Ok heres the deal, I have a mini-itx computer with dolby 5.1 out. I can either use the 3 minijacks on back or one spdif rca connector. If I'm thinking straight I could simply splice the center channel in with the front channels then run all the channels straight into my four channel amp and the sub to my sub amp...

I frown on using minijacks for some reason, I've seen converters that take spdif rca to toslink and vice versa, but is there anything that would take a spdic rca connection and turn it into 6 seperate (analog?) channels?