I want to connect my xbox to 5.1 speakers. Only digital coax input is free on the system. I don't wan't to use an optical to coax converter. I found this mod that does that. I was wondering if there are any ready solutions on the market? Did anyone try this mod? Did it work well?

I'm also wondering if similar thing could be done to the audio adapter? I do use HDMI.

Just to close this for anyone interested. I got the audio cable (a cheap knock off from fleebay). It was dead easy to rewire it. I took out optical and replaced it with female RCA. If you don't have RCA at hand you can simply rewire one of the stereo outputs instead. Works like a charm.