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I got a great amount of bass back from the doors after using sound deadener. I say "back" because the low end output from the door speakers is wasted in the door due to the numerous holes and large flat sheet metal.
Buy a dynamat trunk kit online for cheap, get some 1/8" dynaliner to completely cover behind the door card and then to top it off stuff some kind of foam stuff back there around the speaker (I saved the plastic foam from packages I've received in the mail).
I've had people ask me numerous times if my system is stock or I hid a sub-woofer somewhere. Seriously, this is all it takes, until you want to go hog wild and put some 12's in.
My tip is not to go crazy on the dynamat though. It is heavy stuff at about a pound per square foot, and you really ONLY need it on flat sheet metal panels, everything else is solved by the dynaliner IMO.
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