Support User Manuals

Dolby Laboratories DP570 Stereo System User Manual

Open as PDF

of 127

Configuring a Monitor System Calibrating Speaker Playback Levels

Dolby

®

DP570 Multichannel Audio Tool User’s Manual 67

A.3 Calibrating Speaker Playback Levels

Thefollowingsectionsdiscussandillustratethestepsinspeakercalibrationinthe order

theyshouldbeperformed.Normallythisentireprocessneedonlybeexecutedoncefor

eachsetofmonitorspeakers.Wedorecommendperiodiccheckstoverifythatcurrent

settingsarestillappropriate.

A.3.1 Setting the Digital Reference Level

Setthisleveltomatchyourstudioʹsdigitalreferencelevelbeforeturningonatestnoise

whencalibratingyourspeakersystem.

Thedefaultvalueis–20dB.AdjustitusingthedialshowninFigure A‐7.

Figure A-7 Digital Reference Level

A.3.2 Setting the Master Trim

SettheMasterTrimshowninFigure 4‐10to0.

A.3.3 Setting the Master Volume

Beforegeneratingtestnoise,makesurethatmasterVolumeissetlow:–20to–30.Usethe

slidershowninFigure 4‐11.

A.3.4 Picking a Target SPL

WhenpickingatargetSPL,itismostimportantthateachofthemainchannelsissettothe

samelevel;theabsolutelevelissecondary.Thefollowingexamplesaresuggestionsfor

selectinganabsolutelevel:

•Forfilmwork,testnoiseatreferencelevelinthemainchannels(Left,Right,Center)

shouldproduceanSPLof85dBc.Forfilmwork,Surroundchannelsare calibratedto

anSPLof82dBcwithSurround3dBAttenuationchecked.ThenetresultisanSPLof

85dBcwhennoiseisplayedthroughthesystem.

•Fortelevisionwork,testnoiseatreferencelevelis

typicallysettoproduceanSPL

rangingfrom79to82dBcforeachofthemainfivechannels.Thelowerreferencelevel

fortelevisionisduetotheloweraveragelisteninglevelsusedbytheconsumer

(typically70to75dBc).

Tip:Tomakethisadjustmentyoumust closetheSetupwindowtoactivatethemain

applicationscreen.Whensatisfied,reopentheSetupwindow.

previous next