Polk Audio I-Sonic 2 - Manual (Page 23)

D D
D
Polk Customer Service (800) 377-7655 23
When you see this That means you are And your program That can be delivered by
on the display: listening to: material is: these sources:
Stereo 2 channel Dolby Digital DVD, DSS satellite TV (only with
2/0 special Dolby Digital equipped
satellite receivers), Digital TV
broadcasts (future)
Pro Logic Surround 2 channel Dolby Digital DVD, DSS satellite TV (only with
2/1 special Dolby Digital equipped
satellite receivers), Digital TV
broadcasts (future)
Dolby Digital 5.1 Surround 5.1 channel Dolby Digital Most DVDs, some 12" laserdiscs,
3/2.1 Digital TV broadcasts (future)
Stereo 2 channel Dolby Surround Most Hi-Fi video tapes, some TV
(Pro Logic) encoded broadcasts
Pro Logic Surround 2 channel Dolby Surround Most Hi-Fi video tapes, some TV
(Pro Logic) encoded broadcasts
Stereo 2 channel stereo FM radio stations, CDs, LP records,
most TV broadcasts
Pro Logic Surround 2 channel stereo FM radio stations, CDs, LP records,
most TV broadcasts
STEREO
STEREO
DIGITAL
D D DIGITAL
D D DIGITAL D
D D
D D
PRO LOGIC
PRO LOGIC
PRO LOGIC
The DS-2 system offers four modes of operation: Stereo, Dolby Pro
Logic, 2 channel Dolby Digital and Dolby Digital 5.1 surround. You
might wonder, “what is 2 channel Dolby Digital? Isn’t Dolby Digital
always 5.1 surround?” The answer is no. Dolby Digital is a digital audio
compression system that provides very high fidelity sound quality in
either 2 or 6 channels. (The six channels are Left and Right front,
Center, Left and Right rear and a Low Frequency Effects channel, or
5.1). The vast majority of Dolby Digital program materials are 5.1
multi-channel recordings. Most DVDs have both 2 channel and 5.1
channel Dolby Digital soundtracks. In most cases the default soundtrack
is the 2 channel Dolby Digital soundtrack and you must manually select
the 5.1 channel soundtrack via the DVD’s menu (see your DVD player’s
manual for instructions). But some DVDs only have a 2 channel Dolby
Digital soundtrack permitting only Dolby Pro Logic surround sound.
You can use the Pro Logic mode with stereo sources such as radio, CD,
and tape to get very good surround sound, even though those sources
are not Dolby Surround encoded. Dolby Surround encoding is
compatible with stereo playback, so conventional stereo programs
sound similar to surround encoded program when played with the Pro
Logic surround mode engaged. You may want to leave the DS-2 in the
surround mode all the time.
The chart below shows which modes are possible with which inputs, and
how to tell which mode you are in by looking at the front panel display.
ABOUT SURROUND SOUND
The DS-2 is manufactured under license from Dolby Laboratories Licensing Corporation. “Dolby,” “AC-3,” and the double-D symbol are trademarks of Dolby Laboratories Licensing Corporation.