Altron said:
But it's not like all movies will get a benefit. A lot of movies are mostly dialogue. Watch ANY comedy movie and tell me that it would be funnier with surround. It won't. It's for movies like Star Wars with great sound effects.
Surround does make a great difference when
used, is not like every movie is encoded in 5.1 or 6.1, there are even ones that claim to have a dolby digital ex stream and never use the rear channels. I don't even bother moving speakers to their "right" position when watching that kind of movie.
However, movies that do use surround sound are experienced better with a surround equipment than with stereo. Your ears will know the difference, and in the end, watching a movie is all about sensation.
My understanding of SACD and DVD-A was that they are just encoded better, 192/24 vs. 44.1/16. This of course based on the assumption that they went into the studio and got the original analog tapes, which are stereo, and converted them into 192/24 digital audio. Not sure if any more recent music is actually recorded through five channels.
DVD-A is at most 192/24 in stereo mode, the common option being 96/24 in 5.1. There are recordings made with the intention of being in 5.1.
SACD on the other hand, uses a different encoding approach (DSD). I'd take DVD-A over SACD merely because SACD can't be read in a computer.
Also, old recordings made at studios are generally of far greater quality than the one you should expect from a CD. So remixing them to get a surround mix should not be extremely difficult.
But the debate over wether the extra quality of DVD-A or SACD over properly mastered CD still remains. Personally, I tend to agree that in terms of perceived quality both formats offer negligible advantage, but they have a big plus: surround sound.