I just went down there and it still does it when the coax line in is unplugged. If I turn off the amp on the sub it stops.

What is strange is when I first heard it I was like 20feet away and it was much louder. After powering off/on the switch the first time it pretty much went away. I have to get my ear down right in front of the woofer now to hear an occasional bump bump versus the original thump thump.

I hate when I discover these things. argggg

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