Fellow readers, I have terrible vibration issues that are robbing my system of midbass and bass from my door JL speakers due to wild vibrations coming from the front doors. They vibrate and resonate like crazy. And rattling of course. I do have generous amounts of dynamat in the doors, but the holes are not covered nor is there any material stuffed in the doors (particularly up high by the window). What are some of the best ways to control these resonance issues that doesn't involve metal fabrication of a garage full of tools??? I know my system can sound wildly better. I just need to be the only thing that's rattling around the car. I have a 1997 Nissan Maxima.