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Dolby Laboratories DP570 Stereo System User Manual

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DP570 Multichannel Audio Tool User’s Manual

Configuring a Monitor System Calibrating Speaker Playback Levels

•Formusicmixing,eachspeakerchannelshouldbesettothesameSPL(thesameas

televisionmixing).Thereisnostandardpracticeforreferencelevelsformusicmixing.

Someengineersprefertomixlouderthanothersdo,butifthelevelsbetweenchannels

arecorrect,theoveralllevelisnot

asimportant.

Whenmixingfortelevisionormusicinsmallmixingroomssuchasremoterecording

trucks,theSurroundchannelisgenerallyset2dBlowerthanthefrontchannels.Thistakes

intoaccounttheshortdistancetotheSurroundspeakers.Experiencehasshownthatthis

settingmakesthesound

inthehomeenvironmentveryclosetothesoundheardbythe

mixer.

A.3.5 Generating Test Noise

TheDP570generatestwokindsoftestnoise:pinkandfiltered.Pinknoiseexertsanequal

soundpressurelevelacrosstheentirespectrum.Filterednoiseispinknoisethathasbeen

highpassfilteredatthepreestablishedLFEcrossoverfrequency.

Clickabuttontogeneratetheappropriate kindoftestnoise.Click

Pinkifyourbass

managementsettingisNone.Otherwise,clickFiltered.Thetestnoisebuttonsareshown

inFigure A‐2directlyundertheAnalogOutputscheckbox.

Whenactivated,thetestnoisecyclesaroundthespeakersinorder:Left,Center,Right,

RightSurround,BackSurroundRight,BackSurroundLeft,Left

Surround,andSubwoofer

—remainingtwosecondsateachoutputbeforemovingontothenext.

Thetestnoisefeatureisintelligent.Whenyoubeginanindividualspeakertrimadjustment, 

thetestnoiseremainsatthatspeakeruntilyoucompletetheadjustmentandmoveto

anotherspeaker,allowingyoutoadjusttheSPL

accordingtothefollowing procedure.

A.3.6 Increasing the System Volume

Afterturningonthenoise,raisethemasterVolumesliderslowlyuntilmeterreadings

reachyourtargetSPL.Whenthe systemisproperlycalibrated,thistargetSPLwillregister

0onthemaster

Volumescal e.Ifitdoesnot,adjusttheMasterTrimslideruntilthetarget

SPLmeasures0onthemaster

Volumeslider.Youarenowreadytobeginmakingfine

adjustments.

Warning:Beforeyouturnontestnoise,besurethatyourplaybacksystemissetnohigher

thanmoderatevolume.Iftheplaybacklevelishigh,youriskdamagingyour

speakersandpossiblyyourhearing.ThedefaulttestnoiselevelfromtheDP570

is–20dBFStothedigitaloutputs(+4dButotheanalogmonitoroutputs).

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