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8 Cambridge udio

VentilationIMPORTANT The uni t will become hot when in use. Do not place anythingon top of the unit. Do not place in an enclosed area such as a bookcaseor in a cabinet without sufficient ventilation.Ensure that small objects do not fall through any ventilation grille. If thishappens, switch off immediately, disconnect from the mains supply andcontact your dealer for advice.PositioningChoose the installation location carefully. Avoid placing it n direct sunlightor close to a source of heat. No naked flame sources, such as lightedcandles, should be placed on the unit. Also avoid locations subject tovibration and excessive dust, cold or moisture. The unit can be used in amoderate climate.This unit must be installed on a sturdy, level surface. Do not place in asealed area such as a bookcase or in a cabinet. Do not place the unit onan unstable surface or shelf. The unit may fall, causing serious injury toa child or adu lt as well as serious damage to the product. Do not placeother equipment on top of the unit.Due to stray magnetic fields, turntables or CRT TVs should not be locatednearby due to possible interference.Electronic audio components have a running in period of around a weekif used several hours per day). This will allow the new components tosettle down and the sonic properties will improve over this time.Power sourcesThe unitshould be operated only from the type of power source indicatedon the marking label. If you are not sure of the type of power-supply toyour home, consult your product dealer or local power company.This unit can be left in Standby mode when not in use and will draw

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Rear panel connections

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@ Power On/OffSwitches the unit on and off. This switch is a master on / off control thatcompletely powers down the unit. AC power socketOnce you have completed all connections to the amplifier, plug theAC power cable into an appropriate mains socket and turn the un it on.Your amplifier is now ready for use . Loudspeaker terminalsTwo sets of loudspeaker terminals are available, A (main loudspeakerterminals, top row) and B (secondary switchable loudspeaker terminals,bottom row) . Connect the wires from your lef t channel loudspeaker to theLEFT positive and negative terminals, and the wires from the rightchannel loudspeaker to the RIGHT positive and negative terminals.In each case, the red terminal is the posit ive output and the blackterminal is the negative output.Care should be taken to ensure no stray strands of wire are shortingspeaker outputs together. Please ensure that the loudspeaker terminalshave been tightened adequately to provide a good electrical connection .It is possible for the sound quality to be affected if the screw terminals areloose.The use of A and B speakers affords you an easy and inexpensive way tocreate a simple multi-room system.Note: When using two pairs of speakers, use speakers with a minimumnominal impedance of 8 ohms.@ IR (Infrared) Emit ter InAllows modulated IR commands from multi-room systems or IR repeatersystems to be received by the amplifier. Commands received here are notlooped out of the Control Bus. Refer to the 'Custom Installation' sectionfor more information. Control BusIn Allows un-modulated commands from multi-room systems or othercomponents to be received by the unit.Out Loop out for control bus commands to another unit. SuiK>utThis output can be used to connect to a subwoofer, if desired.

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0 Pre-OutThese outputs can be used to connect to the inputs on an external poweramplifier or an active subwoofer, etc. Record Out 1/2These two identical output sockets can be connected to a tape deck orto the analogue Record In sockets on a Mini Disc or CD recorder etc.51-55These inputs are suitable for any 'line level' source equipment such asBD/ DVD players, DAB or FM / AM tuners, CD players, Netwok Players, iPoddocks, MP3 players, et c.Note: These inputs are for analogue audio signals only. They should notbe connected to the digital output of a CD player or any other digitaldevice.Connecting a turntableIf it is desired to connect a turntable without a built-in phono stage, anexternal phono stage such as our 551P or 651P models should be used.Contact your Cambridge Audio dealer for more details.Note: A very few turntables have built-in phono stages, in which case it isnot necessary to use a separate phono stage amplifier. If you 're unsure,please consult your turntable user manual.@ USB interfaceA USB B type socket is fitted to the 651A to enable the playback of audiofrom a personal computer running either Microsoft Windows or Apple MacOS X operating systems. Some bu ilds of Linux are also suitable.Note: Always use a certified cable for USB Audio preferably one thatdisplays an official mark. USB cable connections longer than 3m mayresult in inconsistent audio performance.

Always turn the Volume to minimum or turn the651A off before plugging/unplugging cables to theUSB input or whil st booting up your PC/ Mac.

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Cambridge udioConnections

Basic connectionote: Before making any connections make sure that the 651A is turnedoff.When designing our ampl i f iers we include featu res th t al low you toconnect your system in variousways . The inclusion offeatures such asPre-Out and Speaker B connections mean th t you can flexibly configureyour system depending on your requirements.

The diagram below shows the basic connection of your amp lif ier toaCD player and apair of loudspeakers.

Rightspeaker

Amplifier

CD pla yer tRecord out connection

1- 0 0 I0 0

Black J Red

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The diagram below shows how toconnect theamplif ierto a tape recorderor other componen t with a record function . Please note th t either of therecord outputs can be used as they are both th esame signal in parallel).

Rightspeaker

Amplifier

Tape/MD player

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8 Cambridge udioConnections cont.

USB audio connect ionsThe diagram b elow shows how to c onnect the ampli fie r to a personalcomputer via USB connectio n . Connect a USB B-A type lead from the 651A USB input to one of the USB ports on the PC.The 651A is USB 1.1 (Full-speed) USB port compatible and support USBAudio 1.0, which works w ith nearly all com mon operating system s(Windows XP Vistaor 7 and Mac OS X10.5 or higher) and computer typeswithout drivers and allows 16bit audio at 32kHz,4 4.1kHz and 48kHz tobe received.

Rightspeaker

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The 65 1Aalso works with m o st builds of Linux using the native Audio 1.0driver. Because Linuxbuilds vary accordi ng to their cre ator s choice ofsoftwar e components includ ing drivers, it is no t possible to guaranteeoperation and Audio drivers may need to be loaded.Class drivers as they are called for generic support of Audio Class 1.0devicemay be available fr om the Linux commu ni ty as we do not supplythese drivers.

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Note: Always use a certified ca ble for USB Audio preferably one thatdisplays an official mark. USB cable conne ctions longer than m mayresult in in consistent audio perform ance.

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PersonalCo mputer

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lo___:

Always turn the Volume to min imum or turn the651A off before pluggin g/unplugging cablesto theUSB input or whi lst booting up your PC/Mac.

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Front panel controlsCambridgeAudio

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Standby/OnSwitches the unit between Standby mode (indicated by dim power LEDand On (indicated by bright power LED . Standby is an eco power modewhere the power consumption is less than one watt. The unit is designedso that it can be left safely in Standby mode when not in use. PhonesAllows for the connection of headphones with a V. jack plug connector.Headphones with an impedance of between 32 and 600 ohms arerecommended. When the headphones are connected, the output to theloudspeakers is switched off (both speakers A and B .@ Infrared sensorReceives IR commands from the supplied Azur remote control. A clear,unobstructed line of sight between the remote control and the sensor isrequired.@ ProtectionLED flashes to indicate activation of CAP5 protection system. Refer to theCAP5 section of this manual for more information. Speaker LEOsIndicator shows the speaker terminals that are selected. The speakerterminals selected are changed with the remote control. DirectThis control gives the audio signal a more direct path to the poweramplifier stage of your amplifier, bypassing the bass and treble controlcircuits for the purest possible sound quality.0 Bass and TrebleThese controls allow subtle adjustments to the tonal balance of thesound. In the central position these controls have no effect. They onlymodify the sound through your loudspeakers and the Pre-Out sockets,and do not affect the signals sent through the Rec Out connections.With well-produced source material and a good system, the tone controlsare unnecessary and can be switched out by the Direct switch. If themusical recording is of poor quality or other factors are affecting thesound quality, it may be necessary to adjust the tone controls tocompensate.

8 I I

VolumeUse to increase or decrease the level of the sound from the outputs of theamplifier. This control affects the level of the loudspeaker output, the pre-amp output and the headphone output. It does not affect the Rec Outconnections. It is advisable to turn the Volume control fully anti-clockwisebefore switching the amplifier on.BalanceThis control allows you to adjust the relative outpu t levelsof the lef t andright channels. In the central position the output from each channel isequal. This control only modifies the sound through your loudspeakersand the Pre-Out sockets - it does not affect the signals sent through theRec Out connections.@ S1/MP3 inputThis source input allows you to connect a portable audio device such asan MP3 player, plugged into either the rear panel Sl Phono/RCA inputpair or the front panel 3.5mm stereo-jack input (labelled MP3 In ).Press the S1 button on the front panel to select the input, or insert adevice into the front panel socket which automatically selects the inputand overrides the rear PhonojRCA sockets.Note: Whilst plugging a device into the front panel automatically selectsthe MP3 input, any other input can still be selected once this has beendone. As a result you may, if desired, leave a device permanent ly pluggedinto the fron t panel.@ 52-55 Source inputsPush the appropriate input selection button to select the sourcecomponent that you wish to listen to. The signal selected is also fed to theRec Out sockets so that it may be recorded. The input should not bechanged whilst recording.@USBThis source input allows connection of a personal computer via USB .

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Cambridge udioechnical specifications

651APower outputTHO (unwelghted)

Frequency response (-1dB)S/N ratio (ref 1WInput impedancesPower Amp damping factorMax. power consumptionStandby power consumptionBassjTreble controlsUSB inputDimensions H x W x D)Weight

12

75 watts (into 8Q)

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Ca mbr idge Au dio isa brand of Aud io Partnership PicRegiste red Office: Gal lery Court Han key PlaceLondon SE1488 Uni ted Kin gdomRegistered in Eng landNo 2953313

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2011 Cambridge Audio Ltd

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QuickStartazur651A651C65N

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What's nthebox?LieferumfangQue contient aboite?Contenidode a cajaosa contiene a confezione?

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For further in format ion bout Cambridge Audio, our products, ne ws, reviewsandsupport, please visit:W eitere lnfos zu Cam bridge Audio, unsere Pro dukte, Neuigke iten, Testberichte undKundendien st f inden Sie unter:Pouro b ten i r des in format ions supp lementa i res sur Cambridge Audio, nos produits,nouveaute s, actual i tes etassistance, veuil lez vous rendre sur notre site :Para obtener masinformac ion acerca de Cam bridge Audio, nuestros productos,noticias, reseiias y soporte, visite:Per m aggiori inform azioni su Cam bridge Audioe inostri prodott i , per notizie,art icol ie assistenza, visitare:Vo or m eer inform atie over Cam bridge Audio, onze producten , nieuws, beoordelinge nen supportondersteuning), kunt u onze website bezoeken:Du kan f indeflere oplysningerom Cambridge Audio, vore s produkter, nyheder ogsupport pa :6one e noAp06HyK> YHcpopMa'-'lf1K>oKOMnaHif f Cambridge Audio, ee npOAYKTax,HOBOCTRX, 063opax lf 9 X H i f 4 9 C K O nOAA9P>KK9 CM. Ha 8 9 6 c a ~

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