I used to 'mess with this stuff' a long time ago. The key is getting the specs for the particular driver (not easy to do most times). Then tuning the enclosure for the driver. But as most car speakers fit into such weird spaces, I never mastered how to do that exactly (internal volume is what???). Add in sympathetic vibrations and, well, I just threw my hands up. Anyway, I agree that it appears that the ford component driver has some sort of filter on it. Note the total lack of 'Q' in the 50-80hz range. Very odd without a bandpass filter.
Steeda SRI w/CAI intake. Trubendz SS 2.5" . FR Susp/Struts. Tune by Tom (FocusPower). Rota Grids. SAP rear spoiler. Custom front air dam, rocker panel bits and Rear valance.
Last of the Hatches #28