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Your music + our passion
Compact disc player
User’s manual

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  • Page 1


    Your music + our passion


    Compact disc player
    User’s manual

  • Page 2



    Introduction .................................................................................................2

    Thank you for purchasing this Cambridge Audio Azur 651C CD player.
    Like all Cambridge Audio products, the 651C adheres to our three core
    principles – stunning performance, ease of use and incredible value.

    Important safety instructions .....................................................................3
    Limited warranty..........................................................................................4
    Rear panel connections..............................................................................5
    Front panel controls ....................................................................................6
    Display functions.........................................................................................6
    Apple device compatibility ..........................................................................7
    Remote control ............................................................................................7
    Operating instructions ................................................................................8
    Filter settings.............................................................................................10
    Custom installation (C.I.) use ...................................................................11
    Technical specifications............................................................................11

    Developed as part of our on-going research and development regime,
    including extensive listening tests, we have incorporated many subtle
    tweaks and improvements to our circuits, components and layouts in the
    pursuit of our passion for sound quality.
    Our third generation S3 servo solution is featured which can dynamically
    adjust the focusing, tracking and output level of the disc reading laser in
    real-time. This ensures maximum retrieval of the digital information with
    extremely low data jitter (timing variantions).
    This is complemented by our use of a highly accurate master clock
    oscillator and very carefully designed impedance-matched clock buffering
    schemes. We have also incorporated support for CD-text for those discs
    that feature it.
    Twin WM8742 24bit/192kHz-capable DACs from Wolfson
    Microelectronics coupled to our proprietary Double Virtual Earth Balanced
    filter topology perform the critical Digital to Analog conversion. Special
    Metal Electrode Face resistors, polypropylene caps and custom-made
    electrolytic capacitors have all been used for their superior sound quality.
    A toroidal transformer is fitted to provide lower noise and less waveform
    distortion for quieter PSU operation.
    Another highlight is an eco-friendly low power (<1W) standby circuit. This
    circuit completely powers down the CD player circuits in Standby mode yet
    is itself totally isolated when the CD player is on, thus having no effect on
    sound quality.
    Your CD player can only be as good as the system it is connected to.
    Please do not compromise on your amplifier, speakers or cabling.
    Naturally, we particularly recommend amplification from the Cambridge
    Audio Azur range, which has been designed to the same exacting
    standards as this CD player. Your dealer can also supply excellent quality
    Cambridge Audio interconnects to ensure your system realises its full
    Thank you for taking the time to read this manual; we recommend you
    keep it for future reference.

    Make sure you register your purchase.
    Visit: www.cambridgeaudio.com/sts
    By registering, you’ll be the first to know about:
    ● Future product releases
    ● Software upgrades
    ● News, events and exclusive offers plus
    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 2011


    Matthew Bramble
    Cambridge Audio Technical Director
    and the 651C design team

  • Page 3



    Important safety instructions
    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.

    The lightning flash with the arrowhead symbol within an equilateral
    triangle is intended to alert the user to the presence of un-insulated
    ‘dangerous voltage’ within the product’s enclosure that may be of
    sufficient magnitude to constitute a risk of electric shock to persons.
    The exclamation point within an equilateral triangle is intended to alert
    the user to the presence of important operating and maintenance
    instructions in the service literature relevant to this appliance.

    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 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.

    – 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.

    WEEE symbol
    The crossed-out wheeled bin is the European Union symbol for
    indicating separate collection for electrical and electronic
    equipment. This product contains electrical and electronic
    equipment which should be reused, recycled or recovered and
    should not be disposed of with unsorted regular waste. Please return the
    unit or contact the authorised dealer from whom you purchased this
    product for more information.

    CE mark
    This product complies with European Low Voltage
    (2006/95/EC), Electromagnetic Compatibility (2004/108/EC)
    and Environmentally-friendly design of Energy-related Products
    (2009/125/EC) Directives when used and installed according to this
    instruction manual. For continued compliance only Cambridge Audio
    accessories should be used with this product and servicing must be
    referred to qualified service personnel.

    C-Tick mark
    This product meets the Australian Communications Authority’s
    Radio communications and EMC requirements.

    Gost-R stamp
    This product meets Russian electronic safety approvals.

    FCC regulations
    This equipment has been tested and found to comply with the
    limits for a Class B digital device, pursuant to Part 15 of the
    FCC Rules. These limits are designed to provide reasonable
    protection against harmful interference in a residential installation. This
    equipment generates, uses and can radiate radio frequency energy and,
    if not installed and used in accordance with the instructions, may cause
    harmful interference to radio communications. However, there is no
    guarantee that interference will not occur in a particular installation.
    If this equipment does cause harmful interference to radio or television
    reception, which can be determined by turning the equipment off and on,
    the user is encouraged to try to correct the interference by one or more
    of the following measures:

    Please ensure there is ample ventilation (at least 10cm clearance all
    round). 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.

    – Re-orient or relocate the receiving antenna.

    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.

    – Consult the dealer or an experienced radio/TV technician for help.

    – Increase the separation between the equipment and receiver.
    – Connect the equipment into an outlet on a circuit different from that to
    which the receiver is connected.


  • Page 4

    Limited warranty
    IMPORTANT – The unit will become 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 fall through any ventilation grille. If this
    happens, switch off immediately, disconnect from the mains supply and
    contact your dealer for advice.

    Choose the installation location carefully. Avoid placing it in direct sunlight
    or close to a source of heat. No naked flame sources, such as lighted
    candles, should be placed on the unit. Also avoid locations subject to
    vibration and excessive dust, cold or moisture. The unit can be used in a
    moderate climate.
    This unit must be installed on a sturdy, level surface. Do not place in a
    sealed area such as a bookcase or in a cabinet. Do not place the unit on
    an unstable surface or shelf. The unit may fall, causing serious injury to
    a child or adult as well as serious damage to the product. Do not place
    other equipment on top of the unit.
    Due to stray magnetic fields, turntables or CRT TVs should not be located
    nearby due to possible interference.
    Electronic audio components have a running in period of around a week
    (if used several hours per day). This will allow the new components to
    settle down and the sonic properties will improve over this time.

    Power sources
    The unit should be operated only from the type of power source indicated
    on the marking label. If you are not sure of the type of power-supply to
    your home, consult your product dealer or local power company.
    This unit can be left in Standby mode when not in use and will draw <1W
    in this state. To turn the unit off, switch off at the rear panel. If you do not
    intend to use this unit for a long period of time, unplug it from the mains

    Do not overload wall outlets or extension cords as this can result in a risk
    of fire or electric shock. Overloaded AC outlets, extension cords, frayed
    power cords, damaged or cracked wire insulation and broken plugs are
    dangerous. They may result in a shock or fire hazard.

    Cambridge Audio warrants this product to be free from defects in
    materials and workmanship (subject to the terms set forth below).
    Cambridge Audio will repair or replace (at Cambridge Audio's option) this
    product or any defective parts in this product. Warranty periods may vary
    from country to country. If in doubt consult your dealer and ensure that
    you retain proof of purchase.
    To obtain warranty service, please contact the Cambridge Audio
    authorised dealer from which you purchased this product. If your dealer
    is not equipped to perform the repair of your Cambridge Audio product,
    it can be returned by your dealer to Cambridge Audio or an authorised
    Cambridge Audio service agent. You will need to ship this product in either
    its original packaging or packaging affording an equal degree of
    Proof of purchase in the form of a bill of sale or receipted invoice, which
    is evidence that this product is within the warranty period, must be
    presented to obtain warranty service.
    This Warranty is invalid if (a) the factory-applied serial number has been
    altered or removed from this product or (b) this product was not
    purchased from a Cambridge Audio authorised dealer. You may call
    Cambridge Audio or your local country Cambridge Audio distributor to
    confirm that you have an unaltered serial number and/or you made a
    purchase from a Cambridge Audio authorised dealer.
    This Warranty does not cover cosmetic damage or damage due to acts of
    God, accident, misuse, abuse, negligence, commercial use, or
    modification of, or to any part of, the product. This Warranty does not
    cover damage due to improper operation, maintenance or installation, or
    attempted repair by anyone other than Cambridge Audio or a Cambridge
    Audio dealer, or authorised service agent which is authorised to do
    Cambridge Audio warranty work. Any unauthorised repairs will void this
    Warranty. This Warranty does not cover products sold AS IS or WITH ALL

    Be sure to insert each power cord securely. To prevent hum and noise, do
    not bundle the interconnect leads with the power cord or speaker leads.

    Some countries and US states do not allow the exclusion or limitation of
    incidental or consequential damages or implied warranties so the above
    exclusions may not apply to you. This Warranty gives you specific legal
    rights, and you may have other statutory rights, which vary from state to
    state or country to country.


    For any service, in or out of warranty, please contact your dealer.

    To clean the unit, wipe its case with a dry, lint-free cloth. Do not use any
    cleaning fluids containing alcohol, ammonia or abrasives. Do not spray an
    aerosol at or near the unit.

    Battery disposal
    Please dispose of any discharged batteries according to local
    environmental/electronic waste disposal guidelines.

    These units are not user serviceable. Never attempt to repair,
    disassemble or reconstruct the unit if there seems to be a problem.
    A serious electric shock could result if this precautionary measure is
    ignored. In the event of a problem or failure, please contact your dealer.

    Plug-fitting Instructions (UK only)
    The cord supplied with this appliance is factory-fitted with a UK mains plug fitted with
    a 3-amp fuse inside. If it is necessary to change the fuse, it is important that a
    3-amp fuse is used. If the plug needs to be changed because it is not suitable for
    your socket, or becomes damaged, it should be cut off and an appropriate plug
    fitted following the wiring instructions below. The plug must then be disposed of
    safely, as insertion into a mains socket is likely to cause an electrical hazard. Should
    it be necessary to fit a 3-pin BS mains plug to the power cord, the wires should be
    fitted as shown in this diagram. The colours of the wires in the mains lead of this
    appliance may not correspond with the coloured markings identifying the terminals
    in your plug. Connect them as follows:
    The wire which is coloured BLUE must be
    connected to the terminal which is marked with
    the letter ‘N’ or coloured BLACK.
    The wire which is coloured BROWN must be
    connected to the terminal which is marked with
    the letter ‘L’ or coloured RED.
    The wire which is coloured GREEN/YELLOW must
    be connected to the terminal which is marked
    with the letter ‘E’ or coloured GREEN.
    If a standard 13-amp (BS 1363) plug is used, a 3-amp fuse must be fitted or, if any
    other type of plug is used, a 3-amp or 5-amp fuse must be fitted, either in the plug
    or adaptor, or on the distribution board.


  • Page 5






    Rear panel connections







    AC power socket

    Once you have completed all connections to the amplifier, plug the AC
    power cable into an appropriate mains socket and turn the unit on. Your
    compact disc player is now ready for use.

    Power On/Off

    Switches the unit on and off.

    Control Bus

    In Allows un-modulated commands from multi-rooms systems or other
    components to be received by the unit.
    Out Loop out for control bus commands to another unit.

    IR (Infra Red) Emitter In

    Allows modulated IR commands from multi-room systems or IR repeater
    systems to be received by the unit. Commands received here are not
    looped out of the Control Bus. Refer to the ‘Custom Installation’ section
    for more information.


    Line Output

    Use good quality interconnect cables from these sockets to any line level
    input on your amplifier. For best results and matched performance, we
    recommend connection to a Cambridge Audio Azur amplifier.

    S/P DIF co-axial digital output

    For input to a separate DAC, such as Cambridge Audio DacMagic*, or
    digital recording machine. To obtain best results, use a high quality
    75ohm digital RCA interconnect cable (not one designed for normal audio

    TOSLINK Optical digital output

    Use to connect to the input of a separate DAC* or digital recording
    machine. Use a high quality TOSLINK fibre optic interconnect cable.
    Note: To obtain the best results from your system we recommend using
    only high quality Cambridge Audio interconnects. This will ensure that you
    hear your system as we designed it. Please ask you dealer for details.
    * For more information, see the DacMagic page on the Cambridge Audio website:


  • Page 6

    Front panel controls









    Display functions

    Switches the unit between On and Standby mode. The blue LED will
    remain bright when the unit is on, becoming dim when the unit is in a
    special eco-friendly standby mode. The unit consumes less than one watt
    of power during standby. The unit can remain in Standby mode when not
    in use. It is advisable to switch the unit off at the mains if it is not likely
    to be used for an extended period of time.







    Note: For convenience, the player can be programmed to automatically
    enter Standby mode after a period of inactivity. To enable this feature,
    see “Using the set-up menu” on page 9.

    Infrared sensor

    Receives IR commands from the supplied remote control. A clear,
    unobstructed line of sight between the remote control and the sensor is


    Illuminated during disc playback.


    Indicates that disc playback has been paused.


    Allows you to open and close the disc tray. After placing a CD in the tray,
    press Open/Close to close the tray.


    Plays the disc and pauses play.


    Stops the CD playing.


    Enables you to skip between and search within tracks. Press briefly to
    skip a track. Press and hold to scan through a track.



    Alpha-numeric characters which display playback information. On inserting
    a disc, the CD player will take a few seconds to read the Table of Contents
    (TOC) information from the disc. The display will then show the number of
    tracks on the CD and the total length of the CD.
    If the CD incorporates CD-text, the name of the album will scroll once (the
    number of tracks remains stationary throughout). Once playback of an
    individual track begins, the track number, total number of tracks and playtime will be displayed. On a CD containing CD-text, the track name will
    scroll once. Pressing the i (Info) button on the remote control will redisplay the CD-text.


    Indicates random playback mode.


    Illuminated when displaying time remaining on track or disc.

    Repeat All/Track

    Illuminated when ‘Repeat Track’ or ‘Repeat All’ is selected.


  • Page 7



    The 651C is supplied with an Azur Navigator remote
    control that operates both this CD player and Cambridge
    Audio Azur range amplifiers. Insert the supplied AAA
    batteries to activate. Always use alkaline-type batteries.


    Speaker A/B
    Toggles the speaker terminals on the rear panel to
    output speaker A only, speaker B only, both speakers A
    and B or no speaker output at all. The speaker indicators
    on the front panel of the amplifier show which speaker
    terminals are selected.

    Switches the amplifier between On and low power ecofriendly Standby mode.

    Volume controls
    Increases or decreases the volume of the amplifier

    Opens and closes the disc tray.

    Numerical track select
    Press the number of the desired track. The track will
    then play automatically from the start of the track.

    Track select
    To select a track number greater than nine, press -/-followed by the track number. Playback of the chosen
    track starts automatically.




    Press the relevant button to play, stop or pause the CD.

    Right Skip Press to skip forward by one track on the
    Left Skip Press to skip backward by one track on the

    Press and hold to scan within the selected track. Hold
    down for seven seconds to increase scan speed. Press
    the right button to fast forward, the left button to rewind.





    The six source select buttons are used to directly select
    the input source to the amplifier.
    Note: the Tape Monitor input works in a slightly different
    way – please refer to your amplifier user’s manual for

    Apple device compatibility
    The Azur 651AC Navigator remote control can control the
    basic functions of Apple devices such as Apple TV and
    Apple’s iPod/iPhone/iPad range when docked in a
    Cambridge Audio or Apple dock.
    Press and hold the source button that corresponds to
    the input that the Apple product is connected to whilst
    also pressing one of the buttons below.
    The functions are slightly different depending on the
    Apple product.
    Stop or Menu

    Used with CDs that support CD-text. In stop mode, press
    to toggle between album name and total time on the
    display. During playback, press to toggle between track
    name and track time.

    Alters the brightness of the display backlight. There are
    three levels of brightness: Bright, Dim and Off.




    Read the ‘Operating Instructions’ section of this manual
    for information on the functions of these buttons.
    Note: these buttons will function only when the display
    backlight is in either ‘Bright’ or ‘Dim’ modes. If it is set to
    ‘Off’, the functions do not respond.
    Please note that the following buttons will only operate
    a matching Cambridge Audio Azur amplifier:


    Press briefly to skip or navigate left or right.
    Press and hold to scan forwards or backwards.
    Used to control volume and/or navigate menus.

    Used to navigate menus.

    In addition, the Azur remote can be paired with up to six
    specific Apple devices using any of the six source
    buttons. This can be useful if you have more than one
    Apple product.
    For more information on pairing refer to your Apple
    device’s instruction manual.
    Pairing – To pair with an Apple device, press and hold
    the required source button along with the
    button for
    six seconds. Some devices like Apple TV have visual
    indication once pairing is achieved.
    Un-pairing – To un-pair an Apple device, press and hold
    any of the source buttons along with the button for six

    Cycles through the amplifier’s source inputs.

    Mutes the audio on the amplifier. The mute mode is indicated by the
    source and speaker LEDs flashing. Press again to cancel mute.
    Note: The speaker outputs, Pre-out and headphone outputs will all be
    muted. The Record outputs are unaffected.



    Remote control

  • Page 8

    Operating instructions
    Loading and unloading discs
    1. Press the Open/Close ( ) button.
    2. When the disc tray has opened fully, place a disc carefully in the tray
    with the label side facing up.
    3. To close the disc tray, press the Open/Close ( ) button again. When
    the tray, with a correctly loaded disc, is fully closed the CD player will
    read the disc and display the content information.
    4. The disc tray can be opened at any time by pressing the Open/Close
    ( ) button. Only remove the disc after the tray has fully opened.
    – Do not put anything except a compact disc into the tray. Foreign
    objects may damage the mechanism.
    – Do not force the tray by hand during the opening and closing operations.
    – To avoid dirt and dust entering the mechanism, keep the disc tray
    – If the compact disc is badly scratched or too dirty, the player may not
    be able to read it or play it.
    – Never load more than one disc into the disc tray at any time.

    Normal disc play
    This unit has been designed to play compact discs,
    recordable CDs (CD-R) and re-writable CDs (CD-RW) bearing
    the identification logo shown here. No other discs can be
    used. Any CD-R/CD-RW discs should contain properly recorded TOC (Table
    of Contents) information so that they can be played back. This unit can
    play only the discs recorded in the CD-DA format designed for music
    reproduction. Do not attempt to play a disc containing other data, such as
    a CD-ROM for PCs with mp3 or WMA files, on this unit.
    1. Switch on your amplifier and set its input selector to the correct
    position. Adjust the volume control to a minimum.
    2. Press the Open/Close ( ) button to open the disc tray and load a
    3. Press the Open/Close ( ) button again to close the tray. The CD
    player will read the disc.
    4. To begin playback, press Play ( ).
    5. When the last track has finished playing, the display will return to
    Table of Contents (TOC).
    6. To stop the disc at any point, press the Stop ( ) button. Pressing the
    Pause ( ) button while the disc is playing will pause the disc and
    illuminate the pause icon on the display. Playback can be resumed
    by pressing the Play ( ) button again.

    Locating a specific track during playback
    1. A single short press of the Skip/Scan ( ) button will take you to the
    beginning of the next track on the CD. Repeat as necessary.
    2. A single short press of the Skip/Scan ( ) button will take you to the
    beginning of the previous track.

    Alternatively, press Repeat ( ) twice, select the chosen track using
    the numerical buttons on the remote control and press Play ( ).
    4. Press the Repeat ( ) button again either before or during playback
    to turn off the repeat function.
    – ‘Repeat Track’ is not available in Program mode.
    – Selecting ‘Repeat Track’ when ‘Random’ mode has been selected
    will automatically cancel ‘Random’ mode.

    Playing tracks in random order
    1. Ensure that a disc is loaded.
    2. Press the Random ( ) button on the remote control. ‘Random’ will
    appear on the display.
    3. Press the Play ( ) button. The CD player will now play the entire disc
    in random order.

    It is also possible to press the Random ( ) button during playback
    to listen to tracks in random order.
    4. Press the Random ( ) button to exit the Random function. The disc
    will continue playing to the end in the correct order.
    5. Press the Stop ( ) button at any time to stop the disc.
    Note: Selecting ‘Random’ mode when ‘Repeat Track’ has been selected
    will automatically cancel ‘Repeat Track’ mode.

    Using the Remain function
    1. Ensure that the disc is playing.
    2. Press the Remain ( ) button on the remote control once to display
    the time remaining for the track playing.

    Locating a specific track when playback is stopped
    1. A single short press of the Skip/Scan (
    ) button will skip between
    2. Press and hold to scroll rapidly through tracks.
    3. Press the Play ( ) button to start playback from the selected track.

    3. Press the Remain ( ) button a second time to show the total
    remaining disc time.

    Repeating discs and tracks
    1. Ensure that the disc is loaded.
    2. Press the Repeat ( ) button on the remote control. ‘Repeat All’ will
    appear on the display. Press the Play ( ) button. The whole disc will
    now be repeated until the function is turned off.

    3. To repeat a specific track, press the Repeat ( ) button twice while
    the track is playing. ‘Repeat Track’ will appear on the display. Press
    Play ( ) and the selected track will now repeat until the function is
    turned off.


    4. Press the Remain ( ) button again either before or during playback
    to return to normal play mode.

  • Page 9

    Programming disc play
    It is possible to program the 651C to play back in any order only the tracks
    you wish to listen to.
    1. Ensure that a disc is loaded. The display should show the TOC data.
    2. Press the Prog button on the remote control. The Program set-up will
    appear in the display (as long as the display backlight is set to ‘Bright’
    or ‘Dim’ modes). ‘ST:01’ will flash.


    9. You can use the Skip/Scan (
    ) buttons on your remote control to
    move through your programmed selection in the same way as normal
    10. Pressing the
    button during playback will take you back to the
    ‘Program Mode’ stage. Pressing the
    button again at this point
    deletes the program.
    – During programmed playback, it is possible to use the ‘Remain’
    function only to show the time remaining on the track playing. You
    can not view the time remaining on the disc.
    – Only the ‘Repeat All’ feature can be used during Program mode. You
    are not able to repeat specific tracks in the program.

    , 0-9 or -/-- buttons, skip to or enter the track number
    3. Using the
    that you want to program as your first track.

    Using the set-up menu

    4. Press the
    button. The desired track is now programmed. The
    program number automatically increases by one for the next entry.

    1. Press and hold the Stop ( ) button for five seconds to open the setup menu.
    2. Scroll through the menu (shown below) using the Skip/Scan (
    3. Press the Play ( ) button selects a sub-menu. Scroll through submenu options with the Skip/Scan (
    ) buttons. The default setting
    is indicated by the symbol .
    4. Select an option by pressing the Play ( ) button.
    5. Return to the sub-menu or exit the options menu by pressing the Stop
    ( ) button.

    5. Repeat steps three and four until all your desired tracks are entered.
    A maximum of 30 tracks can be programmed.
    6. To go back and change a programmed track, press the
    to locate the desired program step. ‘ST:0-’ does not flash.

    – It is not possible to access the set-up menu during disc playback.
    – The Stop ( ) button on the remote control cannot be used to open
    the set-up menu. Once you have accessed the menu, however, the
    remote control can be used to scroll through and select sub-menu

    The 651C allow the setting of some options related to Auto Play, Auto
    Power Down and the digital filters used by the D/A converters.

    Press Stop for 5 seconds

    Press the
    buttons to choose the replacement track. ‘ST:0-’
    flashes to indicate a change of program. Press the button to select
    the new track and continue.

    Filter Settings

    Auto Play

    Auto Power Down

    phase phase


    Press the Prog or





    button to exit.


    Filter Settings
    Press the Prog button again to return to program editing. At this point
    you can either press the
    button again to delete the program and
    return to TOC display, or press the
    button to start playing your
    8. When the button is pressed, ‘Program Play’ appears briefly on the
    display and playback of the programmed tracks commences.

    See page 10 for more information.

    Auto Play Setting
    If required the 651C can automatically play disks inserted into the drawer
    without the Play ( ) button having to be pressed. Auto Play is simply
    enabled in the menu when desired. The default setting for Auto Play is

    Auto Power Down Setting
    If desired the 651C can shut itself down if not used for a period of time.
    Power down after an inactive period (no disk playback or any functions of
    the player used) of 5, 10 or 15 minutes can be selected. The default
    setting for Auto Power Down is ‘Off’ (i.e. disabled).




  • Page 10

    Filter settings
    The 651C use the WM8742 Digital to Analogue Converter (DAC) from
    Wolfson Microelectronics. The 651C has two DACs in dual differential (i.e.
    one per channel, in an internally balanced mode). These very high quality
    parts allow a range of filters to be selected. There is no ‘right’ choice and
    we encourage you to experiment with the filters and pick the one that is
    best to your ears. The characteristics are shown below:

    Linear phase

    Impulse Response

    Response (dB)

    This filter exhibits a linear phase shift (i.e. constant group delay) so that
    all audio signals are time coherent, in the time domain there is a little
    pre-ringing and post-ringing. Out of band rejection is good.


    Minimum phase

    Impulse Response

    Response (dB)

    This filter has similar out of band rejection to above but trades a slightly
    non linear phase shift with frequency for no pre-ringing in the time



    Impulse Response

    Response (dB)

    This filter exhibits strong attenuation of anti-aliasing images outside the
    pass band (i.e. above 22.05kHz) at the expense of a little roll off at 20kHz
    and some pre-ringing and post-ringing in the time domain.



  • Page 11

    Custom installation (C.I.) use


    The 651C feature a Control Bus input/output that allow un-modulated
    remote control commands (positive logic, TTL level) to be received
    electrically by the unit and looped to another unit if desired. These control
    commands are typically generated by custom installation (multi-room)
    systems or remote IR receiver systems. The Control Bus sockets are
    colour-coded orange.

    There is no power

    An IR Emitter Input is also provided that allows modulated IR remote
    control commands to be received electrically by the unit. Commands on
    this input operate the unit only and are not looped out demodulated on
    the Control Bus Output.
    In addition the units feature 'direct' IR/Control codes as well as toggle
    codes for some of their features to simplify programming custom
    installation systems. Special direct On/Off and Mute commands can be
    accessed on the supplied remote control for teaching into C.I. systems or
    learning remotes as follows:
    1. Press and hold the Standby button. After 12 seconds, the remote
    first generates a Standby (toggle) command for Azur CD players. Keep
    holding the button down and after 12 seconds a CD player “On”
    command will be generated. If the button is held down for a further
    12 seconds, a CD player “Off” command is generated. After another
    12 seconds, the remote generates a Standby (toggle) command for
    Azur Amplifiers. A further 12 seconds and an Amp “On” command is
    generated. Finally, if the button is held down for a further 12 seconds,
    an Amp “Off” command is generated.
    2. Press and hold the Mute button. The remote first generates a Mute
    (toggle) command for Azur Amplifiers. Keep holding the button down
    and after 12 seconds an Amp “Mute On” command will be generated.
    If the button is held down for a further 12 seconds, an Amp “Mute
    Off” command is generated.
    A full code table for this product is available on the Cambridge Audio
    website at www.cambridge-audio.com.


    Ensure the AC power cord is connected securely.
    Ensure the plug is fully inserted into the wall socket and is switched on.
    Check the unit is switched on at the rear panel.
    Check fuse in the mains plug or adaptor.

    The player will not read the disc
    Check the disc is not loaded upside down.
    Check that the disc is not too scratched or dirty.

    There is no sound
    Ensure that the amplifier is set correctly.
    Check that the interconnects are inserted correctly.

    The disc is skipping
    Check that the disc is not too scratched or dirty.
    Ensure the player is on a firm surface and not subject to vibrations.

    There is a hum coming from the speaker
    Ensure that all cable connections are secure.

    The remote handset will not function
    Check that the batteries have not expired.
    Ensure that nothing is blocking the remote sensor.
    In the event that the above solutions do not remedy your problem, please
    consult our frequently asked questions (FAQ) section on our website:
    You can also use this facility to post a question to our Technical Support
    For all servicing, in or out of warranty, please contact your dealer.

    Technical specifications
    D/A Converter

    Dual Wolfson Microelectronics
    WM8742 24-bit/192kHz capable


    2-Pole Dual Differential Bessel
    Double Virtual Earth Balanced

    Frequency response (+/-0.1dB) 20Hz - 20kHz
    THD @ 1Khz 0dBFs


    THD @ 1Khz -10dBFs


    THD @ 20Khz 0dBFs


    IMD (19/20kHz) 0dBFs


    Linearity @ -90dBFs

    +/- 0.5dB

    Clock deviation

    +/- 20ppm

    Stopband rejection (>24kHz)


    S/N ratio


    Total correlated jitter


    Crosstalk @1kHz


    Crosstalk @20kHz


    Output impedance


    Maximum power consumption


    Standby power consumption


    Dimensions (H x W x D)

    85 x 430 x 305mm
    (3.4 x 16.9 x 12.2”)


    4.8kg (10.6lbs)




  • Page 12

    Cambridge Audio is a brand of Audio Partnership Plc
    Registered Office: Gallery Court, Hankey Place
    London SE1 4BB, United Kingdom
    Registered in England No. 2953313

    © 2011 Cambridge Audio Ltd



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