I have not one piece of sound dampening on my doors. None. After last nights readjustments, I am starting to get some noticeable midbass when the sub is muted. In fact, I played with it for a while with the sub off. I think sound dampening material would help tremendously with these SilverFlute speakers however, I don't think they are ideal for being in a door... something is just off about the sound they produce. They respond very very well to small EQ adjustments and their tone changes instantly but something seems odd about them. I will sound dampen the door eventually and see if that helps cure the weirdness that I can't put my finger on or if I will need a different type of cone.
What I am used to is an active set of near field studio monitors, literally 2.5ft away from me with an active servo subwoofer down on the floor and all I play is Hires audio through them. If I could get my doors to come close to the punch my monitors put out using 5.25" woofers with the 6.5" woofers the car has, I would be impressed and very satisfied.