The subwoofer to my home theater rattles everytime the bass hits no matter how loud it is. Ive tried different cords and even used it on my friends system and it sounded fine. Is something wrong with my receiver? Or am I able to fix it with on screen menu on the receiver? All help is appreciated. Oh and does it matter if I turned on "multiple channel in" I turned it on being curious and now idk how to turn it off