I got my whole system about a month back and watched Body of Lies using 7.1 but I actually don't think it was an option on the BluRay. I do watch games and stuff using all 7 speakers and it does make a difference soundwise, but not huge. I admittedly haven't messed around with the received much, and instead let MCACC work it's magic. To be honest though, when I do fiddle with the DTS on the receiver, I don't notice a positive difference (plays mostly out of 5 speakers). I just put on enhanced sound on my pioneer receiver and it plays much better. Probably doing something wrong, but no time to look up the ins and outs.
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