A 70 Watt (Musical Power 140 Watt) ceramic speaker of the highest quality. CLICK HERE FOR A SOUND SAMPLE Nominal Overall Diameter: 307 mm/ 12 inch Musical Power (DIN 45500): 140 Watt Resonance Frequency: 95 Hz Nominal Voice Coil Diameter: 50 mm Magnet Weigth: 4500 gr. Sensitivity @ 1 W, 1m: 99.0 dB