All movies produced by major film companies have Dolby Stereo soundtracks. When they
reach you via home video sources, the Dolby Surround encoding remains intact. Dolby Pro
Logic relies on the same decoding technology as the professional cinema processors to
decode the movie sound tracks that are found on video. The decoding process results in four
separate sound tracks which are Left Front, Center, Right Front, and Surround. The Dolby
Pro Logic decoded surround signals are monaural, but are reproduced by a non-directional
loudspeaker on each side of the listening area to help diffuse the sound. The Dolby Surround
concept is the heart of the Home Theater audio and video experience.
Dolby Surround encoding is also used for MTS and satellite broadcasts as well as other
audio-only program sources such as compact discs. Use the C39 CINEMA 1 mode with its
Dolby Pro Logic processing to enjoy listening to these other program sources.
Home THX Audio circuits further process all the Dolby Pro Logic decoded signals including
the generation of separate spatially expanded left and right surround signals. Home THX Audio
also specifies that a subwoofer be used. A Home THX Audio system therefore requires six
discrete audio channels and six corresponding loudspeakers.
The C39 provides six audio channels to take full advantage of the exciting sound reproduc-
tion capabilities of a Dolby Surround encoded movie sound track. When the Mcintosh THX-M
module is installed in the C39 the audio enhancements possible by Home THX Audio signal
processing also will be available.
Descriptions of the functions of each channel of a Dolby Surround soundtrack as decoded
by Dolby Pro Logic and the addition of Home THX Audio processing will assist you in better
understanding the use of the various controls, switches and operating procedures of your C39.
DOLBY SURROUND LEFT FRONT and RIGHT FRONT
These two channels are stereo channels in the traditional sense. The left and right signals
provide ambience, depth and spaciousness for reproduction of music and sound from a Dolby
Pro Logic decoded movie soundtrack. The front channels also reproduce similar information
from a two channel stereo source such as a compact disc or audio tape.
DOLBY SURROUND CENTER FRONT
Dolby Surround movie soundtracks are encoded with a Center channel, which also includes
dialog information, to increase the realism of the home theater experience. The Dolby Pro
Logic decoded Center channel is reproduced through a loudspeaker placed in the front center
location, either above or below the viewing screen. A Center loudspeaker provides greater
intelligibility and localization of a movie dialog regardless of the seating position.
DOLBY SURROUND LEFT and RIGHT SURROUND
Dolby Surround soundtracks are encoded with a specially processed surround sound signal.
When decoded by Dolby Pro Logic processing circuits, the surround sounds can include all
types of acoustical information and sound effects that enhance your listening enjoyment. The
Dolby Pro Logic decoded surround sound channel is monaural, however, it is reproduced
through two separate loudspeakers placed on the left and right walls of the listening area.
The surround loudspeakers should radiate sound in a nondirectional manner, allowing the
listeners to hear only a diffused sound. Properly installed surround loudspeakers will provide
ambience, and should not distract from the direct sound reproduced by the front loudspeakers.
HOME THX AUDIO SURROUND CHANNELS
Home THX circuits add additional processing to all the original Dolby Pro Logic decoded
signals. The monaural surround signal is further processed into two separate spatially ex-
panded left and right surround signals.
7
HOME THEATER
AUDIO CHANNEL
CONFIGURATION
WITH DOLBY
PRO LOGIC™
AND HOME
THX AUDIO
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