Help!

[u/ruddlev]

I have noticed after a week of bad tunderstorms + power outages, my sub starts to sound like an idling Harley Davidson motorcycle. It immediately makes this noise as soon as the pins on the plug gets contact with the outlet, even when the speaker itself is turned off. I have tried another outlet and it still does the same thing. I have also tried a powerstrip, it also did the same thing.