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Contents
Thank you for purchasing the Azur 851C Upsampling Compact Disc
Player / DAC / Digital Preamp. The 8 series range is fundamental to our
commitment to the continual development of the Azur range. We hope
that you will appreciate the results and enjoy many years of listening
pleasure from it. Like all Cambridge Audio products, the 851C adheres
to our three core principles -“ stunning performance, ease of use and
incredible value.
The 851C incorporates numerous advanced technologies and
features. Key to its abilities is ATF2-„¢ (Adaptive Time Filtering) our
second generation up-sampling process - developed in conjunction
with Anagram Technologies of Switzerland. This process intelligently
interpolates all incoming audio data (such as 16-bit/44.1kHz from CD)
to 24bit/384kHz through the use of a 32-bit Analog Devices Black Fin
DSP (Digital Signal Processor). The ATF2 system applies polynomial
curve fitting interpolation, and incorporates a time domain model that
allows data buffering and re-clocking to almost completely eradicate
digital jitter, helping to ensure the best possible sound quality. Our new
ATF2 noise shaping algorithm now also provides enhanced linearity with
24-bit sources.
Two very high quality Analog Devices AD1955 24-bit DACs (Digital to
Analog Converters) are used in dual differential mode. Each channel
has its own DAC to process information and completely separate and
symmetrical analog filter circuitry is implemented. These allow both
left and right channel circuitry to operate identically, ensuring the
851C delivers fantastic sound-staging and stereo imaging properties.
All filtering from DACs to output is also fully differential in nature. This
fully balanced configuration largely rejects the already very low noise
and distortion products present in the DACs and filters and provides
an unprecedented level of performance. Balanced (XLR) outputs are
fitted as well as summed conventional unbalanced phono/RCA outputs.
Automatic DC servo circuits null all DC offsets allowing no capacitors in
the signal path.
For this new model two 24-bit capable digital inputs are fitted allowing
other digital sources to be brought into the 851C.
Also a 24-bit isochronous USB audio interface is provided that enables
the 851C to play audio from a personal computer / laptop. This can
handle up to 24-bit/96kHz content from most Windows, Mac and Linux
builds. In certain circumstances up to 24-bit/192kHz material can
also be supported. See later section on Mac/PC/Linux setups and in
particular our own free Windows driver.
Digital volume and output mute functions are incorporated that enable
the 851C to operate as a combined CD player, DAC and digital pre-
amplifier that can be connected directly to a separate power amplifier
if desired.
In addition to these audiophile features Control Bus Input/Output, IR
Emitter Input and RS232 control are provided to make it easy to integrate
this unit into Custom Installation systems if desired.
A new 8-series casework combines massive structural rigidity with
careful damping and control of acoustic resonance. An Azur Navigator
remote handset is also provided, giving full control of your CD player,
Azur amplifiers and our iD100 digital iPod/iPad/iPhone dock in an
attractive and easy to use handset.
Your 851C can only be as good as the system it is connected to. Please
do not compromise on your amplifier, speakers or cabling. Naturally we
particularly recommend amplification from the Cambridge Audio Azur
range, and in particular the 851A Integrated Amplifier which has been
designed to the same exacting standards as the 851C. 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 A
udio Technical Director
and the 85
1C design team
Introduction
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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 Audios 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 2012
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.
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Introduction ........................................................................\
......................... 2
Important safety instructions
..................................................................... 3
Limited warranty
........................................................................\
.................. 4
Front panel controls
........................................................................\
............ 6
Remote control
........................................................................\
.................... 7
Apple device compatibility
........................................................................\
.. 7
Operating instructions
........................................................................\
........ 8
Filters
........................................................................\
................................ 12
Custom installation (C.I.) use
.................................................................. 14
T
roubleshooting ........................................................................\
................ 14
Technical specifications
........................................................................\
... 15
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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. K
eep these instructions.
3. Heed all w
arnings.
4. F
ollow all instructions.
5. Do no
t use this apparatus near water.
6. Clean only with a dr
y cloth.
7
.
Do
not block any ventilation openings. Install in accordance with the
manufacturers instructions.
8.
Do
not install near any heat sources such as radiators, heat registers,
stoves, or other apparatus (including 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.
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 fit into your outlet, consult an electrician for
replacement of the obsolete outlet.
10.
Pr
otect 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 specified b
y 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.
U
nplug this apparatus during lightning storms or when unused for
long periods of time.
14.
R
efer all servicing to 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
-“
T
o reduce the risk of fire or electric shock, do not expose this unit to
rain or moisture.
-“
Batt
eries (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 (at least 10cm clearance all
round). 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 filled with liquid, such as vases, shall
be placed on the unit.
Important safety instructions
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 products 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.
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
qualified service personnel.
C-Tick mark
This product meets the Australian Communications
Authoritys 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 e
xperienced radio/TV technician for help.
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851C
azur
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