Axiom Home Page Forums General Discussion Technical Questions Dead sub?

I had the same thing as David, a few years back I heard an occasional thumppppppp or woooooooooooooof coming from somewhere. At first I thought it was rolling thunder off in the distance, but no storms around. It sounded to be coming from within the walls at the porterplex. I know a lot of you think the plex is haunted. It turned out being my 600, unplugging it for a bit fixed the issued. Still no explanation for the stored energy.