I bought refurbished Logitech x-530 speakers and a Zalman soundcard. The speakers will be playing music and then pop and the sound is gone. Then the speakers might work again for a few minutes and then do the same thing. When I just had the front speakers plugged into my laptop's audio out port for headphones they worked fine. Same thing for the center and the rear speakers. But put 'em into a sound card and things get wacky. I previously bought a Creative Live! soundcard and returned it because I thought that was the problem but now the same thing is happening with the Zalman.