I have an philips external sound card and I would like to connect my sony subwoofer. The setup I am doing is 2.1 with my amp connecting with a standard stereo 3.5 to the front output on my soundcard. I would next like to use the rca mono input on my subwoofer to connect it to the LFE output on my sound card. My question is, what kind of male connector do i use with the sound card, mono or stereo? And if stereo what cable do i buy to get the signal to that one rca input on the sub.