Cambridge Audio Azur-851W Owners Manual
Power Amplier
User’s manual
2
ENGLISH
azur
851W
Your music + our passion
Contents
Introduction
Introduction .................................................................................................2
Important safety instructions .....................................................................3
Limited warranty ..........................................................................................4
Rear panel connections ..............................................................................5
Front panel...................................................................................................6
Connections .................................................................................................7
Unbalanced stereo connections ............................................................7
Balanced stereo connections .................................................................7
Power syncing (On/Standby control) ......................................................8
Advanced connections ............................................................................8
Bi-wired stereo connections ...................................................................8
Bi-amped dual mono connections .........................................................9
Bridged dual mono connections ............................................................9
Powering On/Off the 851W ..................................................................... 10
Custom installation (C.I.) use .................................................................. 10
Conguration menu ................................................................................. 10
CAP5: Five-way protection system ........................................................... 11
Technical specications ........................................................................... 12
Troubleshooting ........................................................................................ 12
Make sure you register your purchase.
Visit: support.cambridgeaudio.com
By registering, you’ll be the rst to
know about:
Future product releases
Software upgrades
News, events and exclusive offers
plus competitions!
Thank you for purchasing this Azur 851W Class XD™ power amplier.
We are condent that you will enjoy many years of listening pleasure
from it. Like all Cambridge Audio products the Azur 851W adhere to
our three core principles – stunning performance, ease of use and
incredible value.
The 851W features our unique proprietary amplier topology; Class XD,
designed to eliminate crossover distortion at low signal levels.
By actively displacing the crossover point this technology creates a region
of pure Class-A operation where the crossover zone would otherwise
be before moving into an enhanced form of Class B at higher levels. It
should not be confused with Class AB, which gives a small area of Class
A, but at the cost of higher distortion as soon as the signal level moves
outside the AB area. Class XD circuitry not only removes crossover
distortion from the zero-crossing point but also joins the characteristics
of the output transistors together in a way that reduces distortion in
other parts of the amplier’s output range.
A white paper on this patented technology is available on our website:
www.cambridge-audio.com
Please note that because of the Class XD technology the 851W runs
slightly warmer than a conventional Class B/AB amplier and the
ventilation slots on the top of the unit must not be obstructed.
Other features include a low resonance acoustically damped chassis
for freedom from distortion inducing vibrations. Four pairs of very
high current output transistors per output are used for excellent load
driving ability, plus the unique fth output transistor pair per channel
that provides the business end of the Class XD circuitry. High quality
polypropylene signal capacitors are used throughout, whilst multiple
copper bus-bars provide very low impedance conduits for the power
circuits and all resistors are 1% tolerance metal-lm types.
Balanced audio input connections are tted for the highest delity and
all inputs have loop outputs. The loop outputs can be used with the
851W’s Bi-Amp Mono and Bridged-Mono modes to allow two or more
851Ws to be used in very high quality systems.
The 851W features separate transformer secondaries for left and right
channels, twin rectiers and separate PSUs for dual mono operation of
the left and right power ampliers.
Your power amplier can only be as good as the system it is connected
to. Please do not compromise on your pre-amplier, source equipment,
speakers or cabling. Naturally we recommend models from the
Cambridge Audio Azur range, particularly the matching 851E preamplier. These have been designed to the same exacting standards as
this amplier. Your dealer can also supply excellent quality Cambridge
Audio interconnects to ensure your system realises its full potential.
Thank you 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 851W design team
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 specications 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 2013.
Cambridge Audio and the Cambridge Audio logo are
trademarks of Cambridge Audio.
Other brands mentioned are trademarks of their respective
owners and are used for reference purposes only.
2
Important safety instructions
For your own safety please read the following important safety
instructions carefully before attempting to connect this unit to the mains
power supply. They will also enable you to get the 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 instructions.
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 ampliers) 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.
A grounding-type plug has two blades and a third grounding prong.
The wide blade or the third prong are provided for your safety. If the
provided plug does not t into your outlet, consult an electrician for
replacement of the obsolete outlet.
10. Protect the power cord from being walked on or pinched, particularly
at plugs, convenience receptacles and the point where they exit from
the apparatus.
11. Only use attachments/accessories specied by the manufacturer.
12. Use with only the cart, stand, tripod, bracket, or
table specied 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 servicing to qualied 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 re 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, re 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 of this unit. Do not situate 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 near water or exposed to dripping or splashing
water or other liquids. No objects lled with liquid, such as vases, shall
be placed on the unit.
851Wazur
ENGLISH
The lightning ash 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
sufcient 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.
WEEE symbol
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.
CE mark
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
qualied service personnel.
C-Tick mark
This product meets the Australian Communications
Authority’s Radio communications and EMC requirements.
Gost-R Mark
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
equipment generates, 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.
If this equipment does cause harmful interference to radio or television
reception, which can be determined by turning the 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 equipment into an outlet on a circuit different from that to
which the receiver is connected.
- Consult the dealer or an experienced radio/TV technician for help.
3
Limited warranty
Ventilation
IMPORTANT – The unit will become hot when in use. Do not stack
multiple units on top of each other. Do not place in an enclosed area
such as a bookcase or in a cabinet without sufcient ventilation.
Do not remove the feet from this product they are required to ensure
enough air ow.
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.
Positioning
Choose the installation location carefully. Avoid placing it in direct
sunlight or close to a source of heat. No naked ame 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 as a 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
other equipment on top of the unit.
Due to stray magnetic elds, 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
<0.5W 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 not overload wall outlets or extension cords as this can result in a risk
of re 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 re hazard.
Be sure to insert each 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
cleaning uids containing alcohol, ammonia or abrasives. Do not spray
an aerosol at or near the unit.
Battery disposal
Batteries may contain substances harmful to the environment. Please
dispose of any discharged batteries with due consideration and in
accordance with local environmental/electronic recycling 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.
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 (at Cambridge Audio’s option) this
product or any defective parts in this product. Warranty periods may vary
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 to ship 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
conrm that you have an unaltered serial number and/or you made a
purchase from a Cambridge Audio authorised dealer.
This Warranty does not cover cosmetic damage or damage due to
acts of God, accident, misuse, abuse, negligence, commercial use, or
modication of, or to any part of, the product. This Warranty does not
cover damage due to improper operation, 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 specic 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.
4
Loading...