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The Cambridge Audio Azur 851W is a Class XD amplification, 200 Watts per channel, flexible configuration, the 851W Power Amplifier is the Cambridge finest power amp yet.

Take the best and make it better. The result is the 851W, our flagship power amp, which features immense power with incredibly low distortion. It's flexible too, as it can be used in stereo, bi-amped or bridged mono configurations, and paired with the 851E pre-amp, or any of our digital pre-amps.

The attention to detail is such that the 851W comes with its own high performance 20-amp power lead, while CAP5 circuitry protects it and other components in your hi-fi set up. The result is effortless control over any speaker, letting you re-discover your favourite music.


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.

The 851W uses our proprietary Terrapin impedance buffering module, for absolutely consistent sound across all sources.

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.

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


  • Power output/stereo/mono: 200W per channel into 8 Ohms, 350W per channel into 4 Ohms
  • Power output - bridged mono: 500W 8 Ohms, 800W 4 Ohms
  • THD (unweighted): < 0.001% 1 kHz, < 0.005% 20 Hz - 20 kHz
  • Frequency response: 5Hz - 80kHz
  • S/N ratio (ref 1W / 8 Ohn): >90dB (unweighted)
  • Sensitivity - stereo or mono: 1.5V rms unbalanced, 1.5 + 1.5V rms balanced
  • Sensitivity - bridged mono: 0.775V rms unbalanced, 0.775V + 0.775V rms balanced
  • Input impedances: Balanced input 38 kOhm, Unbalanced input 68 kOhm
  • Power amp damping factor: > 110 at 1 kHz
  • Max. power consumption: 2400W
  • Standby power consumption: Standby <0.5W
  • Colour: Black or silver
  • Dimensions (HxWxD): 148 x 430 x 365mm (5.8 x 16.9 x 14.4")
  • Weight: 19.1kg (42.2lbs)
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