While there is no 7.1 source material, most decoders don't send identical signals to the surround back speakers.
THX-EX extracts surround back the same way a Dolby Surround decoder handles the center channel and applies a phase shift between the two speakers so that you get a wide image.
Lexicon Logic 7 is smarter about what goes there and can send completely different signals to the rear speakers.
THX-EX extracts surround back the same way a Dolby Surround decoder handles the center channel and applies a phase shift between the two speakers so that you get a wide image.
Lexicon Logic 7 is smarter about what goes there and can send completely different signals to the rear speakers.