Most cars have another layer of protection under the door panels.
Sound deadening door panels for more midbass.
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On older cars they were simple plastic wraps while on newer ones the protection is also somewhat sound deadening since it s made of foam or fiber materials.
If sound can leak around the sides of your door consider adding soundproofing rubber to the perimeter.
Usually it is easier to cut the mat into strips so that it can be easily slipped through the stamped holes on the inner sheet metal.
Dynamat 10435 12 x 36 x 0 067 thick self adhesive sound deadener with xtreme door kit.
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Deaden the outer sheet metal of the doors.
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Soundproofing rubber is typically a dense form of neoprene the same stuff they use in wetsuits to insulate against the cold.
Lift the protection under the door panel.
Use wood screws to attach the plywood to the door.
The screws will keep the plywood securely in place to absorb sound.
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