I have a SR MBP and am having trouble on both the bootcamp XP side as well as the Leopard side getting bass output. The bass is really weak in my seinnheiser hd 280s and my klipsch promedia 2.1 speakers when hooked up on either OS but when I hook up to a dell inspiron, my desktop, or anything else, they sound like they should. What gives? The sound is clear enough, its just there is no bass. Ever.