Y-DJ Horn Driver Piezo Tweeter Speaker for use in Music Sound Pro Audio PA Loudspeakers, 100 Watts 8 Ohms 4" Mounts to 1-3/8"- 18 TPI Horn Bass More bang for your buck -- Excellent upper midrange to upper treble tweeter driver Smart conception -- Built in transformer circuit for increased output and power handling Incredible features -- 100 Watts Peak Power / 50 Watts RMS Power, 8 ohms, 1.5KHz to 22KHz Frequency Response, 98dB Sensitivity Easy to mantle and dismantle -- Mounts to any 1-3/8"-18 TPI horn Diameter -- 4 inch, Depth: 2.5 inch