I am fairly new to computer speaker setups, and planning to add the YST-SW012 to an existing 2.0 speaker system. After having searched various forums with usually mixed information about connecting this subwoofer to a pc, I am unsure about this setup. Do I just connect the sub with the supplied cable to the center/subwoofer output on my sound card, or do I need a separate receiver or a different cable? Any help is appreciated.