High Quality Driver PD012:
Throat diameter: 2" (50mm) Mounting
 type: bolt-on Nominal
impedance: 8 ohms
Power rating: 800watts 
RMS Sensitivity: 112 dB
Frequency response:  800-16kHz
Recommended crossover: 1.0kHz or higher(12dB/oct.minimum)
Diaphragm material: titanium  Voice coil: 2.84"(72.2mm)
,polyimide film,CCAW winding
Magnet weight:  70 oz(ferrite)