<font color='#000000'>The outputs on the dvd players have to be set to bitstream, not pcm (some may say raw instead of bitstream).
Then, the main thing is to make sure the digital inputs on the Denon, have been activated. You have to turn them on. They aren't automatically on. You may need to refer to the manual on how to do this. It's not hard at all. Then once everything is activated, set receiver to digital auto. Then when you insert a dvd, it should automatically go to DD 5.1, when the movie starts. If the movie has a dts track, you will have to go into the movie's menu, and choose the dts track in the audio setup or languages part of menu. It will NOT automatically go to a dts track.
Good luck! Keep us posted as to results?</font>