Quote Originally Posted by westcott
Caknucke is right but he left one important fact out. There is not a lot of material with 7.1 information so you may not be able to tell a difference in most instances because there is no information to translate.
There's no 7.1 material short of about 2 HD discs at present. But that's irrelevant because you use DPL to create 5.1 or 7.1 from sources with less channels. 6.1 material on dvd's is not discrete, it contains matrixing information for a rear channel.

The fact remains, if you use DPLII you get 5.1 channels. If you use DPLIIx you get 7.1 channels. There's no real difference in the sound, just the number of speakers that get used.