I'm running a fender p/j through a Hartke 3500 and into a GK Backline 2x10 cabinet. It sounds great, but when I play a B at higher volumes the cab sounds terrible with a nasty buzz. I can play the b anywhere on the neck and it still buzzes. My diagnosis is that the speakers have a resonant frequency the same as a B, but it seems like if a company was making a speaker made to play every note they would have thought of that. Anyone have any ideas?