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Sound deadening door panels for more midbass.
Check it out here edited january 13 2015 by second skin.
Deaden the outer sheet metal of the doors.
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.
Use a high quality sound deadening damping material and place it inside the outer sheet metal layer of each door or quarter panel.
Lift the protection under the door panel.
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.
Soundproofing rubber is typically a dense form of neoprene the same stuff they use in wetsuits to insulate against the cold.
Most cars have another layer of protection under the door panels.
Dekiru upgraded 12 pack acoustic panels 12 x 12 x 0 4 inches sound proofing studio foam padding high density bevled edge tiles soundproofing panels great for wall decoration and acoustic treatment 4 1 out of 5 stars 500.
If sound can leak around the sides of your door consider adding soundproofing rubber to the perimeter.
Car sound deadener hand roller sound noise proof insulation tool 5pcs for auto noise roller car sound deadening application installation tool rolling wheel interior accessories with wood handle.
Here is a very nice video showing off a friends use of second skin sound deadener to increase the bass in his door panels.
Dynamat 10435 12 x 36 x 0 067 thick self adhesive sound deadener with xtreme door kit.
Use wood screws to attach the plywood to the door.