Wayne Parham Messages: 18783 Registered: January 2001
Illuminati (33rd Degree)
It's a hybrid, actually, with the top plate shorter than the coil (like overhung designs) and a center pole that's much longer (like underhung designs). It also has a shorting ring that runs the length of the center pole:
I've put more info about this driver and what I've done to design a speaker with it using your WTPro system at the link below: