I finally got around to fixing my rattling aluminum door panels. I found this thin padding that is used for under new hardwood flooring at Home Depot. It is real thin at 1/16 inch.
Anyway, I figured since I was pulling the door panels, I might as well add some 6x9 speakers to the panels so I can get rid of the junk box speaker behind the seats.
The project was successful for both items. Even on the bumpiest of roads, I no longer have rattling door panels.
And, the speakers really sound good. They are Sonys. But, I really didn't expect to hear deep bass from a door speaker.
Just another minor project out of the way.