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Contents

For your own safety please read the following important safety 

instructions carefully before attempting to connect this unit to the mains 

power supply. They will also enable you to get the best performance from 

and prolong the life of the unit:
  1.  Read these instructions.
  2.  Keep these instructions.
  3.  Heed all warnings.
  4.  Follow all instructions.
  5.  Do not use this apparatus near water.
  6.  Clean only with a dry cloth.
  7.  Do not block any ventilation openings. Install in accordance with the 

manufacturer's instructions.

  8.  Do not install near any heat sources such as radiators, heat registers, 

stoves, or other apparatus (including other amplifiers) that produce 

heat.

  9.  Do not defeat the safety purpose of the polarized or grounding-type 

plug. A polarized plug has two blades with one wider than the other.  

A grounding-type plug has two blades and a third grounding prong.  

The wide blade or the third prong are provided for your safety. If the 

provided plug does not fit into your outlet, consult an electrician for 

replacement of the obsolete outlet.

10.  Protect the power cord from being walked on or pinched, particularly 

at plugs, convenience receptacles and the point where they exit from 

the apparatus.

11.  Only use attachments/accessories specified by the manufacturer.
12.  Use with only the cart, stand, tripod, bracket, or 

table  specified  by  the  manufacturer,  or  sold  with  the 

apparatus. When a cart is used, use caution when 

moving the cart/ apparatus combination to avoid injury 

from tip-over.

13.  Unplug this apparatus during lightning storms or when unused for 

long periods of time.

14.  Refer  all  servicing  to  qualified  service  personnel.  Servicing  is 

required when the apparatus has been damaged in any way, such 

as the power-supply cord or plug having been damaged, liquid has 

been spilled or objects have fallen into the apparatus, the apparatus 

has been exposed to rain or moisture, does not operate normally, or 

has been dropped.

WARNING 
–  To reduce the risk of fire or electric shock, do not expose this unit to 

rain or moisture.

–  Batteries (battery pack or batteries installed) shall not be exposed to 

excessive heat such as sunshine, fire or the like.

The unit is of Class 1 construction and must be connected to a mains 

socket outlet with a protective earthing connection.
The unit must be installed in a manner that makes disconnection of 

the mains plug from the mains socket outlet (or appliance connector 

from the rear of the unit) possible. Where the mains plug is used as the 

disconnect device, the disconnect device shall remain readily operable. 

Only use the mains cord supplied with this unit.
Please ensure there is ample ventilation. We recommend that you do 

not place the unit in an enclosed space; if you wish to place the unit on 

a shelf, use the top shelf to allow maximum ventilation. Do not put any 

objects on top of this unit. Do not situate it on a rug or other soft surface 

and do not obstruct any air inlets or outlet grilles. Do not cover the 

ventilation grilles with items such as newspapers, tablecloths, curtains, 

etc.
This unit must not be used near water or exposed to dripping or splashing 

water or other liquids. No objects filled with liquid, such as vases, shall 

be placed on the unit.

Important safety instructions

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This guide is designed to make installing and using this 

product as easy as possible. Information in this document has 

been carefully checked for accuracy at the time of printing; 

however, Cambridge Audio's policy is one of continuous 

improvement,  therefore  design  and  specifications  are 

subject to change without prior notice.
This document contains proprietary information protected 

by copyright. All rights are reserved. No part of this manual 

may be reproduced by any mechanical, electronic or other 

means, in any form, without prior written permission of the 

manufacturer. All trademarks and registered trademarks are 

the property of their respective owners.
© Copyright Cambridge Audio Ltd 2013.
Cambridge Audio and the Cambridge Audio logo are 

trademarks of Cambridge Audio.
Other brands mentioned are trademarks of their respective 

owners and are used for reference purposes only.

Important safety instructions .....................................................................2
Limited warranty ..........................................................................................4
Rear panel connections ..............................................................................5
Rear panel connections cont. ....................................................................6
Front panel controls ....................................................................................6
Source connections ....................................................................................8
Operating instructions ............................................................................. 10
Bluetooth .................................................................................................. 12
Filters ........................................................................................................ 12
Custom installation (C.I.) use .................................................................. 14
Technical specifications ........................................................................... 14
Troubleshooting ........................................................................................ 15

2

Summary of Contents for 851D

Page 1: ...Your music our passion 851D azur Upsampling DAC Digital Pre Amp User s manual 2 ENGLISH...

Page 2: ...d to a mains socket outlet with a protective earthing connection The unit must be installed in a manner that makes disconnection of the mains plug from the mains socket outlet or appliance connector f...

Page 3: ...hot when in use Do not stack multiple units on top of each other Do not place in an enclosed area such as a bookcase or in a cabinet without sufficient ventilation Ensure that small objects do not fa...

Page 4: ...EXCLUSIVE REMEDY OF THE CONSUMER CAMBRIDGE AUDIO SHALL NOT BE LIABLE FOR ANY INCIDENTAL OR CONSEQUENTIAL DAMAGES FOR BREACH OF ANY EXPRESS OR IMPLIED WARRANTY IN THIS PRODUCT EXCEPT TO THE EXTENT PRO...

Page 5: ...on the digital outputs Coaxial To obtain best results use a high quality 75 ohm digital RCA interconnect cable not one designed for normal audio use Toslink Optical Use a high quality TOSLINK fibre op...

Page 6: ...tively pressing the Filter button on the remote will cycle through different digital filter phase modes Linear Minimum Steep Linear inverted Minimum inverted and Steep inverted Alternative digital fil...

Page 7: ...ource inputs Bluetooth BT100 Press to select bluetooth source input using the BT100 dongle To pair devices press and hold for a few seconds to initiate the pairing function Note Disconnect one device...

Page 8: ...cted to the 851A via the Balanced ouput 851A 851D StreamMagic 6 PC USB connection The diagram below shows the USB audio input connection from a personal computer using a type A B USB lead to your 851D...

Page 9: ...f the manual Note When connecting to an 851W Unbalanced connection can also be used if preferred 851D 851W Control Bus connection Control Bus is the recommended method when using the 851D and other Ca...

Page 10: ...and play In this configuration the 851D is able to work at up to 24 bit 96kHz by declaring to your computer that it can handle any sample rate from 32kHz to 96kHz However in some Windows Mac operating...

Page 11: ...where one speaker is further away than the other or the source material itself has a channel imbalance Front IR Used in conjunction with Custom Installation C I systems or IR repeater systems It may...

Page 12: ...internal feed forward in the DSP its impulse response will exhibit some pre ringing In other words when excited with a theoretical impulse the output has both a small amount of pre and post spike amp...

Page 13: ...ion of close in aliasing images Here we have traded a little attenuation of the very highest frequency response 2dB at 20kHz for 44 1kHz material and a little more pre and post ringing for a very stee...

Page 14: ...pt held down for a further 12 seconds an amplifier player Off command is generated 2 Press and hold the Mute button The remote first generates it s mute toggle command Keep the button held down after...

Page 15: ...bit 44 1kHz 48kHz 88 2kHz 96kHz 176 4kHz 192kHz Toslink 16 24 bit 32 192kHz BNC S PDIF and AES EBU 16 24 bit 32 192kHz Line level balanced output Frequency response 20Hz to 20kHz 0 1dB THD 1Khz 0dBFs...

Page 16: ...Audio is a brand of Audio Partnership Plc Registered Office Gallery Court Hankey Place London SE1 4BB United Kingdom Registered in England No 2953313 www cambridge audio com 2013 Cambridge Audio Ltd...

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