trying to figure this out here, I'm running the Mod2 setup with their sub, and I love the low end sound, on music, movies, etc - but there's one problem. When there's supposed to be a rumble, or thunder or something else, it sounds like complete ****! It's just this loud f'n rattle sound - is this normal? to me, it's just plain bothersome. I'm running a HK 635 with the auto EQ. Any help is much appreciated. thanks.