I have a "Bic Acoustech PL-200 II" Subwoofer, and I need to connect it to my computer. I have a RCA to 3.5 mm cable that I thought would connect the subwoofer directly to the computer (https/www.amazon.com/gp/product/B0081SDKHI/ref=oh_aui_detailpage_o00_s01) I have no clue what I need to do to actually connect it to my computer