I have 2 eD 13ov subs in a sealed box. They have performed fine for the past 8 months I have had them. The other day one of the subs started sounding like it had no control of the woofer. On inspection the rubber surround was flexing a great deal while the other was normal
I removed it to verify nothing looked wrong and that no wires had come loose. So I need your expert opinions as to what is going on with this sub.