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the best way to get door speakers to really have strong midbass is to make sure the panel is as "dead" as possible, dynamat works great (the cork type, not butyl rubber type) and will help separate the front/rear waves......but the more solid the panel that the speakers mount to the better the frequency response will be....same concept as if you mounted the speaker in a cardboard box......you'll lose all the lower harmonics due to resonance cancellation.....

my old dd was a nissan hardbody p/u, i had 2 pair of diamond audio 6.5's (2 in each door), dynamatted the inner door, and had the speakers mounted to a 3/4" mdf panel covered in vinyl, it was bolted to the door structure.......these were powered off a large jl audio amp with about 125watts going to each 6.5.......it sounded like i had 2 10" woofers in the truck.....never needed subs in that truck.....