I installed 2 JL 12's w0's in a bandpass box with a JL 1000 watt amp. It's in a 1996 Nissan Maxima. My question is, when I go over a bump or uneven road, I hear metal banging in the trunk. This is with the system off. My trunk has two metal bars that move when the trunk opens and closes. There is one metal bar that is sitting right on the sub box. I know I cannot remove or bend it. Is there a solution? Any help is always appreciated. Syberman