I covered my 04 F150 supercrew front doors with Dynamat extreme but the door kits didn't have enough to do the big holes in the doors. I did dynamat what I could reach of the inside of the door directly behind the speakers. I ordered 2 more door kits from ebay at a good price to do my back doors and back of the cab. Road noise is pretty quite in this truck since it was built with this fancy "quite steel". Only reason I am doing this is to improve my speakers performance and maybe make the quite silent.
So I was wondering if covering those big access holes in the doors is worth it? Will it improve the performance of the speakers? Would covering the hole with plywood be a better choice just to get more of a sealed box effect? There's still several 1x1" holes that I can't cover as my door panel hangs on the door and then a few screws secure it. I'm hoping someone can shine some light on this for me. I can post pictures if need be.
Oh tomorrow i'll have Polk MMC6500 in the front and MMC650 in the rear with plenty of "amplifryer" power .