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Sorry this took a bit to respond. The humming had stopped for awhile and now it's back. I just noticed today that it is only humming when the vehicle is actually turned on and the alternator is running. It makes me fairly sure it is ground noise. I have a decent ground for the subwoofer. I drilled a...

So I went left my car today to pick something up then came back to my car ( I had left it running because it's cold) and when I came back my phone wouldn't reconnect to the Bluetooth on my head unit and my subwoofer was making a humming sound. It's very strange. Never done that before. And very anno...