Harman Kardon AVR 75 Owner's Manual

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Advanced Features3. Subtract the distance to thesurround speakers from the distanceto the front speakers.a. When setting the delay time forthe Dolby Digital surround mode,the optimal delay time is the result-ing figure. For example, if the frontspeakers are ten feet away and thesurround speakers are five feetaway, the optimal delay time isfigured as 10-5=5. Thus, in thisexample, the delay should be set atfive milliseconds.b. When setting the delay time foran analog surround mode (ProLogic, Hall, Movie or Matrix) takethe result of the subtraction andadd 15 to obtain the optimal delaytime. For example, if the frontspeakers are ten feet away and thesurround speakers are five feetaway, the optimal delay time isfigured as 10-5+15=20. Thus inthis example, the delay should beset at twenty milliseconds.The Dolby Digital mode also provides aseparate setting for the center channeldelay mode, since the discrete natureof Dolby Digital signals makes thelocation of the center channel speakermore critical. To set the delay for thecenter channel, measure the distancefrom the preferred listening position inthe center of the room to both the centerchannel speaker and either the left orright speaker.If the distances are equal no furtheradjustment is required and the centerdelay should be set to zero. If the distanceto the front speakers is greater than thedistance to the center speaker you maywish to reposition the speakers by mov-ing the front left/right speakers closerto the listening position or the centerspeaker further away from the listeningposition.If repositioning of the speakers is notpossible, adjust the center delay timeso that you add one millisecond of centerchannel delay for each foot that the dis-tance to the center speaker lags behindthe front speakers. For example, if thefront left/right speakers are each 10 feetfrom the listening position and thecenter channel speaker is 8 feet away, thedelay is figured as 10-8=2, suggesting anoptimal center delay of 2 milliseconds.The factory settings for the delay timesare shown in the chart on page 31. If theuse of the formulas described above oryour own experimentation and prefer-ences suggest that the delay time bechanged, the adjustment is made fromthe SURROUND MODE menu.Reach the menu by pressing Select jand then pressing the ¤ button ionce so that the on-screen cursor > isnext to the SURROUND MODE line andthen press Select again. The SUR-ROUND MODE menu (see figure #15)will then appear. If you wish to changethe surround mode before proceeding,use the ‹ or › buttons i until thedesired mode is highlighted in reversevideo. Next press the ¤ button so thatthe cursor is next to CENTER CH orSURROUND CH. (Note that centerchannel delay may only be adjusted inDolby Digital mode.) Press the › buttoni until the desired time is highlightedin reverse video and then press ¤ untilthe cursor is next to RETURN TOMAIN MENU and press Select j.Other adjustments may now be made, ormove the cursor to MENU OFF andpress Select to exit the menu system.Digital Audio PlaybackDolby DigitalDolby Digital (also known as AC-3) is thelatest advancement in surround soundtechnology, delivering up to five full-range surround channels (left, center,right, left surround and right surround)plus a special dedicated Low-FrequencyEffects (LFE) channel. This represents amajor advancement over traditionalanalog surround in that each surroundchannel is fully discrete and capable offull bandwidth reproduction. DolbyDigital is available on DVD and LV discs,and it will be a part of the new highdefinition television (HDTV) systemwhen digital broadcasting begins in1998. Dolby Digital for the home is basedon the same system used to deliver digitalaudio soundtracks in movie theaters,enabling true cinema reproduction inyour home.To utilize the Dolby Digital mode youmust have a digital source properlyconnected to the AVR75. The RF digitaloutput of a laser disc player should beconnected to the AC-3 RF jack a onthe rear panel. Note that this jack is foruse only with the RF output from an LVplayer and should not be connected toany other audio, video or digital device.Digital datastream outputs from DVDplayers, HDTV receivers and CD playersshould be connected to the AC-3/PCMOptical or Coaxial inputs on the rearpanel ° ·. In order to provide a back-up signal and a source for recording,the analog outputs provided on digitalsource equipment should also be con-nected to their appropriate inputs on theAVR75 rear panel. (e.g., connect theanalog stereo audio output from a DVDto the DVD inputs • on the rear panelwhen you connect the digital outputs).When playing back a digital source, firstselect the input using the remote or frontpanel controls d48)!. Nextselect the digital source by pressing theappropriate Digital Input button9g. When the digital source is play-ing, the AVR75 will automatically detect29