This high-quality piezo-spherical cap-tweeter can be connected directly at the amplifier or at a diplexer. This tweeter has a vaulted aluminium spherical cap and no conical membrane (as usual with flare loudspeakers). Due to the aluminium spherical cap the acoustic pressure is not so strong as with comparable other piezo-tweeters. In return the loudspeaker has a very broad angle of radiation and a very good brilliant sound. Due to the aluminium spherical cap with its special radius of gyration and very low mobile mass the frequency response is very clean up to 45000 Hz. Therefore this tweeter is especially suitable as ultrasonic loudspeaker for the control of parasites (against rodents, vermins etc.).