PYLE-PRO PDB552 - 1.75" Titanium Horn Driver 8 Ohm 4-Bolt 1.75'' (44.4mm) Flat Aluminum Voice Coil - Titanium Diaphragm - 250 Watts RMS / 500 Watts Peak 40 oz. Magnet Structure - 8 Ohm Impedance For Directivity Horns With Four M6 Threaded Holes 90 Around on a 3'' Diameter Circle Frequency Response: 800Hz~20kHz Sensitivity (1w/1m): 105dB SPL