J3adSeed said:the idea is to add mass to the metal. so that it cuts down on flexing and vibration. if you change out your speakers (this may help some with factory speakers or if you're getting vibration or distortion in midbass) it will really help. the more you do the more it helps of course. i put like 3 layers near the speaker and 2 everywhere else. you can put layers on the inside of the exterior metal, the inside of the interior metal, and the outside of the exterior metal. if you do all this and cover EVERY HOLE you can seal up the door. this make no air from the back of the speaker get to the front. that helps midbass a lot. i've added about 30lb to each door but my speakers hit 50hz with no distortion.
i used RAAM MAT its like 80 bucks or so for a huge roll. its identical to dynamat extreme (a roll of that would cost you about 300ish i think)
Here:aZnTrD2k said:can I get those RAAM MAT in a local store?