Sorry I forgot the sarcasm emoticon... Boe=Bose... The Bose like most antifeedback systems has a fixed number of eq notches to apply to your eq when killing feedback. When it reaches the max number, it reassigns the least used filter(eq notch) to your signal. Problem is that if you are running too hot, the filter released is probably going to ring... so you can get this sweet little jig of circular feedbacks going as the system chases its limits, chases its limits, chases its limits... time to turn down or reorient mics or whatever is ringing.