I am planning to buy the Logitech Z200 speakers and the Polk Audio PSW10 subwoofer, and I am unsure about how to connecting them to my pc. My sound card has 6 3.5mm plugs, including both a center/subwoofer out and line out. Do I just connect the Logitech z200 to the line out, and the subwoofer with 3.5mm cable to the subwoofer out? Or do I need other cables, or a completely different setup? Any help is appreciated.