Midrange/tweeter Compression Horn Driver with 25 Oz. Magnet 1.35'' (34.4mm) Flat Aluminum Voice Coil - Titanium Diaphragm - 200 Watts RMS / 400 Watts Peak 25 oz. Magnet Structure - 8 Ohm Impedance For Directivity Horns With Four M6 Threaded Holes 90 Around on a 2.36'' (60mm) Diameter Circle Frequency Response: 800Hz~20kHz Sensitivity (1w/1m): 103dB SPL