Hello. I have an imac and I want to connect my 7.1 system on it. My speakers connect with three jacks (classic green, orange, black). When I connect each one on my imac, I can hear the sound normally, so the imac can support that kind of output. I tried a splitter (this one) and only the green cable works on the splitter. the orange and black jacks have three stripes on them, and they don't work. all I hear is static.. So I guess the splitter is a bit crap, but I couldn't find any other. So, how can I connect my speakers to the imac? is there a better splitter/converted I should try? Any other solutions? Thanks.