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In Reply to: RE: What do the two channels add ? posted by oscar on January 30, 2008 at 05:20:02
The player should fold the rear surround info into the side channels so no information should be lost.
The sound should be more envoloping with better localising of information behind you when that is required.
It's a nice plus but you can do without it (you can do without surround at all if you have to) and it does require a room where you have more space behind you than you need to get a 5.1 channel system in place.
David Aiken
Follow Ups:
The 5 speakers are in the ITU configuration(?) but I suspect it might be better (and extremely costly) to add two sidefill speakers and/or rear center(s) for movie soundtracks.
Guess I also need to look at the spec requirements for 5.1 and 7.1 soundtracks. What forces the player/receiver to "fold" 7.1 into 5.1? This seems a fairly nontrivial task for PCM, TrueHD and DTS HD MA soundtracks.
"What forces the player/receiver to "fold" 7.1 into 5.1?"
Simply the fact that you tell the receiver you have a 5.1 system rather than a 7.1 system. It's already doing similar sorts of things if you tell it you don't have a centre speaker or if it's a 5.1 soundtrack and you've told it you have a 6.1 or 7.1 system. I suspect all that gets done to fold 7.1 to 5.1 is that the rear surround info is added to the side surround channel on that side.
David Aiken
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