atldan2010

I have a pair of Cornwall II's and one has had a chronic problem with blowing midrange drivers. The speaker plays fine for a while but when I raise the volume the diaphragm blows. When I take apart the midrange driver the diaphragm is blown completely off the housing and the only thing holding it together is the pair of wires going into the diaphragm. I have already replaced two but something is wrong. I was thinking maybe a faulty crossover is letting in too much voltage, or not regulating it properly, resulting in the blown diaphragm. The crossovers are new but maybe something is broken. Any ideas on isolating or solving the problem would be appreciated. Thanks....D