Cambridge Audio Azur 851A Integrated Amplifier

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  • Our flagship integrated amplifier includes 120 watts per channel of Class XD amplification, twin toroidal transformers, and an acoustically damped full metal chassis. All of which helps to bring you pure, clean and powerful sound with outstanding musical detail.


    As Ben explains in the video opposite, the 851A uses a range of high-end components to amplify your sound while achieving the uncompromising level of sound quality we demand from all of our products. 

    Left and right channels are processed using separate circuitry and transformers, meaning you can effectively enjoy the sonic benefits of twin mono amplifiers from one unit! 



    Class XD is our a proprietary amplifier circuit design which offers superior sound quality currently available from existing amplifier configurations, whilst retaining the high power levels required for truly dynamic performance.

    Class XD (crossover displacement), gives the benefits of pure Class A operation at low levels and eliminates the distortion associated with conventional Class B operation as the fragile audio signal passes though the zero crossing point from transistor to transistor. The result is a smooth and linear transition between the two key operating modes, Class A and B.

    The benefits of this approach give the sonic refinements of Class A operation and the uncompromising efficiency and power of Class B operation. In fact, the 851A delivers a gigantic 120 watts per channel - enough for the most demanding speaker set-up.


    You can control the amplifier from your iPhone, iPad or iPod by simply docking them in our iD100 digital dock. To suit your unique needs the 851A amplifier offers two main types of connectivity, namely RCA/Phono inputs and two pairs of fully balanced XLR connections.


    Our 851A amplifier makes use of high-end technology such as audiophile-grade toroidal transformers to bring you the best sounding music. Toroidal transformers are electronic components which serve as inductors. The 851A amplifier uses two of these: one for the preamp section and another for the power stages. This means that the speaker output can be precision-controlled, bringing you a higher volume range and accurate channel balancing. The acoustically damped full metal chassis with thick brushed aluminium front panel also provides enhanced resonance control.


    • Proprietary Class XD amplification design
    • 2 x 120 watts RMS into 8 ohms, 200 watts into 4 ohms – able to drive almost any type of premium speakers
    • Audiophile grade oversize toroidal transformers for lower noise and quieter PSU operation
    • Fully balanced silicon gate volume control for very accurate volume control and channel balance
    • 2 sets of XLR balanced audio inputs allowing connection of more than one high-end device, such as 851C and DacMagic Plus
    • Connections: sources labeled 1 through 7, plus record-in and record-out (labeled 'In8/Tape' on the remote); two of those source inputs can be either balanced or RCA, the other six are RCA
    • Bas and Treble controls
    • Direct mode
    • Fully upgraded CAP5 protection system
    • RS232 control allowing integration into Custom Installation (CI) systems
    • Acoustically damped full metal chassis and brushed aluminum front panel
    • New reverse black DFSTN (Double Film Super Twisted Nematic) display – with nameable inputs for ultimate flexibility
    • Two speaker terminals for bi-wiring or to drive a second pair of speakers in another location
    • New satin black 851 Series remote – also controls iPhones / iPads docked in Cambridge Audio's iD100 dock
    • 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 
    • Frequency response: 10 Hz - 50 kHz +/- 1 dB S/N ratio (ref 1W/8 Ohm): > 93 dB 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: 16.9" wide, 4.5" high, 15.2" deep 
    • Weight: 33 lbs

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