I just set up my system and i am very happy with it. But - i have been noticing a rattling coming from my subwoofer - at first i thought it was rattling something next to it. but that was not the case. It sounds like it is coming from inside the enclosure - is this normal? I hope this is not normal. I do have it sitting on my hardwood floor - but doesnt seem like it is coming from the floor. should i send the subwoofer back? one more thing - the double bass setting - just curious - do you alot of you guys like this setting?