Kepo piezo transducers 2048 3100 hz 96 16mm kepo kpm g1240a 6390 the kepo kpm g1240a 6390 piezo transducer 4000 hz 125 mm is energised by a 3vdc rated voltage and has a minimum spl of 85db3vdc2400hz10cm additionally equipped with a 2400hz resonant frequency and housed in black pbt casing suitable for use in professional commercial and industrial applications kepo kpm g1240a 6390 piezo transducer 4000 hz 125mm