DJ/PA use Piezo Tweeter Driver Unit 1-3/8"-18 TPI Throat Thread
 

Features: 1-3/8"-18 TPI horn throat thread compression piezo tweeter driver unit. Double sided 1" piezo element coupled with light-weight and yet stiff cone diaphragm provides higher efficiency and extended higher ends. Used with most DJ/PA speaker system with 1-3/8" throat thread horns

Specifications-
    Power Handling: 80W RMS / 200W Peak
    Frequency Response: 2,000 ~ 25,000 Hz
    Nominal Impedance: Piezo technology
    Voice Coil: 1" dia. double sided piezo element
    Magnet Weight: Piezo technology
    Sensitivity: 102dB W/M
    Fs: 3.5K Hz

Dimensions -
    Mounting Thread Size: 1-3/8" dia. 18 TPI