I just bought a polk audio psw10 and wanted to connect it to my pc. I bought rca cables to hook it up with a splitter to 3.5 mm, so it connects. I currently am playing it in my green jack(the main one) but would like to set my sub to work as a sub instead of recieving channels it wont process anyways. I set up 5.1 surround sound, and while it is connected to sub port, the sub sound works when i test it, but as soon as I try to play music on my computer, it doesnt come out of the sub. Any ideas? Thanks in advance!