Thx - Pioneer VSX-33TX Operating Instructions Manual

Techno Tidbits & Problem-solving

THX

THX is a Lucasfilm, Ltd. program dedicated to maximum accuracy in movie presentation. Movie sound tracks
are recorded in large movie dubbing stages using movie theater equipment. For a sound track to be presented
accurately in your home, special technologies are required. In your home the room is much smaller and has a
bright sound, the speakers are very different and there are only six of them, plus, you sit much closer to each
one of those speakers. Because of these differences we often miss the power and emotion that thrills us in a
good movie. Now Pioneer and THX have teamed up to bring the full glory of accurate cinema sound to the
comfort and convenience of your home.
Re-Equalization™ : In a theater the room is very large and dead sounding, you sit a long way back from the
speakers and the speakers themselves are very specialized. Because a sound track recorded in this dead
sounding space when it is played at home it sounds overbright. THX Re-Equalization adjusts for this difference
in a very precise way.
Adaptive Decorrelation™ : When a sound track sends mono sound to the surround speakers it often seems
to be coming come from one side instead of from all around you as it would in a theater. Adaptive
Decorrelation helps to correct this inaccuracy.
Timbre Matching™ : When recording a sound track it is very important that the surround sounds move
smoothly and seamlessly around the theater. It is very distracting when sounds seem to jump from speaker to
speaker. Timbre Matching helps to smooth the movement of the surround sounds even though you are using
only two speakers.
Bass Peak Level Manager™ : Some Dolby Digital sound tracks can produce bass peaks that are undesirable
in a home theater environment. The Bass Peak Level Manager allows you to set the maximum peak levels
appropriate to your system. (Set this function according to the Bass Level instructions on page 37.)
Loudspeaker Position Time Synchronization™ : This feature allows you to adjust for the difference in the
distance from each individual loudspeaker to the listening position. Doing this ensures that all the speakers
operate in precise synchronization improving the seamless nature of the soundfield. (Set this function
according to the Channel Delay instructions on p.33.)
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