As posted above, make sure your dvd player is set to play in the DTS mode. You'll be able to access this with the dvd's remote. Secondly, make sure the dvd is DTS encoded, and you select the DTS option in the dvd discs language options before you play the movie. DTS will not play DD movies, they must be recorded in DTS. DTS Neo 6 which is a matrixed surround, will play DD movies in Neo 6 if you have that option. It's used for 2 channel or 5.1 channel non DTS movies, and sounds very good. IMO, it's a little better than PLIIX - less compression. Finally, make sure the receiver is set to "auto decode" when watching dvd's, and it will automatically read a DTS encoded dvd. DTS setup is not cut and dry, so hope this helps a bit.