Yep. Sound deadening will help a lot, especially with Mid-bass.
If you deaden the outer skin, this helps keep the sound inside the car and keeps outside noise outside.
If you deaden the inner metal skin, this helps a tremendous amount with mid-bass. IF you want to do a cheap option, deaden the outer skin than use 6mm mdf and masking tape to cover up any service holes.
But if you are going to do it, I say splash out and do both doors in the following,
Fully deaden outerskin
Fully deaden innerskin
Use SD paint (Tar-like) and paint your door trims.
Cover up service holes with 6mm MDF (Remember to seal the mdf with a sealant type paint)
Oh and if you want, some people say using a diffuser behind the speaker greatly reduces standing waves (Personal preference.)
I know of a website that would greatly help you out... www.caraudioaustralia.com
qsilverza or Leviathan on CAA.
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