Originally, Pro-logic was exclusive to movie theaters. The dialogue was
played through center channel speakers located behind the screen, and
the sound permiated through the screen. The center tones were EQd for
this purpose. At home there is no screen, and the center channel is too
" bright". THX accounts for a center channel re-equalization for a
warmer natural sound without screen dampening.
Pro-logic rear speakers are mono. In a large theatre, a natural time
correlation or delay is present due to room acoustics, and speaker
distances from the audience. In a smaller room setting like a
livingroom, our ears default to the nearest speaker, and the other one
"disappears" because it is not far enough away for a natural sound
delay. This diminishes the surround effect. A mono source played through
2 speakers requires a time delay between the speakers to avoid this
default. THX receivers process a delayed signal between the rear
speakers, enhancing the rear localized effects. These are the 2
significant differences between Pro-logic and THX.
Other specifications such as timbre match, placement, and THX certified
speakers etc etc. are less critical IMO. The THX receiver or processor
is responsible for 90% of the improvements.
Mark Dottle
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