My sub has been doing this wierd thing latley. Between songs it will go "thump", or if I change tracks it with go "thud..thump". It only does it with burnt CD's and more so with MP3's. With an MP3 CD it will do it EVERY time. So whats going on? Is it the way the CD is burned, the CD its self, interferance somewhere, or is my sub taking a crap? Anybody else get this? Thanks!