Cambridge Audio 551R user manual Speakersetup, Speakerdelay, PresstheOSDbuttontoexitthemenu

SettheDecodemodeas5.1or7.1byhighlightingtheDecodeModeitemand usingtheLeftandRightarrowstoscrollthroughtheoptions:

Speaker Config Menu

Decode Mode	:	7.1
Front L/R	:	Large
Centre	:	Small
Surr. L/R	:	Small
Surr. LB/RB	:	Small
Subwoofer	:	Yes

Return : [OSD]

NowmovedownandbyhighlightingeachspeakerinturnandusingtheLeft and Right arrows select from ‘Large’, ‘Small’ or ‘None’ for each speaker. 'Large' or 'Small' are used to describe each speaker in terms of bass response, they do not necessarily reflect the actual physical size of the

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2.Speakersetup

The following two sections can be performed by Cambridge Audio CAMCAS proceduresoyoucanifyouwishjumpstraighttothatsection.However,itis recommendedthatyoudoreadthesesectionstounderstandthereasonsfor thesesettingsandtheirimplications.

Speakerdelay

Because the speakers in a surround sound system are usually different distances from the listener the 551R incorporates the ability to apply a variable digital delay to each of the channels so that the sound from each arrives at the same time at the listening position for best surround-sound effect.

To set the delay times automatically, refer to the Auto setup section of this manual.

To set the delay times manually, simply measure the distances from the listeningpositiontoeachspeakerasshowninthefollowingdiagram:

ENGLISH

speaker.

Large=Speakerswithanextendedlowfrequencyresponseofapproximately 20-40Hz to 16-20kHz (floorstanders or high quality larger stand-mounted speakers).

Small = Speakers with a less extended low frequency response of approximately 80-100Hz to 16-20kHz (small stand-mounted, bookshelf or satellitespeakers).

Setting each speaker allows the 551R to perform what is called Bass Management and to direct low frequency bass from music and the Low Frequency Effects channel of surround sound material to those speakers

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4

3

21=FrontLeftspeaker

2=FrontRightspeaker

3=Centrespeaker

4=SurroundLeftspeaker

5=SurroundRightspeaker

56=SurroundBackLeft (whenused)

bestabletoreproduceit.Ifyoudonotwishtouseanyofthespeakerssetits settingto‘None’.

The Subwoofer output can also be set to Yes or No. If no sub is being used make sure this setting is set to No to allow the 551R to re-direct the bass informationinthischanneltootherspeakers.

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	7	=SurroundBackRight
		(whenused)
7	8	=Subwoofer(canbeplaced
		almostanywhere)

Note:The551Rwillforcesomespeakerstocertainsettingsinthefollowing circumstances!

TheFrontLeftandRightspeakersmaybe‘Large’or‘Small’butnever‘None’ astheyarealwaysrequiredforanytypeofmusic/moviereproduction. Bass must always be reproduced by either the Front Left and Right or Subwoofer channel (or both). Setting the Front Left and Right to ‘Small’ will result in the Subwoofer automatically being set to ‘Yes’. Setting the Subwoofer to ‘No’ will automatically result in the Front Left and Right being setto‘Large’.

IftheFrontLeftandRightcannotreproducelowfrequencybassaSubwoofer mustbeused.I.e.IftheFrontLeftandRightaresetas‘Small’theSubmust beSetto‘Yes’.

Also, setting the Front Left and Right as ‘Small’ will always set the other speakers as ‘Small’ (and the Sub to ‘Yes’). This is because LFE/ bass informationshouldnotberedirectedtothesurroundchannels.

To store the setting simply come back out of the OSD (pressing the OSD button always moves back one menu item, and then exits and stores from themainmenuscreen).

Note:Nodelaysettingforthesubwooferisnecessary.

SetthedistancesintheOSDSpeakerDistancemenutothenearestvaluein metres(1foot=0.3metres).Thespeedofsoundisapprox340metresper second,the551Rthusintroducesapprox3mSofdelaypermetreofdistance set.

Go to the ‘Speaker Distance’ and highlight each speaker in turn. Set the distance to the nearest value to that which you measured by using theLeft andRightarrows(thevaluesdonotneedtobeexact):

PresstheOSDbuttontoexitthemenu.

Speaker Distance Menu

Unit	:	Meters
Front L	:	2.9
Front R	:	2.9
Centre	:	2.9
Surr. L	:	2.0
Surr. R	:	2.0
Surr. LB	:	2.0
Surr. RB	:	2.0

Return : [OSD]

Note: In addition to the delays as set above Dolby Pro Logic II/IIx playback also requires an extra 15 milliseconds delay to the surround channels only. ThisextradelayispartoftheDolbyProLogicIIspecificationandensuresthat soundfromthesurroundsarrivesjustaftersoundfromthefrontreducingthe audibilityofsoundleakagefromthefronttothesurroundspeakers.Because therelationshipbetweentheDolbyDigitalandDolbyProLogicIIxtwodelays isfixed(15mSextratothesurroundchannels),itisonlynecessarytosetthe delay by measuring the distances as we have described. The 551R will automatically provide the appropriate extra delay whenever you switch to a ProLogicMode.

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