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Hi all, here something that is confusing the heck outta me...i have a pioneer elite VSX-43TX receiver and using a (don't laugh, it's temporary) sony ps2 as a DVD player with an optical cable. my receiver is set to automatically turn on my rear surround speakers when it encounters an ES or EX signal. Now, on DTS-ES soundtracks, everything is fine. my rear channels turn on and i get a happy message on my display proclaiming "ES 6.1+THX" , but on all DVDs i've encountered that claim to have a Dolby Digital EX track, my receiver stays in 5.1 mode EXCEPT on certain material on my THX demo disc where the receiver picks up the EX signal, turns on my rear surrounds and says "THX SURR EX". now here's my questions:
Most films that have DD-EX say "Dolby Digital EX 5.1"! like this one here: "Harry Potter and the Chamber of Secrets". what gives? doesn't EX mean 6.1? Are there two different types of Dolby Digital EX? i.e., one that is 5.1 with a matrixed 6th channel and one with a discrete 6th? That would explain why my 43TX would decode two different DD-EX discs differently. But not explain why my receiver stays in 5.1 when i view any of the two Star Wars DVDs in DD-EX. you would think that those films would surely have a discrete rear channel in the mix. Now, I can set my 43TX to keep the rear surrounds on constantly. displaying "THX SURR EX" until the cows come home. but it is really extracting EX data (6th channel) and sending it to my rear surrounds, or just sending left and right surround data to my rears to fill them out? ARGGH! help!
-erik
Follow Ups:
I have a Sony STR-DA4ES and in the manual it states that Dolby EX material makes the surround back go into Matrix mode, which is the same as telling the receiver to "make up" the surround back on it's own, since no surround back channel information resides on the sound mix itself. If I recall correctly, the Dolby EX makes my system go into Matrix surround mode (I refer to this as Fake surround back, since its not generated by it's own channel in the mix itself), but the DTS-ES stuff makes it go into discrete surround back mode (I call this real mode since it has it's own channel in the mix itself). I normally force matrix on all the time, except when I am playing DTS-ES discs, then I put it on auto mode. That way I get "fake" (matrix) surround back all the time (including from Dolby EX sources), and discrete surround back from the DTS-ES discs. If I keep it in Auto mode all the time, I get "fake" (matrix) surround back when playing Dolby EX discs, real (discrete) surround back when playing DTS-ES discs, and no surround back at all otherwise.
DDEX is not a discrete 6.1 system. Only DTS-ES is discrete.
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