Cambridge Audio

Azur 851W Power Amplifier

Delivering immense power and incredibly low distortion, the 851W power amplifier is perfectly matched to partner our 851E pre-amplifier and 851N network player; taking their pure signal and amplifying it with huge presence and authority.
Learn More
Join The Waitlist!
Bread Checkout

Class XD
Rather than use a Class A design, which is sonically brilliant but generates vast amounts of heat, or a Class AB design, which is efficient but sonically limited, Cambridge developed their own Class XD amplifier design which the 851W takes advantage of. This has the sonic purity of Class A and the efficiency of Class AB for the best of both worlds.

Terrapin Buffering
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. This isn't always possible though so Cambridge decided to develop their unique Terrapin impedance buffering module. This enables the 851W to be paired with a huge variety of audio sources and pre-amplifiers of varying impedance without risking any sacrifice in musicality or overall audio performance.

Power and Control
To build the 851W to be the best, toroidal transformers were essential. But rather than use one for everything Cambridge designated one for the sound amplification itself, and another for the input circuitry. This means the signal is unaffected by audio output volume, so always sounds fantastic. The primary toroidal transformer provides unrestricted power to the dual mono amplification blocks. It's a true audiophile transformer that will operate without distortion and with no buzz, interference or hum. The second smaller toroidal transformer takes care of pre-amplification processes.

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. It can be paired with our 851E pre-amp, any of our digital pre-amps such as the 851N or CXN, or any other analogue pre-amps, and thanks to their Terrapin buffering module it will always sound perfectly matched.

Cap 5 Protection
Their proprietary CAP 5 protection system protects the 851W, plus any connected equipment and speakers, ensuring ultimate reliability and peace of mind.

More Information
Power Per Channel350W / 200W (4 Ohms / 8 Ohms)
Number of Channels2
THD Stereo< 0.001% @ 1 kHz; < 0.005% @ 20 Hz - 20 kHz
Signal To Noise Ratio90 dB
Inputs2 Balanced XLR, 2 Unbalanced RCA, 1 Relay Trigger (3.5-mm Mono Jack), 1 IR Emitter (3.5-mm Mono Jack)
Number of Outputs2 Pairs Speaker Binding Posts Per Channel (4 Total), 2 Balanced XLR, 2 Unbalanced RCA, 1 Relay Trigger (3.5-mm Mono Jack)
Max Power Consumption2400W
Power RequirementsAC 120 V, 60 Hz
FeaturesBalanced Inputs, Bi-Wire Output, Stereo, 12v Trigger
Warranty3 Years
Write Your Own Review
You're reviewing:Cambridge Audio Azur 851W Power Amplifier
Your Rating
Copyright © 2020 Audio Advice. All rights reserved.