The ultimate amplifier combination

The ultimate amplifier combination
Azur 851E and 851W
Pre and Power amplifiers
Azur 851E and 851W
Pre and Power amplifiers
Top reasons to buy the Azur 851E and 851W
This pre and power amplifier combination delivers exceptional quality audio. Here are 10
reasons to choose the Cambridge Audio Azur 851E and 851W over other systems…
1
Immense power. Into 8 Ohms, the 851W outputs
200W per channel in stereo mode. Into 4 Ohms,
this figure increases to 350W per channel! In
bridged mono mode into 8 Ohms the 851W is a
500W monoblock amplifier. Into 4 Ohms, this figure increases
to an incredible 800W!
2
Class XD amplification. The 851W runs our
proprietary Class XD amplification. This combines
the best of Class A and Class AB amplification,
delivering the sound quality of a Class A amp while
retaining the efficiency of a Class AB amp.
3
Incredibly low distortion. Every component within
the 851E is designed not to interfere with the audio
signal input and output, meaning that harmonic
distortion and noise are so low that they’re almost
impossible to measure.
4
Further improvements. The 851E features a highend-friendly range of inputs and an innovative solid
state volume control – this retains audio signal
purity and precision even at low volume levels.
5
Terrapin modules. Both the 851E and 851W
use our proprietary Terrapin impedance buffering
modules, for absolutely consistent sound across all
sources.
6
7
Superior connectivity. The 851E has a wider
range of input options than its predecessors, with
eight inputs including three switchable between
unbalanced RCA and balanced XLR – the latter ideal
for connecting to modern high-end sources.
8
9
10
CAP 5 protection. protects the 851W, plus any
connected equipment and speakers, ensuring
ultimate reliability and peace of mind.
Private listening. The 851E’s headphone output
will deliver high quality sound too; great when not
wanting to disturb others.
Full Metal Jacket: all the above points would
mean nothing if these amplifiers were not built to
last! From the all-metal casework and ultra rigid
chassis, to the high-quality, high-power toroidal
transformers, every component in the 851E and 851W is
designed to give many years of listening pleasure.
Did you know?
Vital statistics:
851W
Power output (stereo):
200W per channel into 8 Ohms
350W per channel into 4 Ohms
Power output (mono):
500W into 8 Ohms
800W into 4 Ohms
Dimensions: 148 x 430 x 365mm (5.8 x 16.9 x 14.4”)
Weight:
19.1kg (42.2lbs)
851E
Inputs:
3 x Balanced XLR
8 x Unbalanced RCA
Outputs:
1 x Balanced XLR Pre Out
1 x Unbalanced RCA Pre Out
1 x subwoofer output
Dimensions: 115 x 430 x 385mm (4.5 x 16.9 x 15.2’’)
Weight:
8.1kg (17.9lbs)
Top-Tip
s
Toroidal transformers. The 851E and 851W both
uses a large toroidal transformer to deliver perfect
power, with extremely low distortion. The 851W
takes things one step further by using two separate
toroidal transformers; one for the power amplifier itself and
one for input and other circuitry.
The 851W is so powerful that a normal mains cable can’t
deliver the current required. We supply the 851W with its
own dedicated, high performance 20 Amp mains cable!
The ultimate amplifier combination
When we set about developing our Azur 851 Series of hi-fi
separates, the brief was simple: to make a hi-fi system that
sounds better than anything else out there. The award-winning
851 series is designed with one goal in mind – perfection. With
this in mind, the Azur 851E and 851W are the ultimate pre and
power amplifier combination.
By separating out pre and power amplifier functionality, our
engineers were able to give each component the time and
dedication that it needs to deliver the ultimate performance.
The 851E pre-amplifier is an analogue pre-amp that is so
accurate, it’s almost impossible to detect audio distortion. In
fact, with every component designed not to interfere with the
The inside story
Helping us to achieve this incredible sound are some other key
features rarely seen at this price point.
• Immense power. Into 8 Ohms, the 851W outputs 200W per channel in
stereo mode. Into 4 Ohms, this figure increases to 350W per channel!
• Flexible configuration. The 851W can be used in stereo, bi-amped
or bridged mono configurations. In bridged mono mode into 8 Ohms
the 851W is a 500W monoblock amplifier. Into 4 Ohms, this figure
increases to an incredible 800W!
Hot Tip!
User friendly display:
Features such as changing
input names on the display
allow you to customise the
851E to suit your system,
making it simple to select
and listen to sources.
Cambridge Audio’s policy of continuous improvement means design and specification may change without notice. All rights reserved © 2013 Cambridge Audio. Cambridge Audio is a brand
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www.cambridge-audio.com
audio signal input and output, harmonic distortion and noise are
so low that they’re almost impossible to measure.
The 851W power amplifier is our best ever sounding
amplifier. Key to this is a refined version of our proprietary
Class XD amplification. This combines the best of Class A and
Class AB amplification, delivering the sound quality of a Class A
amp while retaining the efficiency of a Class AB amp.
The 851E and W are, of course, designed to work in perfect
synergy with each other – from the fully balanced XLR audio
connectivity, to neat touches such as power syncing with each
other - this pre and power amplifier combination not only sounds
incredible, but works in perfect harmony too.
• Class XD amplification. The 851W runs our proprietary Class
XD amplification. This combines the best of Class A and Class AB
amplification, delivering the sound quality of a Class A amp while
retaining the efficiency of a Class AB amp.
• Incredibly low distortion. Within the 851E, every component is
designed not to interfere with the audio signal input and output, meaning
that harmonic distortion and noise are so low that they’re almost
impossible to measure.
• Further improvements. The 851E also improves over its predecessor,
the highly rated 840E, with a more versatile and high-end-friendly range
of inputs and an innovative solid state volume control – this retains
audio signal purity and precision even at low volume levels.
• Terrapin modules. Both the 851E and 851W use our proprietary
Terrapin impedance buffering modules, for absolutely consistent sound
across all sources.
• Toroidal transformers. The 851E and 851W both use a large toroidal
transformer to deliver perfect power, with extremely low distortion. The
851W takes things one step further by using two separate toroidal
transformers; one for the power amplifier itself and one for input and
other circuitry, for a performance unaffected by audio output volume or
dynamics.
Did you know?
The 851E is supplied with our new system remote,
allowing you to control the amp, CD, DAC and streamer,
all from the same remote.
www.cambridge-audio.com
Azur 851E and 851W
Pre and Power amplifiers
Toroidal vs EI transformers
We strive for audio perfection which is why both the 851E
and 851W feature powerful toroidal transformers. The 851W
takes things one step further by using two separate toroidal
transformers; one for the power amplifier itself and one for input
and other circuitry!
Cambridge Audio was one of the first manufacturers to use
toroidal transformers in the 1970s, and we continue to use
them today. Some of the benefits of a toroidal transformer,
over the cheaper, inferior EI transformers used by most other
manufacturers are:
RS232 control
for custom installation
integration
Dedicated
subwoofer output
Flexible configuration
Balanced (XLR)
audio inputs
The 851W can be used in stereo, bi-amped or bridged mono
configurations. In bridged mono mode into 8 Ohms the 851W is a
500W monoblock amplifier. Into 4 Ohms, this figure increases to
an incredible 800W!
Unbalanced
(RCA) audio
inputs
Trigger input
& output
Stereo
851E
200W
Bi-Amped
igh quality power output to the amplification circuits, with no
H
clipping of the waveform signal, to provide a consistent signal
No transformer noise, buzz or hum
Sensational bass performance
851E
Right speaker
outputs
200W
200W
Left speaker
outputs
High power output, to allow large and demanding speakers to
be driven at high volumes
Large power reserves, to allow the transformer to deliver high
peaks of volume when required
F ully shielded against internal and external electrical
interference, to maintain quality of power and signal
A typical cheaper El
transformer:
Weak inconsistent signal
No shielding
‘Terrapin’ impedance buffering
modules
Cambridge Audio’s proprietary Terrapin modules are used exclusively
in the 851E and 851W. When designing a stereo system, listeners
are often encouraged to think about system matching, where
components are handpicked to provide the best overall sound
quality. People often assume this is due to the different audio
characteristics, but frequently it is due to impedance (the relationship
between voltage and current input/output) matching components.
Products perform at their optimum when their input and output
impedances match, or the products’ audio circuits are decoupled
from other connected equipment. By using Terrapin impedance
buffering modules, we have minimised the effects of different
components’ impedances. This creates a system that can be paired
with a far wider variety of audio sources, without risking any sacrifice
in musicality or performance.
851W
851W
200W
200W
Bridged Mono
851E
500W
Biamp/stereo/
mono selector
851W
851W
500W
Superior connectivity
Balanced (XLR)
audio input
20 Amp
mains socket
The 851E has a wider range of input options than its predecessors,
with eight inputs including three switchable between unbalanced
RCA and balanced XLR – the latter ideal for connecting to modern
high-end sources. Plus flexible and configurable trigger and IR
outputs, and control bus options make it easy to connect to modern
power amps such as the 851W for power syncing.
Unbalanced (RCA)
audio input
Noisy
Won’t drive powerful and
demanding speakers
200W
851W
Class XD amplification
The two most common forms of amplification in hi-fi stereo amplifiers
are ‘Class A’ and ‘Class AB’.
Class A is typically used in extremely expensive amplifiers because
it produces phenomenal sound quality. However, it’s also very
inefficient, generating substantial heat which needs to be managed –
normally with many expensive heat sinks.
Class AB is more commonly used because it is far more efficient.
However, this doesn’t deliver quite the same sound quality as Class
A because it generates distortion at the crossover point in high level
frequencies, which is audible.
Not satisfied with either of these options, our engineers developed
our patented Class XD amplification which adds voltage to a
traditional Class AB design to shift the crossover point to a position
where the audio distortion is not audible to the human ear.
Class XD therefore combines the the sound quality of a Class A
amp with the efficiency of a Class AB amp, and also means that
customers’ money is spent on further premium hi-fi components and
technologies for great sound, rather than dealing with heat.
Did you know?
The 851E features a solid state volume control. While the
volume control itself is digital, the signal remains completely
analogue. This innovative, solid state solution delivers
absolutely precise and linear control and retains channel
balance perfectly at low levels while ensuring the audio signal
is left untouched.
CAP5 (Cambridge Audio Protection 5)
protects the 851W, plus any connected equipment and speakers,
ensuring ultimate reliability and peace of mind.
• Over current – protects speakers from being driven too hard
• Temperature protection – in case of inadequate ventilation
• DC Detect – protects against the most common user errors in
set-up
• Short circuits – to detect incorrectly connected speakers
Designer’s note
“Our Class XD amplification is designed to
deliver the best of Class A and AB in one.
Power efficiency without crossover distortion –
the result sounds simply stunning.”
[Chris, Electronic Design]
• Clipping – prevents damage if the 851W is driven too hard
All metal design
Electronics (and therefore sound quality) are particularly susceptible
to vibration; that’s why we’ve used a low resonance, acousticallydampened metal chassis to eliminate as much vibration as
possible, ensuring that the most sound quality is extracted from
each source.
www.cambridge-audio.com
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