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

[soven]

I have extensively deadened my last Celica.
Dynamat in doors outer panel and 6 layers aluminium fire retardant foil(blocker) on the inner panel. Dynamat on trunk floor and other deadening on quarter panels.

I will say that road noise doesnt change by much. The celica is a noisy car and I am still deciding on how I should tackle the problem properly for the current celica.

Dynamat does mass loading with its weight. It adds weight to the metal panel and lowers the resonating frequency of the panel. Mass loading is useful for large flat panels like your doors and quarter panels and roof and stops them vibrating easily(noise). It is not so useful for convoluted panels. Convoluted panels does not need mass loading, so only the blocking feature of the dynamat is "functioning" when you put dynamat on convoluted panels.

Dynamat's shiny aluminium backing does the blocking(stop sound going through). Dynamat's backing is quite thick compared to other deadening materials so it is quite alright. I used fire retardant foil as a better and cheaper alternative.

You can try putting dynamat in your doors and see how it goes but I suspect that most road noise in a celica enters through the firewall and floor pan. Cheaper and less hassle solution would be to get quieter tyres.