Longtime listener, first time caller here. A couple of basic questions: I have an HDTV that I have the Apple TV connected to via HDMI. Suppose I want to get a 5.1 surround system, can I get 5.1 surround from the Apple TV by having only the TV hooked up to the receiver/speaker system? Or must the Apple TV be hooked up to the receiver? Also, the Dolby Digital Out....a few questions about encoding. I encode most of my movies with Handbrake. Say a video contains 5.1 AC-3 audio. I usually do the first audio track as the default: Dolby Pro-Logic II @ 160kbps. Is that enough for 5.1 audio? I read something about it being "matrixed".. that a receiver or something can decode 5.1 audio from it (pardon me if my terminology is off). The second track I do 5.1 AC-3 passthrough. If the Dolby Digital Out setting is on in the Apple TV, will it play this track by default? Are there any differences in how 5.1 AAC or 5.1 AC-3 playback is performed on the Apple TV? I think I read somewhere that different equipment setups may be required. Lastly, what if I have more than one audio track? For some films I have up to four audio tracks depending on if there is director/actor commentary, etc. Sorry for all the questions. I'm usually pretty good at this stuff but the world of surround and home theater is all new to me.