Cambridge Audio Azur 851C Flagship Upsampling DAC, CD Player & Preamplifier

Cambridge Audio

The Cambridge Audio 851C uses extensive digital knowledge to become the cornerstone of your digital hub. No matter the source of your digital music. 

Music is more widely available and enjoyed more than ever before, with access to endless content via computers and the internet. The 851C has been built without compromise to provide a single hub from which digital music can be enjoyed in the best possible quality. 


Type: CD Player


Technical specifications

  • Digital to analogue converters Dual Analog Devices AD1955 24-bit DACs
  • Digital filter Analog Devices Black Fin ADSP-BF532 32 bit DSP performing 2nd Generation ATF2 upsampling to 24-bit/384kHz. Linear Phase, Minimum phase or Steep modes.
  • Analogue filter 2 Pole Fully Differential Linear Phase Bessel filter
  • Digital input 1S/PDIF 75 Ohms or TosLink optical
  • Digital input 2S/PDIF 75 Ohms or TosLink optical
  • AES/EBU input XLR balanced 110 Ohms per phase
  • USB audio input USB Type B conforming to Audio profile 1.0 or 2.0 (user selectable)
  • Audio outputs Balanced XLR and unbalanced RCA analogue audio outputs
  • CompatibilityUSB 1.0 16-24 bit, 32-96kHz 
    USB 2.0 16-24 bit, 32-192kHz 
    TosLink 16-24 bit, 32-96kHz 
    S/PDIF and AES/EBU 16-24 bits 32-192kHz 
    CD playback is intrinsically limited to 16-bits 44.1kHz
  • THD (unweighted) @ 1kHhz 0dBFs< 0.0004%
  • THD (unweighted) @ 1kHz -10dBFs< 0.0004%
  • THD (unweighted) @ 20kHz 0dBFs< 0.0007%
  • IMD (19/20kHz) 0dBFs< 0.0002%
  • Linearity @ -90dBFs+/- 0.2dB
  • Linearity @ -120dBF+/- 0.4dB
  • Stop-band rejection (>24kHz)> 120dB
  • S/N ratio (ref 1w)> 113dB
  • Total correlated jitter< 60pS for all digital inputs, CD playback and USB 2.0 
    < 180pS for USB 1.0
  • Crosstalk @1kHz< -130dB
  • Crosstalk @20 kHz< -114dB
  • Output impedance< 50 Ohms
  • 0dB Fs output2.2Vrms (2.2Vrms each phase for the balanced output)
  • Max power consumption 40W
  • Idle consumption 8W
  • Standby power consumption <0.5W
  • Colour Black or silver
  • Dimensions (WxHxD) 430 x 115 x 360mm (16.9 x 4.5 x 14.7”)
  • Weight 10.0Kg (22lbs)
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