I have always wondered how DVD publishers and the studios upgrade the quality of audio and video to new remastered DVD's?? Also, why do some movies have DTS and Dolby Digital sound formats that sound better than others?? Does it depend on the age of the film, or did the studio just produce a better sound mix than another one did?? Some movies I have on DVD, Predator, for example, are in 5.1 Dolby Digital, but the sound is really not that great. The explosions are ok, but compared to explosions of other Dolby Digital films, it doesnt even compare. So, I guess my questions are how do they take the original film and make it so much better for DVD, and why do some Dolby Digital and DTS sound better than others?? (Does it depend on age of the movie, laziness of the studio, or they didnt have much to work with to begin with??) Thanks for any information, and I could not find this on some FAQ boards, so I figured someone here would definitely know.