I have an e120 that seems to buzz a little in the sustain if I play above the 12th fret? Almost sounds like a snare drum buzz. It is in a blues jr. so it isn't being pushed super hard or anything. There is no rub, and the cone looks fine? Below the 12th it seems fine. Will a cork gasket help? It just has rubber now.
"Mama said, don't go near that river."