Cambridge Audio Azur 851A Integrated Class XD Amplifier

Cambridge Audio

Out of stock

Like all Cambridge Audio products, the 851A adheres to our three core values: stunning performance, ease of use and incredible value.
  • Dimensions : 430 x 115 x 385mm
  • Weight: 15.0Kg (33lbs)
  • RS232 controllable
  • Available black and silver finishes
  • Frequency : 10 Hz – 50 kHz +/- 1 dB


Out of stock

Capable of delivering an enormous 120 watts of high-quality power, it benefits from two audiophile-grade?toroidal transformers: one for the sensitive preamp section and one for the power stages allowing the 851A to deliver its immense output without stress. This incredible speaker-taming amount of power can be precision-controlled with another innovation found in the 851A – the new fully balanced silicon gate volume control, which gives very fine adjustment across the volume range and highly accurate channel-balancing.

Because everyone’s needs are different, the 851A offers two main types of connectivity: the more commonly found RCA/Phono inputs, plus two pairs of fully balanced XLR connections. Our matching 851C upsampling CD player also features both types of connection, allowing you to connect your system in the very highest quality possible.

Speaking of flexibility, you can even control your iPhone, iPad or iPod using the 851 Series remote control when they’re docked in our matching iD100 digital dock.

Unlike many high end amplifiers which excel in one area over another, we believe the 851A offers the perfect combination of high performance, flexibility and ease of use. It’s designed to take your listening experience to an entirely different level and we invite you to audition our best amplifier to date at your nearest Cambridge Audio specialist.


  • Class XD amplification designed to eliminate crossover distortion at low signal levels
  • New balanced volume topology controllable in 1dB steps, giving very fine control, and superbly accurate channel balance
  • Audiophile grade oversize toroidal transformer and substantial extruded heat sink allowing 2 x 120 Watts RMS into 8 Ohms or 2 x 200W into 4 ohms.
  • Separate transformer taps for left and right channels, twin rectifiers and separate PSUs for the dual mono operation of the left and right power amplifiers
  • A separate toroidal transformer supplies the preamp making the 851A effectively a Pre and Power amp combination in one box
  • CAP5 protection technology for trouble-free operation
  • Acoustically damped full metal chassis with thick brushed aluminium front panel
  • Customizable front panel display
  • Balanced and unbalanced analog audio inputs for superior connectivity
  • RS232 controllable
  • Eco-friendly <0.5W Standby power consumption
  • Available in black and silver finishes
SKU: 851A Category:
Weight 15000 g
Dimensions 385 × 430 × 115 mm

  • Power output
    120W RMS into 8 Ohms
    200W RMS into 4 Ohms
    200W RMS into 4 Ohms
  • THD (unweighted)
    < 0.001% 1 kHz at 80% of rated power
    < 0.01% 20 Hz – 20 kHz at 80% of rated power
  • Audio inputs
    2 x balanced XLR
    8 x RCA inputs
  • Audio outputs
    Preamp output
    Record output
  • Frequency response: 10 Hz – 50 kHz +/- 1 dB
  • S/N ratio: > 93 dB (ref 1W/8 Ohm)
  • Input impedances
    Inputs 1 and 2 (balanced): 20 kOhm
    Inputs 1-7 unbalanced: 20 kOhm
    Rec Input: 20 kOhm
  • Power Amp damping factor: > 110 at 1 kHz
  • Max. power consumption: 800W
  • Minimum power consumption: Active (no signal) 70W
  • Standby power consumption: Standby <0.5W
  • Bass/treble controls
    Shelving type
    Max bass boost/cut: +/- 10 dB at 10 Hz
    Max treble boost/cut: +/- 7.5 dB at 20 kHz
  • Dimensions (W x H x D): 430 x 115 x 385mm (16.9 x 4.5 x 15.2”)

Weight: 15.0Kg (33lbs)