For an optimal, brilliant and crystal-clear sound in the car! The module increases the music power of your piezo tweeter in the car or in the stereo equipment! With an input power of approx. 1 - 20 Watt the module increases the operating voltage of the piezo tweeter up to approx. 24 V (even from 2 W), which corresponds to a power of approx. 75 Watt. (at 8 Ohm)! The module has simply to be connected between your amplifier (radio) and the piezo tweeter. Integrated are a frequency filter (tweeter ca. 3000 Hz - 40000 Hz) and an output voltage control (< approx. 25 V) as overload protection for the piezo tweeter. With an additional potentiometer 500 Ohm (not included) it is possible to control the power.