Sound problems.. I have a dell xps m1330 which is always connected to a set of logitech speakers. i recently discovered that when i'm playing songs through the laptop, the bass becomes very very soft. I can only hear the bass at a comfortable level when i turn it all the way up (which under normal circumstances would be blowing the roof off). I tried to connect my ipod to the speakers, and it works find. Is there something wrong with my laptop's sound card or something? or is there some settings that i need to attend to? thanks