Throat Diameter: 25.4mm(1 in)Mounting Screw: 1-3/8""-18TPI - Frequency Response: 1.2-20 kHz - Net Weight: 2.03 lbs. * Nominal Impedance: 8 OHM - Voice Coil Diameter: 34.4mm(1.35 in) * Rated Power: 200 W (RMS) - Diaphragm Material: Titanium * MAX Power: 300W - Magnet: Ceramic * Sensitivity(1W/1M): 103dB/w/m - Outside Diameter: 3.68 in.