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Generate true 5.1 channel surround sound output
"Your Mac can not do real surround sound from its built-in optical audio port; in fact, not even your Apple TV can. "But Wait!" you say, "Yes it can, Apple even advertise surround sound as a feature of the Apple TV!" or "I can play a DVD and I'm hearing surround sound."
Generate true 5.1 channel surround sound output
Also, some video content from the iTunes Store now has both a stereo AAC track and a 5.1 AC3 track. For example, I opened an HD episode of Lost from the iTunes Store in QuickTtime Player and noted the following tracks:
Clicking on the AAC track, then Audio Settings shows two tracks (left and right). Clicking on the AC3 track, then Audio Settings shows all 5.1 tracks.
Playing this on an AppleTV hooked up to a DD receiver would result in proper 5.1 surround sound.
Renting movies on the AppleTV, you are also informed when movies contain 5.1 surround sound at the time of the rental.
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