Tweeter Compression Horn DriverTitanium Diaphragm 1-Inch Copper Voice Coil 20 oz Magnet Structure Frequency Response: 1.2k - 15k Hz Sensitivity: 96dB SPL 1W/1M 4-8 Ohm Impedance 80 Watts RMS 150 Watts Peak Fits Horns with 1 3/8-Inch x 18 TPI Threads