I just got some msp5's off ebay. I plugged them into (out of?) my sound card, which has a single 3.5mm speaker output. Is there even a way to get stereo out of this? I ran a trs 1/4" adapter, then a 1/4" splitter then two TS cables to each monitor. Now If I pan right, the volume drops--pan left, it increases. Should I use TRS cables also instead of TS? If so, that doesn't really make sense to me.