Hi, just want to say thank you to all the pointers I've received. When I removed the subwoofer cover, I could see that the paper cone was separated from the rubber ring on one side of the subwoofer. So, I used some vinyl/rubber repair cement (tip from RFeldes) and put a bead on top on the separation. After drying out overnight, the subwoofer now seems to work ok without buzzing. Thanks again......