The rated wattage is a function of many different areas of the driver. The coil, magnet, spider etc. High wattage drivers are made (more or less) for use without an enclosure (as in they will not destroy themselves). There very forgiving in that area, but they loose in efficiency. BTW: Old trick. If you remove that foam pad and (carefully) work some batting to fill up the enclosure, you will increase the internal audio volume by 1.2%. Do NOT let the batting come in contact with the spider or cone. When you tested the woofer, did you still have the crossover in place? If so, test just the woofer (no crossover). the lack of a lower resonance ('Q'), well, it's a tad hard for me to believe.
P.S. What are you using for a signal generator? Is it pure sign or quasi?
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