Okay so I normally try download people who do Blu-Ray 720p and there's always the option of getting AAC 5.1 and AC3 5.1 which is better? Seems like the AC3 would seem so because it's usually close to 1 GB larger file than the AAC. And also how would you compare these to DTS? thanks
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All 3 are lossy audio compression formats. AAC is what Apple standardized on and you see it used mostly because Apple devices like it, although I think there may be some European TV broadcast support for it too (not sure on that). AC3 works just about everywhere so it's a good choice if you want to be sure your playback device will work with it. DTS produces a louder sound than other formats and tests have shown that humans will perceive a louder sound as being of higher quality than a softer sound of the same thing. DTS throws away some upper frequencies to compress its audio. Many people swear by it, but we've had a few industry insiders post here about the truth behind it. They're sworn to secrecy because of non-disclosure agreements, but they have strongly hinted that DTS may actually be a lot less faithful to the original sound than most people realize. Honestly they're all pretty good but DTS would typically take up the most space.
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