I hook it up to my bose surround system via optical out. When I play movies in front row I don't think I'm getting true surround sound- I think my receiver is just duplicating channels. And my base doesn't sound like it's pumping the way it should be. I'm comparing all of this from experiences with apple tv which definitely is throwing out a 5.1 signal. I've gone into audio midi setup. And when I try to configure multichannel it only lets me select stereo. - I was thinking I'd be able to at least send out a signal to each speaker to see if it's working properly. Any ideas?