Coch, although DTS-ES 6.1 Discrete might be at least theoretically better, as the DTS site Twirly linked shows, there's a very limited selection of those DVDs available. It appears that the Bruce Almighty DVD doesn't have either type of 6.1 format. To give your 6th speaker some work, keep in mind that you can do things such as using Neo:6 instead of DPLII on 2-channel material and DD-EX on regular 5.1 DVDs to derive some information to be sent to the 6th speaker in back.

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Enjoy the music, not the equipment.