Midrange/Tweeter Compression Horn Driver Titanium Diaphragm 3 (76.2mm) Flat Aluminum Voice Coil 50 oz Magnet Structure Frequency Response: 1kHz - 20kHz Sensitivity: 107dB @ 1W/1M 8 Ohm Impedance 400 Watts RMS/800 Watts Peak Terminals 205 Type Fits Horns with Four M6 Threaded Holes 90 Apart on 4 (102mm) Diameter Circle