Today I had JBL GTO 626 speakers put in the front doors. They sound fantastic. I would highly recommend them. They are nice overall speakers. Plenty of highs,mids and lows.
I also had the front doors Dynamatted while they had the doors apart.
The doors sound much more solid now when closing them. The road noise is also lessened up front. Now I hear the noise coming from the rear seats more than the front which is funny. Sounds like I have a window cracked back there compared to the front noise level. Next I'll change out the rear speakers and Dynamatt back there and the trunk as well.
My concern was that Dynamatt would add a lot of weight to the car. It weighs .48 lbs per sq. ft. Even if you Dynamatted the entire car it would only add 30 - 40 lbs. I'm just doing the doors and the trunk. That will add maybe 10-15 lbs.