I have an ext. cab. 2001 F-150. I just unpluged my amp so only the mids worked, while I played a long 80 Hz. tone. The only thing that really makes any noise is these rear panles that cover the rear mids, and they are LOUD. Should I use weather stripping where the edge of the panels meet the metal, or do I actually need to sound deaden' the panel itself. I'd think the weather stripping would get it.

-AR

 

If you can verify it is the panel rattling against the metal and not the panel itself making the noise you could place a 1/8-1/4" layer of foam in there.

 

I used dynomat on the doors and cans off undercoating in other sections leaving a 1/4 thick layer on the walls, all around, the foam sounds good also for deadining the sound.