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2. TECHNICAL DESCRIPTION
DESCRIPTION
THX
®
is an exclusive set of standards and
technologies established by the world-renowned fi lm
production company, Lucasfi lm Ltd. THX resulted
from George Lucas’ desire to reproduce the movie
soundtrack as faithfully as possible both in the movie
theater and in the home theater.
THX engineers developed patented technologies to
accurately translate the sound from a movie theater
environment into the home, correcting the tonal and
spatial errors that occur.
When the THX mode of the SR7001 is on, three
distinct THX technologies are automatically added:
Re-Equalization-restores the correct tonal balance
for watching a movie in a home environment.
These sounds are otherwise mixed to be brighter
for a large movie theater. Re-EQ compensates for
this and prevents the soundtracks from being overly
bright and harsh when played in a home theater.
Timbre Matching-fi lters the information going to the
surround speakers so they more closely match the
tonal characteristics of the sound coming from the
front speakers.
This ensures seamless panning between the front
and surround speakers.
Adaptive Decorrelation-slightly changes one
surround channel’s time and phase relationship with
respect to the other surround channel.
This expands the listening position and creates with
only two surround speakers the same spacious
surround experience as in a movie theater with
multiple surround speakers.
The Marantz SR7001 was required to pass a rigorous
series of quality and performance tests, in addition to
incorporating the technologies explained above, in
order to be THX certifi ed by Lucasfi lm Ltd.
THX requirements cover every aspect of performance
including pre-amplifier and power amplifier
performance and operation, and hundreds of other
parameters in both the digital and analog domain.
Movies which have been encoded in Dolby Digital,
DTS, Dolby Pro Logic, stereo and Mono will all
benefi t from the THX mode when being viewed.
The THX mode should only be activated when
watching movies which were originally produced for
a movie theater environment.
THX need not be activated for music, movies
made especially for TV, or shows such as sports
programming, talk shows, etc.
This is because they were originally mixed for a small
room environment.
THX and Select 2 are trademarks of THX Ltd. THX
may be registered in some jurisdictions. Surround
EX is a trademark of Dolby Laboratories. Used with
permission.
THX Surround EX—Dolby DIgital Surround EX is a
joint development of Dolby Laboratories and THX
Ltd.
In a movie theater, fi lm soundtracks that have been
encoded with Dolby Digital Surround EX technology
are able to reproduce an extra channel which has
been added during the mixing of the program. This
channel, called Surround Back, places sounds
behind the listener in addition to the currently
available front left, front center, front right, surround
right, surround left and subwoofer channels. This
additional channel provides the opportunity for more
detailed imaging behind the listener and brings more
depth, spacious ambience and sound localization
than ever before.
Movies that were created using the Dolby Digital
Surround EX technology, when released into the
home consumer market may exhibit wording to that
effect on the packaging. A list of movies created
using this technology can be found on the Dolby
web site at www.dolby.com. A list of available DVD
software titles encoded with this technology an be
found at www.thx.com.
Only receiver and controller products bearing the
THX Surround EX logo, when in the THX Surround
EX mode, faithfully reproduce this new technology
in the home. This product may also engage the
THX Surround EX mode during the playback of 5.1
channel material that is not Dolby Digital Surround
EX eocnded. In such case, the information delivered
to the Surround Back channel will be program
dependent and may or may not be very pleasing
depending on the particular soundtrack and the
tastes of the individual listener.
“SURROUND EX™” is a trademark of Dolby
Laboratories. Used under authorization.
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