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CAMBRIDGE AUDIO - Azur 851W Power Amp

Power Amp

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Cambridge Audio Azur 851W Power Amplifier

Enormous Power: Azur 851W Delivers 200WPC into 8 Ohms in Stereo or Whopping 500WPC in Bridged Mono Configuration

Proprietary Class XD Amplification and Separate High-End Toroidal Transformers Anchor Azur 851W, Make it Best-Sounding Power Amp in Cambridge Audio's Renowned History

Power. And plenty of it. It's what first comes to mind when discussing Cambridge Audio's flagship Azur 851W, a sublimely accurate two-channel power amplifier that takes command while flawlessly driving your speakers and produces transparent, engaging, and excitingly dynamic sound. Azur 851W offers a massive 200WPC into 8 ohms in stereo configuration and a head-spinning 500WPC when run in bridged mono configuration. No matter whether you use one or a pair, Azur 851W impresses with knockout sound that is hands-down the finest to ever come out of a Cambridge Audio product. And that's no small praise.

Azur 851W is based around Cambridge Audio's innovative and proprietary Class XD system, with 12 output transistors per channel. Combining the best of Class A and Class AB and removing the downsides of both, Class XD eliminates crossover distortion like a Class A amp while offering the power efficiency of Class AB. This superb component also uses separate high-end toroidal transformers: one for the power amplifier itself and one for input and other circuitry for performance unaffected by audio output volume or dynamics. Proprietary Terrapin impedance buffering modules separate amplifier and signal impedance for consistent sound across sources. And Cambridge Audio's CAP5 protection prevents against DC spikes, overheating, short circuits, and clipping.

To complement the outstanding increases in stereo separation and imaging rendered by the Terrapin modules, an all-metal chassis provides massive structural rigidity, damping elements, and acoustic-resonance control. Inside and out, Azur 851W is built to serve for decades to come, and to give you musical pleasures you never before experienced in your home. Backed by our 30-Day Money-Back Guarantee, Azur 851W will change the way you hear and feel sound.

More on Class XD Amplification
Cambridge Audio's proprietary amplification system switches dynamically between Class A and AB systems. Class A amplification delivers the purest possible sound, using only one transistor to conduct, but can be energy inefficient. Class AB involves both transistors conducting simultaneously, but makes it impossible to maintain a balance of low crossover distortion and power efficiency. The Class XD system operates in both Class A and Class AB mode, dynamically moving the crossover point depending on the audio output volume. This combines the near zero crossover distortion of pure Class A with improved efficiency of Class AB at higher volumes, without any compromises in performance for the best of both worlds.

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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 impedance:
    Balanced input: 38 kOhm
    Unbalanced input: 68 kOhm
Power Amp damping factor: > 110 at 1 kHz
Power consumption:
    Max: 2400W
    Standby: <0.5W
Dimensions (HWD): 5.8" x 16.9" x 14.4"
Weight: 42.2 lbs.

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User Manual (PDF, 9.7 MB)

Brochure (PDF, 604 KB)

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