I have an MSI Z68A-G43 (B3) it has on-board sound with 7.1, and i i will be getting Klipsch HD 300 Compact 5.1 High Definition Theater system. i don't know much about electronic hardware. I am wondering what cables, wires, etc. i will need to connect these speakers to my computer. im also wondering if i will need a receiver or an amp to do this because of the subwoofer.