I'm looking to buy some 5.1 Surround PC Speakers for a future 27 iMac purchase (once all the issues go away, hopefully). I have a Logitech set in mind, but as I was looking on Apple's site, I can't seem to find a specific mention of the type of audio the iMac is capable of outputting. Does it support 5.1, or only 2.1? Any help is appreciated, sorry if this has been answered already or if it's a dumb question. I'm not a sound guy.