I was looking for a receiver for my HTPC setup, and I found one on Craig’s List, a JVC RX-6030VBK 5.1 receiver (link to manual). Then I bought a Digital Optical Cable with Mini-TOSLINK adapter (like this) to connect from the Mac Mini to the receiver. I was given 5 hand-me-down speakers that I’m going to connect to my pre-wired living room. The only thing I have left is a way to mount the speakers to the wall. I’ll buy something within a week to mount it, then the HTPC will be completed!