OperationSelection of a surround mode is based onpersonal taste, as well as the type of pro-gram source material being used. Forexample, motion pictures or TV programsbearing the logo of one of the major sur-round encoding processes, such as DolbySurround, DTS† Stereo or UltraStereo††may be played in either the Dolby Digital,Dolby Pro Logic or Movie Surrounddepending on the source material.23MODEDOLBY DIGITALDOLBY PRO LOGICDOLBY 3 STEREOTHEATERHALL 1 and HALL 2STEREOFEATURESThis mode is available only when the source material is encoded with Dolby Digital(AC-3) data. It provides up to five separate main audio channels and a special dedi-cated Low-Frequency Effects channel.Dolby Pro Logic is the standard mode for analog surround sound decoding. It usesinformation encoded in a two-channel stereo recording to produce four distinctchannels: Left, Center, Right and Surround. Use this mode for accurate reproductionof programs bearing the Dolby Surround, DTS Stereo, UltraStereo or other“Surround” logos. Surround encoded programs include videocassette, DVD and LDmovies, TV and cable programs, radio programs and audio CDs. Dolby Pro Logicprocessing may also be used to provide a pleasing surround effect with somestereophonic source material that does not carry surround encoding.Dolby 3 Stereo uses the information contained in a surround encoded or two-channelstereo program to create center-channel information. In addition, the informationthat is normally sent to the rear channel surround speakers is carefully mixed in withthe front left and right channels for increased realism. Use this mode when you have acenter-channel speaker, but no surround speakers.Theater Surround processing uses matrix surround decoding to simulate a standardmovie or stage theater.These modes are designed for use with stereo recordings. They provide a sound-fieldeffect that simulates the complex combination of direct and reflected sounds thatcreate the rich reverberant atmosphere of a medium-sized concert hall (Hall 1) or alarger concert hall (Hall 2).This mode turns off all surround processing and presents the pure left and rightchannel presentation of two channel stereo programs.DELAY TIME RANGECenter: 0 ms – 5 msSurround: 0 ms –15 ms15 ms – 30 msInitial Setting = 20 msNo Surround ChannelsFixed at 27 msHall 1 – Fixed at 41 msHall 2 – Fixed at 67 msNo Surround ChannelsSurround Mode ChartNOTE: Once a program has beenencoded with surround information, itretains the surround matrix as long asthe program is broadcast in stereo. Thus,movies with surround sound will carrysurround information when they arebroadcast via conventional TV stations,cable, pay TV and satellite transmission.In addition, a growing number of made-for-television programs, sports broad-casts, radio dramas and music CDs arealso recorded in surround sound. Youmay obtain a list of these programs anddiscs from the Dolby Laboratories website at www.dolby.comWhen a program is not listed as carryingintentional surround information, youmay find that Pro Logic or Dolby 3-Stereomodes often deliver enveloping surroundpresentations through the use of thenatural information present in all stereorecordings. However, for stereo, but non-surround programs, we suggest that youtry the Hall 1, Hall 2 or Theater modes.