the rear speakers in my supercab 4 door (in the door) make the door-mounted front seat belt tensioners rattle at frequencies below around 70 or so Hz. the speakers are 3-way pioneer 6x9s. its really annoying lol, if anyone can give me any ideas to make them stop, I'd appreciate it. I was thinking something like mounting the speakers on some sort of foam to stop the transmission of frequencies through the door, but then I read about using a damper in the middle of the door panel to kill vibrations, and now I'm confused
thanks in advance.