I'm willing to bet he used SPDIF rather then analog, which means you are bound by SPDIF format limitations. Besides, you lose quality by using SPDIF, since the Z5500's, not the soundcard, will be doing the audio conversion to analog.
no. Did not use a fiber optic cable. I used the 6 channel direct cables. 3 indivual auxiliaries. sub/center. rear, and front. The sound card is set to digital. There is no option to set it to analog. We have tried.
We have the 5.1 working at the moment. If you look at the pictures I posted. We took all 3 of the 6 channel cables and plugged them into headphone splitters until we were left with 1 auxiliary. That is now plugged into the front stage. And for some reason. 5.1 works that way. Which doesn't make any sense.
P.S. I am not worried about sound quality.