Thank You for the advice. I had read on another thread about the rivet problems and am working up the courage to take these special speakers apart. I have taken the S75 speakers apart and replaced the X- Ovr. boards and drivers but, they were used and abused by someone else so, there was no fear in making repairs. The reason I'm here, is to use

I,m a new member with a woofer problem. I have owned ( since new) a set of M-70 speakers. I have a woofer that breaks up with volume demand. The sound is similar to a finger tapping on the cone. These speakers have never been serviced and have been paired with a Beomaster 4000 since new.