I'm not sure a decent line conditioner will do the trick. IT can, overtime, possibly damage the sub but others in here will know more then I do.

I would somehow get that sub off the circuit. Can't you run a dedicated one for your theatre? I did this a few months back and it was the best thing I ever did for my theatre Hopefully someone in here can help you more..Good luck

For now...don't turn that fan on, LOL.

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Play it LoUd!!