Compression Piezo Driver - Peak Power Handling, Optimal Sensitivity, Nominal Impedance - Distortion Free Sound, Optimum Midrange Coverage, By GMI Pro PEAK POWER HANDLING: Take your listening experience to the next level! GMI Pros Piezo Driver boasts out-of-this-world power handling for a pro audio sound you will love. OPTIMAL SENSITIVITY: GMI Pro's Compression Driver offers state of the art performance that provides powerful sound with clarity and depth for an out of this world bass sound. NOMINAL IMPEDANCE: GMI Pros Compression Driver can handle significant amounts of amplified power without wearing out your speakers, for a powerful & distortion free sound! USE WITH A WIDE VARIETY OF HORN STYLES: This compression driver features standard 1-3/8"-18 TPI threading, which allows it to work as a replacement driver for many popular horns. DURABLE & LONG LASTING PERFORMANCE: This compression driver doesnt draw an excessive amount of power from your amplifier & ensures long lasting performance from your equipment.