I have an extremely annoying speaker rattle coming from my rear set of spekers in my regular cab truck. I have installed dynamat on both front doors, the floor the rear of the cab and the rear door pillars up to where the seatbelt mounts. But I have not been able to get rid of the rattle

 

Is it ratteling while playing or just when driving? A rattle while playing is very hard to stop. The speaker diaphram may be broken, torn or pulled loose from the drive magnet. Can sometimes be repaired if it's the diaphram with tissue and clear nail polish or laquer but if loose from the drive magnet it's new speaker time.

 

It rattles while playing certin songs and the speakers are brand new its driving me crazy because I can't find out where its coming from.

 

I finally had to put rubber washers under all the mount screws on a friend of mines speakers. Never did find out which screw it was and did all of them!