Sounds like the subs internal amplifier has gone insane/broken. It needs repair/replacement.
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Thanks Elizabeth, I was hoping for something not as bad. Oh well, I still have one to enjoy while the other is getting repaired. I also noticed that we must have a power dispution / surge. These units were plugged directly into the wall. Should I be using a surge protector between the sub and the wall outlet? Luckily both didn't get damaged ...
If you had a surge, I agree with Elizabeth- you probably fried one of the modules in the Class D internal amplifier. I had a lightning strike near my home last spring and it cooked a Rowland Class D amp that was run via a surge protector. The best thing to do in a storm is UNPLUG! Don't bank on a surge protector. Good luck packing up that F113. That thing weighs close to 100 pounds. My F112 came with a fault in the ARO LED, but I said to hell with it- it works, I don't need the green light to go on to tell me it works, and I'm not packing that beast up unless it flat out fails completely.
I guess I'll start running them through a surge protector. We didn't have a storm, just loss of power. The rest of my equipment runs through my Hydra 6. I don't have any problems with any other gear. Should I have a surge unit on the Hydra before going to the power in the wall? I always unplug when a thunderstorm is coming through. I live in Salt Lake and it's still Winter and snowing !!! My luck ........ go figure.
Surge protectors are hit and miss. They often miss during storms, and during power outages they may miss as well. That's a big miss for your gear. I don't think you should unplug after each listening session. I don't do that, it's a hassle. But if we're talking ultimate protection, that's the way to go.