Painted Paper/Cardboard like cone.
Large rubber surround.
Laminated stamped steel basket.
Rubber magnet boot.
Tiny push terminals.
Dual voice coil.
Large rear pole vent.
Solid construction, although the surround seems overly large making the cone appear much smaller than one's found in a typical 7" driver. I also didn't like the push terminals, which were flimsy and stuck out sideways.
Large pole vent, magnet boot, laminated chassis, and venting under the cone were all nice touches.
The large magnet size and mounting depth may be prohibitive for many people.
Efficiency is quite low for this driver. Also, top end is clearly not suitable for midrange use. Low end sensitivity is very good for in-car door use.
Inductance variation is quite high. Bl curve is off-centered, with severe asymmetry. Suspension is capable of very high excursion.
Xmag appears to be -11mm to +7mm.
Xsus ~12mm 1 way.
My thoughts are this driver will need alot of power to get going, and has the capability for quite a bit of bass output, although it won't be the cleanest bass. Expect fairly large t/s parameter shift as well. I wouldn't even think of using it for midrange reproduction.