I have a Giga-byte MOBO which has s/pdif input & output. I have a coax cable connecting the two. The EP9ES refuses to unlock. Need to talk to someone who actually has this sort of lashup working. Can replace whatever PC components / interconnects / software needed to make work. Hate the thought of purchasing all those wires to run individual interconnects out the standard speaker lines. S/PDIF was designed just for this.