After a recent power outage that caused my 8 inch mirage sub to power down and back on a few times in rapid succession, the sub now emits a high pitched whine whenever plugged in and powered on, ...

I am completely new to this, so please forgive me if this is an easier question. I have an old starter speaker/subwoofer system (KLH 520) and the way the system is set up (according to the KLH manual) ...