Hi, (I did do a search and found several threads about surround sound but none of them seemed to have any conclusive answers, so apologies for the new thread!) I'm a long-time PC user and have just ordered one of the 27" 2011 iMacs. One thing I have yet to work out is exactly how to get surround sound up and running. I will be installing Windows 7 with Boot Camp to play most of my games on, so really my priority is to get surround sound working in Windows. If it works under MacOS as well then that's a bonus. My existing PC has a Creative Labs Inspire T7900 7.1 system with ordinary analogue inputs (Green/Black/Orange output from soundcard, Green/Black/Orange/Grey input to subwoofer unit), and ideally I would like to keep those speakers rather than buying new ones. I know that the only standard way of getting surround output from an iMac is through the optical port. So what I need is either: An adapter that accepts optical input and outputs to 3-port analogue. (I'm not even sure if such a device exists?) An external USB sound card with the analogue outputs. Although it would be nice to get the full 7.1 output, I'd be happy with 5.1, and again, Windows is my priority. Are there any devices that would solve my problem, or am I going to have to buy a new set of speakers with an optical input? Any help would be much appreciated. Thanks!