Cambridge Audio 851D Digital to Analogue Converter

Cambridge Audio

With a comprehensive range of connections and components, a dual DAC configuration, second generation ATF upsampling to 24-bit/384kHz and three filter options for customised sound, the 851D provides bespoke digital-analogue conversion which uncovers even the tiniest audio detail.


  • The 851D was designed for people who want to store and play their music digitally, without compromising on sound quality. Today's high resolution digital music files allow music lovers to enjoy their music with new levels of detail and drama, and the 851D takes full advantage of such files, converting them into analogue sound with finesse. It will even upgrade the sound of popular music services and compressed mp3 files, using ATF2 upsampling (see below). Click on the video opposite for more detail.

  • The Azur 851D's six digital inputs allow you to connect to many different source components such as smartphone docks, computers, set-top boxes, etc. Whichever source component you connect, dual Analog

    Devices upsampling DACs ensure you hear every drop of detail and drama on offer.
    All stereo sources can be upsampled to 24-bit/384kHz, kept jitter-free by proprietary, second generation ATF

    Adaptive Time Filtering algorithms co-developed with Anagram Technologies of Switzerland.
    The 851Ds chassis combines structural rigidity, careful damping and control of acoustic resonance to ensure uncompormising sound quality even at critical low level gain stages. The result is far improved stereo separation and imaging – unheard of at this price point.

    • DAC: Dual Analog Devices AD1955 24-bit DACs
    • Upsampling: 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.
    • Digital inputs: S/PDIF, TosLink optical, BNC, AES/EBU, BT100 Bluetooth
    • USB audio input
      USB Type B conforming to Audio profile 1.0 or USB Audio profile 2.0 (user selectable) 1.0 or USB Audio profile 2.0 (user selectable)
    • Analogue audio outputs
    • Balanced XLR and unbalanced RCA analogue audio outputs.
    • 1 ¼" / 6.35mm headphone output (supports 600 Ohm headphones, however 300 Ohms max recommended)
    • Sample rates supported
      USB Audio 1.0 16-24 bit, 32-96kHz
      USB Audio 2.0 16-24 bit, 32-192kHz
      TosLink 16-24 bit, 32-96kHz
      S/PDIF 16-24 bit, 32-192kHz
      BNC 16-24 bit, 32-192kHz
      AES/EBU 16-24 bit, 32-192kHz
    • BT100 Bluetooth receiver: A2DP plus aptX
    • Maximum power consumption: 40W
    • Colour: Black or silver
    • Dimensions (HxWxD): 115 x 430 x 360mm (4.5 x 16.9 x 14.7”)
    • Weight: 7.5kg (16.5lbs)