I don't know man.....
If your car has the ability to take coaxials on the dash to fire right in your face' date=' by all means set it up that way and make the mid range cone play down to 500hz.
Considering how difficult it is to get mid bass in a vehicle, door speakers should be set up exclusively for mid bass only. Absolutely no more than 500hz.
I'm not in the mind set that a 2-way comp set is going to cover most octaves effectively. I believe you need at least a 3-way setup, not including subs, before things start sounding pretty.[/quote']
Really? I think you should have a listen to my car. Plenty of midbass, great staging, great dynamics, and tonally correct. Mids in doors tweeters in the sail panels. Many people make wonderful sounding cars with mids in doors. You just have to know what you are doing. The fact you are so convinced you can't get a car to sound correct with a 2 way set, leads me to believe you don't have the right tools, or you have no idea what you are doing.