Door speakers

You will not be able to get much fill from door speakers. you could go splits in the doors, but they are build for MID and HIGH range. My advice to you is to POD yours doors out, so you get a better depth for your speakers. The best speaker I know for such an application is a Kenwood 8", 4 way. They are fairly deep, so you will need to pod. But they have wicked midrange.