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Why does my factory subwoofer thumps when car off and key out?


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Can anyone help me understand why my 2010 Ford Edge Limited's factory subwoofer makes a thumping noise even when the car is off and the ignition key is out? I'm the original owner. It's the strangest thing. It's happened several times. I'm just cleaning out the car or putting something in the trunk and I'll hear a thump noise. Took me awhile to figure out it was the subwoofer. Put my hand on it and every minute or so it just "thumps". Can't figure out what's causing it. Maybe some sort of radio signal interference? Or some audio module in the car going bad? Any ideas out there, or has anyone else had this problem and solved it?

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