Originally Posted by
89grand
You really don't even need to use a subwoofer as a door midbass. A lot of drivers with a low Qts need some eq work in the lower octaves if not in a ported enclosure, and that would likely lead to more door rattles. A higher Qts should have more lower end naturally in a door. I'd rather have to cut the bass response in a door speaker than boost it. For midbass, the CDT 6x9's do very well. It has cone area larger than a 6.5, and almost as big as an 8", and you wouldn't even need to fab any mounts. Just something to consider. Sure, some 6.5's have more Xmax than the CDT 6x9, but used as a midbass from around 70-80hz and up, more excursion isn't really an advantage.
Sensitivity would usually be a little higher on a midbass/woofer than a subwoofer too, and that's a plus.