On some movies that have DD 5.1 soundtracks, the sound seems to sound better (and louder) with more surround sound when I set my receiver for 5 channel surround rather than Dolby Digital. I can set the receiver to Auto (which determines the audio signal on it's own), DD, DTS Cinema or 5 channel sound. I know that DD is supposed to have better effects and channel seperation. My receiver is a Marantz SR8000 and has DD and DTS decoding with 5.1. What is the preferred audio setting? Anybody else have the same experience?