Owner's Manual

8
Cambridge
Audio
Contents
Introduction ...................
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Important
safety instructions
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Limited warranty
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Front panel controls ......
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Remote control ..................................
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Apple device compatibility
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Operating instructions
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Filters ...............
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Custom installation
(C.
I.)
use
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14
Troubleshooting ........
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Technical specifications
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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 Audio's 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
Thank
you
for purchasing the Azur 851C Upsampling Compact Disc
Player
I
DAC
I
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
ATF2TM
(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-bitl 44.1kHz from
CD)
to
24bitl384kHz
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 phonoi
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
1
laptop. This can
handle up to
24
-
bitl96kHz
content from most Windows, Mac and Linux
builds.
In
certain circumstances up to 24-bitl 192kHz material can
also be supported.
See
later section
on
Maci PCILinux 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
iPodliPadliPhone
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
ke
ep it for future reference.
Matthew Bramble
Cambridge Audio Technical Director
and the 851C design team