Anyone using Dynamat to reduce road noise? Options

[GotToyota]

I'm not sure about you guys, but my Celica has a load of roadnoise, especially in my doors. One part is that my Rockford speakers have too much bass, and the other is the vibrations that come from the door when I'm driving. Now, I know that Dynamat actually dampens noise and vibration, so I was thinking about buying the two door kit. Has anyone used this for this reason, and gotten good results?

-Matt

[Cutrara]

ehh... for road noise dynamat (or other brands of dampeners) isn't really the best choice for curing road noise. Dynamat keeps your speakers from vibrating the sheet metal in the door. The result is tighter bass (less energy is wasted from the speaker flexing the panel). Thats not to say dampening doesnt help with road noise. I noticed a small improvement after using a generic dynamat (all the same stuff, installation is what matters) on the inner and outer skins of the door, the behind rear speakers, under rear seats. Yeah there was a little less road noise but you notice more that you don't have that "junky car sound" when bass hits... especially with amp'd speakers or subs... plus the doors slam with a nice thud and sound less "tin-canny". If you're looking to reduce road noise, you might want to look at closed cell foam... JC Whitney sells it in the carpet section. Other ideas are using an expanding foam like great stuff in your a-pillars and rocker panels. Don't use the triple expanding stuff or you risk damaging a panel. I think someone else mentioned spray on type stuff... a good undercoating can help reduce road noise.