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Cambridge SoundWorks Desktop Theater 5.1 DTT2500 Digital Manual

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Dolby Digital
Dolby Digital (earlier called AC-3)
delivers five discreet full-range
channels (left front, center, right
front, left surround and right
surround) plus a separate Low
Frequency Effects (LFE) channel.
Many soundtracks on the latest
generation laser discs, DVDs and
High Definition Television (HDTV),
are encoded with Dolby Digital
technology.
When a 5.1 channel Dolby
Digital program source is playing,
such as from a Creative PC-DVD
player, the Dolby Digital indicator
light will illuminate automatically.
Note: Not every section of a DVD
will be 5.1-channel encoded. On
many DVDs, only the main movie
program will be available in 5.1
channel sound. Other supporting
chapters (like a “Director’s
Comment” section) may be in
stereo or mono. These sections will
not light the Dolby Digital indicate
or even though the sound will be
properly reproduced by the
DTT2500 Digital.
Dolby Pro Logic
Dolby Surround is an earlier
surround sound standard which is
decoded with a Pro Logic processor
in the DTT2500 Digital. The Pro
Logic steering circuitry derives
separate center and rear channels
from encoded stereo program
sources.
Pro Logic processing provides a
convincing movie soundfield when
the material is specifically encoded
for Dolby Surround. Most older
stereo movie soundtracks will only
be encoded for Dolby Surround,
even though the program source
may be a DVD’s digital output.
Most DVDs containing Dolby
Surround program material will
cause both the Dolby Digital and
Digital Pro Logic lights to
illuminate. DTT2500 Digital will
decode these digitally transferred
Dolby Surround programs through
the digital Pro Logic decoder
automatically.
When listening to DVD movies
with 5.1 channel Dolby Digital
sound, be sure to listen only to the
digital program source. You can
insure this by:
1) making sure your DVD
player’s stereo downmix is
not sent to your soundcard. For
example, disconnect any cable
link between the cards.
2) making sure all four CMSS
indicator lights are off
(MUSIC, MOVIE,FOURPOINT
and STEREO)
3) muting the “CD” input of
your computer’s software mixer/
volume control application.
When playing a DVD game with
a mix of Dolby Digital 5.1 sound (a
digital signal at the SPDIF input)
and soundcard wavetable output
(a signal at the analog input), be
sure to engage the FOURPOINT
mode in the CMSS settings.
CD-ROMs and CD’s with Dolby
Surround encoding will feature
the Dolby Surround logo at the
beginning of the program or on the
packaging. Process these programs
by making sure all CMSS indicator
lights are off and selecting the Pro
Logic Analog Input setting of the
Surround Mode button. Use this
Analog Pro Logic Mode to decode
Dolby Surround program material
at the Digital DIN input.
Do not select a Pro Logic
decoding mode if the program
material is not encoded for Dolby
Surround. Excessive center
channel output will result, and
most stereo effect will be lost. Use
CMSS “Movie” or “Music” modes
to upmix stereo programs to a
realistic 5.1 channel sound field.
Surround Reference
0420000547 REV. B SINGLE 2/9/01, 1:50 PM16
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