Cambridge Audio Azur 851C DAC,CD Player & Preamplifier

Category: CD Players, DAC / Music Streamer, 

Product Code: 851C

Availability: Low


Cambridge Audios finest CD player and DAC, the 851C uses our extensive digital knowledge to become the cornerstone of your digital hub. No matter the source of your digital music, twin DACs in dual differential mode and 2nd generation Adaptive Time Filtering make the music sound as the original artist intended – extraordinary.
The 851C uses audiophile grade components throughout and incorporates our most advanced technologies to ensure it plays music perfectly. Your discs are spun on our own audio-only transport and coupled with our S3 servo to give error-free data retrieval and jitter minimisation. Our ultra-rigid metal construction also ensures components are isolated and free from vibration.
The 851C isn’t just built for playback of CDs; we wanted to make the most of its ATF upsampling and superb DACs, so it’s a complete digital hub which can connect to almost anything digital. It’s got optical and co-axial digital in and outputs plus an asynchronous USB audio input. So you can connect up TVs, streamers, PCs, MACs and more, and everything will be upsampled to amazing hi-res quality.


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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 1
S/PDIF 75 Ohms or TosLink optical
Digital input 2
S/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
USB 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 output
2.2Vrms (2.2Vrms each phase for the balanced output)
Max. power consumption
Idle consumption
Standby power consumption
Black or silver
Dimensions (WxHxD)
430 x 115 x 360mm (16.9 x 4.5 x 14.7”)
10.0Kg (22lbs)