There's this thing that I've noticed in dvds. The theatrical trailers in the dvds have much better audio quality than the movie itself. A pretty good example is the star trek: first contact dvd that I have. My home theater setup is not the best but this trailer sounds so well that when playing it I have a feeling I've bought a new pair of speakers and two subwoofers! But the same scenes in the movie itself dont even make me notice them. What is the reason for this? Is the space on a dvd disc insufficient for the theatrical version of the soundtrack? Or is this done for a reason, so that whatever speakers we get the sound wont be as good as in the theater? Have you noticed this? What are your thoughts?