed area such as a bookcase
or in a cabinet without sufficient ventilation.
Ensure
that small objects do notfall through any ventilation grille. If this
happens, switch off immediately, disconnect from the mains supply and
contact your dealerfor advice.
Positioning
Choose the installation location carefully. Avoid placing it in directsunlight
or close to a source of heat. No naked flame sources, such as lighted
candles, should be placed on
the unit. Also avoid locations subject to
vibration and excessive dust , cold or moisture. The unit can be used in a
moderate climate.
This unit must be installed on a sturdy, level surface.
Do not place in a
sealed area such asa bookcase or in a cabinet.
Do not place the unit on
an unstable surface
or shelf. The unit may fall, causing serious injury to
a child or adult as well as serious damage to the product. Do not place
otherequipment on top
of the unit.
Due to stray magnetic fields, turntables or CRT TVs should not be located
nearby due to possible interference.
Electronic audio components have a running
in period of around a week
(if used several hours per day). This will allow the new components to
settle down and
the sonic properties will improve over this time .
Power sources
The unit should be operated only from the type of power source indicated
on the marking label. If you are not sure of the type of power-supply to
your home, consult your product dealer or local power company.
This unit can
be left in Standby mode when not in use and will draw <1W
in this state. To turn the unit off, switch off at the rear panel. If you do not
intend to use this
unit for a long period of time, unplug it from the mains
socket.
Overloading
Do notoverload wall outlets or extension cords as thiscan result in a risk
of fire or electric shock. Overloaded AC outlets, extension cords, frayed
power cords, damaged or cracked wire insulation and broken plugs are
dangerous.They may result in a shock or fire hazard.
Be sure to inserteach power cord securely. To prevent hum and noise, do
not bundle the interconnect leads with the power cord or speaker leads.
Cleaning
To clean the unit, wipe its case with a dry, lint-free cloth. Do not use any
cleaningfluids containing alcohol, ammonia or abrasives.
Do notspray an
aerosol
at or nearthe unit.
Battery disposal
Please dispose of any discharged batteries according to local
environmental/electronic waste disposal guidelines.
Loudspeakers
Before making any connections to loudspeakers, make sure all power is
turned
off and only use suitable interconnects.
Servicing
These units are not user serviceable. Never attempt to repair,
disassemble or reconstruct
the unit if there seems to be a problem.
A serious electric shock could result
if this precautionary measure is
ignored.
In the event of a problem or failure, please contact your dealer.
4
Limited warranty
Cambridge Audio warrants this product to be free from defects in
materials and workmanship (subject to the terms set forth below).
Cambridge Audio will repair or replace (atCambridge Audio's option)
this
product or any defective parts in this product. Warranty periods mayvary
from country to country. If in doubt consult your dealer and ensure
that
you retain proof of purchase.
To obtain warranty service, please contact the Cambridge Audio
authorised dealer from which
you purchased this product. If your dealer
is not equipped to perform
the repair of your Cambridge Audio product,
it can be returned by your dealer to Cambridge Audio or an authorised
Cambridge Audio service agent.
You will need toship this product in either
its original packaging
or packaging affording an equal degree of
protection.
Proof
of purchase in the form of a bill of sale or receipted invoice, which
is evidence
that this product is within the warranty period, must be
presented to obtain warranty service.
This Warranty is invalid
if (a) the factory-applied serial number has been
altered
or removed from this product or (b) this product was not
purchased from a Cambridge Audio authorised dealer. You may call
Cambridge Audio
or your local country Cambridge Audio distributor to
confirm that you have an unaltered serial number and/or you made a
purchase from a Cambridge Audio authorised dealer.
This Warrantydoes notcover cosmetic damage
or damage duetoacts of
God, accident, misuse, abuse, negligence, commercial use, or
modification of, or to any part of , the product. This Warranty does not
cover damage dueto improperoperation, maintenance or installation, or
attempted repair by anyone other than Cambridge Audio or a Cambridge
Audio dealer,
or authorised service agent which is authorised to do
Cambridge Audio warranty work.
Any unauthorised repairs will void this
Warranty. This Warranty does not cover products sold AS IS or WITH ALL
FAULTS .
REPAIRS OR REPLACEMENTS AS PROVIDED UNDER THIS WARRANTY ARE
THE EXCLUSIVE REMEDY OF THE CONSUMER. CAMBRIDGE AUDIO SHALL
NOT BE LIABLE FOR ANY INCIDENTAL OR CONSEQUENTIAL DAMAGES FOR
BREACH OF ANY EXPRESS OR IMPLIED WARRANTY IN THIS PRODUCT.
EXCEPT TO THE EXTENT PROHIBITED BY LAW, THIS WARRANTY IS
EXCLUSIVE AND IN LIEU OF ALL OTHER EXPRESS AND IMPLIED
WARRANTIES WHATSOEVER INCLUDING, BUT NOT LIMITED TO, THE
WARRANTY OF MERCHANTABILITY AND FITNESS FOR A PRACTICAL
PURPOSE.
Some countries and US states do not allow the exclusion or limitation of
incidental or consequential damages or implied warranties so the above
exclusions may
not apply to you. This Warranty gives you specific legal
rights, and
you may have other statutory rights, which vary from state to
state or country to country.
For any service,
in or out of warranty, please contact your dealer.
Plug-fitting Instructions (UK only)
The cord supplied with this appliance is factory-fitted with a UK mains plugfitted with
a 5-amp fuse inside. If it is necessary to change the fuse,
it is important that a
5-amp fuse
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 mains 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 notcorrespond with the coloured markings identifyingthe 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.
BLUE
N
FUSE
If a standard 13-amp (BS 1363) plug is used, a 5-amp fuse must be fitted or, if any
othertype of plug
is used, a 5-amp fuse must be fitted, either in the plugoradaptor,
oron the distribution board.

Rear panel connections
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@ Power On/Off
Switches the unit on and off . This switch is a master on / off control that
completely powers down the unit.
® AC power socket
Once you have completed all connections to the amplifier, plug the
AC power cable into an appropriate mains socket and turn the unit on.
Your amplifier is now ready for use.
® Loudspeaker terminals
Two sets of loudspeaker terminals are available, A (main loudspeaker
terminals, top row) and B (secondary switchable loudspeakerterminals,
bottom
row) .Connect the wires from your leftchannel loudspeakertothe
LEFT positive and negative terminals, and the wires from the right
channel loudspeaker
to the RIGHT positive and negative 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 loudspeakerterminals
have been tightened adequately to provide a good electrical connection.
It is possible forthe sound qualityto
be affected if the screw terminals are
loose.
The use of Aand B speakers affords you an easy and inexpensive way to
create a simple multi-room system.
Note: When using two pairs
of speakers, use speakers with a minimum
nominal impedance
of 8 ohms.
@ IR (Infrared) Emitter In
Allows modulated IR commands from multi-room systems or IR repeater
systems to
be received by theamplifier.Commands received here are not
looped out
of the Control Bus. Refer to the 'Custom Installation' section
for more information.
® Control Bus
In Allows un-modulated commands from multi-room systems or other
components to
be received by the unit.
Out Loop outfor control bus commands to another unit.
® SuiK>ut
This output can be used to connect to a subwoofer, if desired.
azur 651A
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0 Pre-Out
These outputs can be used toconnecttothe inputs on an external power
amplifier
or an active subwoofer, etc.
® Record Out 1/2
These two identical output sockets can be connected to a tape deck or
to the analogue Record
In sockets on a MiniDisc or CD recorder etc.
®51-55
These inputs are suitable for any 'line level' source equipment such as
BD / DVD players, DAB or FM / AM tuners, CD players, Netwok Players, iPod
docks, MP3 players, etc.
Note: These inputs are for analogue audio signals only.
They should not
be connected to the digital output of a CD player or any other digital
device.
Connecting a turntable
If it is desired to connect a turntable without a built-in phono stage, an
external phono stage such asour551P or 651P models should
be used.
Contact your Cambridge Audio dealerfor more details.
Note: Avery few turntables have built-in phono stages,
in which case it is
not necessary to use a separate phono stage amplifier. If
you ' re unsure,
please consult your turntable user manual.
@ USB interface
A USB Btype socket is fitted tothe 651A to enable the playback of audio
from a personal computer runningeither MicrosoftWindows or Apple Mac
OS Xoperating systems. Some bu ilds of Linux are also suitable.
Note: Always use a certified cable for
USB Audio preferably one that
displays an official mark. USB cable connections longer than 3m may
result in inconsistentaudio performance.
Always turn the Volume to minimum, or turn the
651A off before plugging/unplugging cables to the
USB input or whilst booting up your PC /Mac.
s
I
\

8
Cambridge
Audio
Connections
Basic
connection
Note:
Before
making
any
connections,
make
sure
that
the
651A
is
turned
off.
When designing our amplifiers
we
include features
that
allow you to
connect your system in various
ways
.
The
inclusion
of
features such as
Pre-Out and Speaker Bconnections mean
that
you
can flexibly configure
your system depending on your requirements.
The diagram below shows
the
basic connection
of
your amplifier
to
a
CD
player and a pair
of
loudspeakers.
Right
speaker
Amplifier
CD
player
~
t
Record
out
connection
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The
diagram below shows how to connect the amplifier toa tape recorder
or other component with a record function. Please note
that
either
of
the
record outputs can
be
used (as theyare both the same signal
in
parallel).
6
Right
speaker
Amplifier
Tape/MD player
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Left
speaker
Left
speaker

Speaker B
connections
The
Speaker Bconnections
on
the back
of
the amplifier allowfor a second
set
of
speakers
to
be
used
(i
.
e.
speakers located in
another
room).
The Speaker A/ B button on the remote control allows
the
two sets
of
speakersto be toggled
on
and
off
. Referto the Remote Control section
of
this manual for more information
on
the Speaker
A/B
operation.
Set either A or
B,
or both Aand B may
be
selected for use.
Note
:
When usingtwo pairs
of
speakers, use speakers with a minimum
nominal impedance
of
8 ohms each.
Speaker A
1-
0 0 •
I Main Room
0 0
~
----
--
----
Amplifier
®
·
Cil·
-
-
•4
~
~
~~
~ 4
~
·
®
~~~~
,~~
·
• .
~
~
4
--
I
-----
-
-1
---
--- -- ----------
-----
--
----
-----··
--
0
1-
0
0+1
0 0
Pre-Out
connections
The Pre-Out sockets are for connecting
to
the input sockets
of
a power
amplifier, or active subwoofer.
The
diagram below shows how to connect
the amplifier to an active subwoofer via either a mono Sub in or Stereo
Line
In
inputs on the subwoofer.
Right
spe
ak
er
Amplifier
urn
0 - 0
-
~-
·@
00
@·
0
1-
0 0
·I
0 0
'
-~"""
I
·-
-
®
ee
-
•ro~
•
ro~
.
-f)
f)
ee
e-e
e
ee
- -
--·
--·
.
·-!---------
0 0
1-
0
o+l
0 0
-.---or---..-
azur
--
~
. " " "
~
ee
e e-
ee
e
e-
. " " "
~
Left
speaker
651A
I
7

8
Cambridge
Audio
Connections cont.
USB
audio connections
The diagram below shows how to connect the amplifier to a personal
computer via
USB
connection. Connect a
USB
'B-A'
type lead from the
651A
USB
inputto one ofthe
USB
ports
on
the
PC.
The 651A
is
USB
1.1 (Full-speed)
USB
port compatible and support
USB
Audio 1.0, which works with nearly all common operating systems
(Windows
XP,
Vista or 7 and Mac
OS
X10.5or higher) and computer types
without drivers and allows
16
bit audio at 32kHz, 44.1kHz and 48kHz to
be
received.
Right
speaker
Amplifier
01
-
0
0
o+
l
0
I
{iJ·
== == ==
~
-
~
~
~
~'
The
651Aalso works with most builds of Linux usingthe native Audio 1.0
driver. Because Linux builds vary according to their creator's choice of
software components including drivers, it
is
not possible to guarantee
operation and Audio drivers may need to
be
loaded.
'Class drivers' as they are called for generic support of Audio Class 1.0
device may be available from the Linux community
as
we
do not supply
these drivers.
·- ·
'li'
-b
='
®
00
-
·~
-
·~-
. .
0
1-
0 0
+I
0 I I
~
-
li§J]
Q:Dm
"
0
"
Le
sp
0
It
eaker
® ·OOO
G·
~·
(jjJ
~e
0
00
00
0
0-
0-0
0
00
00
0
0-
.
--
--.
'------'
Note:
Always
use a certified cable for
USB
Audio preferably one
that
displays
an
official mark.
USB
cable connections longer than
3m
may
result
in
inconsistent audio performance.
8
--
Personal
Computer
~ -
·
~-·
. . " . "
'------'
l
o___:
Always turn the Volume to
minimum,
or turn the
651A
off
before plugging/unplugging cables to the
USB
input
or
whilst booting up your PC/Mac.

Front panel controls
8 Cambridge Audio
azur 651A
azur 651A
Integrated Amplifier
@ ®
Protect io n Speaker
0 0 0
cg
,....,
@ •©
ooOo
Sl ~ ~ M ~
@-©©©©©©
0 ® @ ®
I I
0 Standby/On
Switches the unit between Standby mode (indicated by dim power LED)
and On (indicated by bright power LED). Standby is an eco power mode
where the power consumption is lessthan one watt.The unit is designed
so
that it can be left safely in Standby mode when not in use.
® Phones
Allows for the connection of headphones with a V." jack plug connector.
Headphones with an impedance
of between 32 and 600 ohms are
recommended. When the headphones are connected, the output to the
loudspeakers is switched
off (both speakers Aand B) .
@ Infrared sensor
Receives IR commands from the supplied Azur remote control. A clear,
unobstructed line
of sight between the remote control and the sensor is
required.
@ Protection
LED flashes to indicate activation of CAP5 protection system. Refer tothe
CAP5 section of this manual for more information.
® Speaker LEOs
Indicator shows the speaker terminals that are selected. The speaker
terminals selected are changed with the remote control.
® Direct
This control gives the audio signal a more direct path to the power
amplifier stage
of your amplifier, bypassing the bass and treble control
circuits for the purest possible sound quality.
0 Bass and Treble
These controls allow subtle adjustments to the tonal balance of the
sound.
In the central position these controls have no effect. They only
modify the sound through your loudspeakers and the Pre-Out sockets,
and do not affect the signals sent through the
Rec Out connections.
With well-produced source material and a good system, the tone controls
are unnecessary and can be switched out
by the 'Direct' switch. If the
musical recording is of poor quality or other factors are affecting the
sound quality,
it may be necessary to adjust the tone controls to
compensate.
8 ®
I I
®Volume
Use to increase or decreasethe level of the sound from the outputs of the
amplifier. This control affectsthe level of the loudspeakeroutput, the pre-
amp output and the headphone output. It does not affect the Rec Out
connections. Itis advisable to turn the Volume control fully anti-clockwise
before switchingthe amplifier on.
®Balance
This control allows you to adjustthe relative output levels of the left and
right channels.
In the central position the output from each channel is
equal. This control only modifies the sound through your loudspeakers
and the Pre-Out sockets -it does notaffectthe signals sentthrough the
Rec Out connections.
@ S1/MP3 input
This source input allows you to connect a portable audio device such as
an MP3 player, plugged into either the rear panel 'Sl' Phono/RCA input
pair orthe front panel 3.5mm stereo-jack input (labelled 'MP3
In ').
Press the S1 button on the front panel to select the input, or insert a
device into the front panel socket which automatically selects the input
and overrides the rear PhonojRCA sockets.
Note: Whilst plugging a device into the front panel automatically selects
the MP3 input, any other input can still
be selected once this has been
done.
As a result you may, if desired, leave a device permanently plugged
into the front panel.
@ 52-55 Source inputs
Push the appropriate input selection button to select the source
component
that you wish to listen to. The signal selected is also fed to the
Rec Out sockets so that it may be recorded. The input should not be
changed whilst recording.
@USB
This source input allows connection of a personal computer via USB .
9
I

8
Cambridge
Audio
Remote control
The
651A
is
supplied with
an
Azur
Navigator remote control thatoperates
both this amplifier and Cambridge Audio
Azur
range
CD
players. Insert
the supplied
AAA
batteries to activate.
The
functions relevant to the
amplifier are as follows:
@ Standby/On
Switches the amplifier between
On
and Standby mode.
@Source
Cycles
through the amplifier's source
inputs.
®Mute
Mutesthe audio
on
the amplifier.
The
mute mode is indicated
by
the
source
LED
flashing. Press again to
cancel mute.
Note:
The
speaker outputs, Pre-out
and headphone outputs will all
be muted. The Record outputs are
unaffected.
@ Speaker
A/B
Toggles
the speakerterminals
on
the
rear panel to output speaker A
only,
speaker Bonly, both speakers Aand
B or no speaker output at all.
The
speaker indicators
on
the front panel
ofthe amplifier show which speaker
terminals are selected.
Note: The 'no speaker output' option
allows the 651A to be used as a
preamplifier only.
G8
Volume controls
Increases or decreases the volume
ofthe amplifier output.
888088
' ' '
'
'
The six source select buttons are
used to directly select the input
source to the amplifier.
The
remaining buttons are reserved
for use with Cambridge Audio Azur
CD
players.
0
Open/Close
Opens and closes the disc tray
0
Numerical track select
Press the number of the desired
track.
The
track will then play
automatically from the
start
of
the
track.
8
Track select
To
select a track number greater
than nine,
press-/-
followed
by
the
track number. Playback of the
chosen track starts automatically.
10
808
808
880
888
®®®
808
00@
@@@
800
008
8
Play/
0
Stop/
0
Pause
Press
the relevant button to play, stop or pause the
CD.
88
Skip
Right Skip Press to skip forward
by
one track
on
the
CD.
Left Skip Press to skip backward
by
one track
on
the
CD
.
88
Scan
Press and hold to scan within the selected track. Hold down for seven
seconds to increase scan speed. Press the right button to fast forward,
the left button to rewind.
CD
Info
Used
with
COs
that
support
CO-text.
In
stop mode, press to toggle
between album name and total time
on
the display. During playback,
press to toggle between track name and track time.
@ Bright
Alters the brightness
of
the display backlight. There are three levels of
brightness: Bright, Dim and Off.
8@@@
,
,
,
Read
the 'Operating Instructions' section
of
the Azur
CD
manual for
information
on
the functions ofthese buttons.
Note: these buttons will function only when the display backlight is
in
either 'Bright' or 'Dim' modes.
If
it is set to 'Off', the functions do not
respond.
Apple device compatibility
The Azur 651AC Navigator remote control can control the basic functions
of Apple devices such
as
Apple
TV
and Apple's iPod/iPhone/iPad range
when docked in a Cambridge Audio or Apple dock.
Press and hold the source button that corresponds to the input
that
the
Apple product is connected to whilst also pressing one
of
the buttons
below.
The
functions are slightly different depending
on
the Apple product.
8
Select
0
Play
/pause
0
Stop or Menu
8 8
Press briefly to skip or navigate left or right. Press and hold to
scan forwards or backwards.
G
8
Used
to control volume andjor navigate menus.
©
""''to
""''"'
moo"'
In
addition, the Azur remote can
be
paired with up to six specific Apple
devices usingany
ofthe
six source buttons. This
can
be
useful if
you
have
more than one Apple product.
For
more information
on
pairing refer to your Apple device's instruction
ma.n.uaJ..
Pairing-
To
pair with
an
Apple device, press and hold the required source
button along with the
~
button for six seconds. Some devices like Apple
TV
have visual ind.ication once pairing
is
achieved.
Un-pairing-
To
un
-pair
an
Apple device, press and hold any ofthe source
buttons along with the
~
button for six seconds.

CAPS: Five-way protection system
cambridge Audio has developed a proprietary protection system to
ensure reliability and long life
of
its amplifiers. This protection system
comprises five main protection methods:
1.
DC
detection
·*
Indicator -Unit has switched off during operation, protection
LED
constantly flashes
in
single bursts.
Description -
CAP5
offers loudspeaker protection
if
the output of the
amplifier goesto a
high
constantvoltage
(DC).
This
is
a rare fault, although
detecting
it
could
just
save those expensive loudspeakers.
Remedy -
Due
to the necessary sensitivity of the
DC
protection circuit,
hard
clipping of the amplifier may cause
DC
protection
to
be
triggered.
If
this fault occurs please switch the unit
off
, power up again and check
operation with a reduced volume
level.
If
the
DC
faultoccurs again please
contact your dealer for service.
2.
Over
temperature detection
·*·
"'*
Indicator -Unit has switched off during operation, protection
LED
constantly flashes
in
bursts
of
two.
Description -
CAP5
includes temperature detection which constantly
monitors
the
heat generated
by
the output transistors.
If
the monitored
temperature reaches a high level (suitably within the limits
of
the output
devices)
the
amplifier will automatically switch into a
fault
mode. If the
loudspeaker impedance is
low,
the temperature ofthe amplifier may rise
faster
as
the
amplifier is working harder. If the amplifier is mounted
in
a
cabinet
or
the ventilation slots are obstructed, the over-temperature
detection may activate/reactivate after a short listening
time
.
Remedy-
The unit is not damaged, although
it
should be
left
for
15
minutes to cool down before being switched out ofStandby.
3. Overvoltagejovercurrent detection
"'***
Indicator -Unit has switched
off
during operation, protection
LED
constantly flashes
in
bursts ofthree.
Description -
CAP5
offers Vj l protection
by
constantly monitoring the
output transistors to keep them working inside their Safe Operating
Area
(SOA).
The
SOA
is a
set
of
limits given
by
the
output
transistor
manufacturerto ensure reliability.
VI I
also protects the amplifier against
short-circuits
on
the speaker terminals during
use.
Remedy-
The amplifier is being used outside its performance envelope.
Reduce the volume. Also check to see
if
there
is
a short-
or
partial short-
circuit between the loudspeaker terminals.
Note: Ifthe indication remains the same and multiple loudspeakers are
being used
on
each loudspeaker output, then please remove a pair and
retry. If too many loudspeakers are connected to any amplifier, causing
the load resistance to drop too
low,
the amplifier will
be
overdriven.
CAP5
will detectthis situation. Ifthe indication remains the same with only one
set of loudspeakers connected, there
may
be
a fault with one or both
of
the loudspeakers.
4.
Short-circuit detection
****
Indicator -
As
the unit attempts to come out
of
Standby mode, the
protection
LED
flashes in bursts offour.
Description -During power up from Standby,
CAP5
performs a check
on
the loudspeaker terminals to see
if
a short across the terminals has
been accidentally introduced. If the resistance measured across the
loudspeaker terminals is too
low,
the unit will remain
in
Standby mode
until the fault has been removed and power up is re-attempted.
Remedy -User-related fault. There
may
be
a short-circuit between the
loudspeaker terminals. Check all loudspeaker connections before
attempting
to
switch the unit out ofStandby.
azur
5. Intelligent clipping detection
©
Indicator-
Volume
is
nudged down automatically.
651A
Description -
CAP5
has the ability to detect when the amplifier startsto
clip or overdrive at its output,
wh
i
ch
can damage loudspeakers and
degrade the sound. Clipping distortion is caused at high volume levels
when the output signal briefly goes outside the maximum voltage that
the amplifier can provide, causing the tops of the signal to flatten off.
When
CAP5
detects clipping, the volume will
be
automatically nudged
down until
CAP5
detects
an
undistorted output.
The clipping detection is disabled
by
default. However, to enable the
clipping detection, hold down the Standby/
On
button during power up
(whilst switching
on
the unitatthe rear panel power switch).
The
unit will
indicate this
by
flashing the protection
LED
for several seconds.
Custom installation (C.I.) use
The
651A feature a Control Bus
input;
output
that
allow un-modulated
remote control commands (positive logic,
TTL
level) to be received
electrically
by
the unitand looped to another unit ifdesired. These control
commands are typically generated
by
custom installation (multi-room)
systems or remote
IR
receiver systems. The Control Bus sockets are
colour-coded orange.
An
IR
Emitter Input is also provided that allows modulated
IR
remote
control commands to
be
received electrically
by
the unit. Commands
on
this input operate the unit only and are not looped out demodulated
on
the Control Bus Output.
In
addition the units feature 'direct' IR/Control codes
as
well as toggle
codes for some of
their
features to simplify programming custom
installation systems. Special direct
On
/Off and Mute commands
can
be
accessed
on
the supplied remote control for teaching into
C.
I.
systems
as
follows:
1. Press and hold the Standby button.
The
remote first generates its
standby (toggle) command.
Keep
holdingthe button down and after
12
seconds an amplifier "On" command will be generated.
If
the
button is held down for a further
12
seconds,
an
amplifier "Off"
command is generated.
2. Press and hold the Mute button.
The
remote first generates its
mute (toggle) command. Keep holding the button down and after
12
seconds a "Mute
On
" command will
be
generated.lfthe button is
held down for a further
12
seconds, a "Mute Off" command is
generated.
A full code table for this product is available
on
the Cambridge Audio
website at www.cambridge-audio.com.
11
I

8 Cambridge Audio
Technical specifications
651A
Power output
THO (unwelghted)
Frequency response (-1dB)
S/N ratio (ref 1W)
Input impedances
Power
Amp damping factor
Max. power consumption
Standby power consumption
BassjTreble controls
USB input
Dimensions
(H x W x D)
Weight
12
75 watts (into 8Q)
<0.002% @1kHz, 80%
of rated power
<0 .03% 20Hz- 20kHz, 80% of rated
power
<0.02% 20Hz
-20kHz @10W
5Hz-50kHz
>92dB (unweighted)
47kohms
>100
600W
<1W@ rated mains
Shelving, ultimate boost; cut
+/- 7.5dB@ 20Hz and 20kHz
USB Audio 1.0
16 bit 32kHz, 44.1kHz, 48kHz.
120 x 430 x 350mm
(4.7 X 16.9 X 13 .8")
8.
4kg (18.51bs)
Troubleshooting
There is no power
Ensure the AC power cord is connected securely.
Ensure the plug is fully inserted into the wall socket and is switched on.
Check the
unit is switched on at the rear panel.
Check fuse in
the mains plug or adaptor.
There is no sound
Make sure the unit is not in Standby mode.
Check
that the source component is properly connected.
Check
that your speakers are properly connected.
Check
that the correct speaker outputs are switched on ('Speaker A/B'
button
on the remote control).
If source LED is flashing, turn 'Mute' off .
There is no sound on one channel
Ensure that balance control is in the correct position.
Check speaker connections.
Check interconnects.
There is a loud buzz or hum
Check turntable or tone arm for ground and connection lead fault.
Ensure
no interconnects are loose or defective.
Ensure that your tape deck or turntable is nottoo close to the amplifier.
Unable to make tape recordings
Check that 'Rec Out' has been connected correctly.
There is weak bass or diffused stereo imaging
Ensure that speakers are not wired out of phase.
The sound is distorted
Check that the volume or tone controls are not settoo high.
Protection LED flashing
See section on CAP5 protection system.
The remote handset will not function
Check that the batteries have not expired.
Ensure
that nothing is blocking the remote sensor.
In the event that the above solutions do not remedy your problem, please
consult our frequently asked questions
(FAQ) section on our website:
www.cambridge-audio.
com/sts/faqs
For all servicing, in or out of warranty, please contact your dealer.

Cambridge Audio is a brand
of
Audio Partnership
Pic
Registered Office: Gallery Court, Hankey Place,
London, SE1
488,
United Kingdom
Registered
in
England
No.
2953313
www.cambrldge-audlo.com
©
2011
Cambridge Audio Ltd

Quick
Start
azur
651A/
651C/
651N
How
to
configure
a
basic
system
lnbetriebnahme
fiir
Ungeduldige
Konfigurleren
eines
elnfachen
Systems
D&marrage
rapide
Comment
configurer
un
systeme
simple
Guia
rcipida
Como
configurar
un
sistema
basico
Avvio
rapido
Come
configurare
II
sistema
di
base
Snel
starten
Hoe
u
een
basis
systeem
conflgureert
Kom
hurtigt
i
gang
Sadan
konfigureres
et
almlndellgt
system
&biCTp&A
JCT8HOBK8
K&K
CKOHCi»MrypMpoB&Tb
OCHOBHYIO
K8H&nbHJIO
CMCT8My
8
Cambridge
Audio
Your
music+
our passion

What's
in
the
box?
Lieferumfang
Que
contient
Ia
boite?
Contenido
de
Ia
caja
Cosa
contiene
Ia
confezione?
Wat
u
in
de
doos
zult
vinden
•••
Hvad
er
der
i
kassen?
"'TO
B
KOp06K8?
8
Cambridge
Audio
Your
music+
our passion
azur651A/651C/651N
~~~
@
Q
=

Set-up Einrichtung lnstalaclon Conflgureren
Installation lmpostazlonl Opsaatnlng
1 651A
651C
651N
2
4
•
•
___ _ __ _....,_
-- ---·- ----
~~ ~
~ - ~ ~
@ ~~
• I- I ~ - ~ ~ ~ - ~ I ~~~-
OR/OOER/OU/0 BIEN/
OPPURE/OF/ELLER/~A~
l_
To get the best performance from your azur
651A/651C/651N, please read the manual for more
information.
Urn den vollen Leistungsumfang lhres azur
651A/651C/651N, erschlieSen zu kOnnen, lesen Sie
bitte die weiterfQhrenden lnformationen im Handbueh.
Pour profrter des mellleures performances de votre
azur 651A/651C/651N, veuillez consulter le
manuel
pour obtenlr des Informations.
3
No deje de leer el manual. Contiene toda Ia lnformaci6n necesarla
para obtener el mi!lximo rendimiento de su equipo azur
651A/651C/651N.
Per ottenere le mlgliori prestazloni dal dispositivo azur
651A/651C/651N , leggere attentamente il manuale per le relative
informazioni.
Om de beste prestatles van uw azur
651A/651C/651N te krljgen dlent u de handleldlng te 1ezen voor
meer informatie,
8 Cambridge Audio
Your music+ our passion
azur
(l<l))
WAN~
azur
l.a:!s manualen for at f{j flere oplysninger om, hvordan du ~r det
bedste og meste ud af din azur 651A/651C/651N-enhed .
4To6bl noll~MTb HaMflY'IWMe xapaKTep...cTMKM or Bawero azur
651A/651C/651N OPM 3KalllyaT8LJ1M, llruk8J'lYMCT8,
03H8KOMbTecb C AS.Il~81iiWet'414H$JpM~eM B pyt<OBO,QCT8e.

For
further
information
about
Cambridge Audio, our products, news, reviews and
support, please visit:
Weitere lnfos
zu
Cambridge Audio, unsere Produkte, Neuigkeiten, Testberichte und
Kundendienst finden Sie unter:
Pour obtenir des informations supplementaires
sur
Cambridge Audio, nos produits,
nouveautes, actualites
et
assistance, veuillez vous rendre
sur
notre site :
Para obtener mas informacion acerca de Cambridge Audio, nuestros productos,
noticias, reseiias y soporte, visite:
Per maggiori informazioni su Cambridge Audio e i nostri prodotti, per notizie, articoli
e assistenza, visitare:
Voor meer informatie over Cambridge Audio, onze producten, nieuws, beoordelingen
en
support
(ondersteuning),
kunt
u onze website bezoeken:
Du
kan finde flere oplysninger om Cambridge Audio, vores produkter, nyheder og
support
pa:
6onee
noAp06HyK>
Y!HcpopMa'-'lf1K>
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KOMnaHif11f1
Cambridge Audio, ee
npOAYKTax,
HOBOCTRX,
063opax
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CM.
Ha
896-ca~Te:
www.cambridge-audio.com