Az elsõ utalás a hajra (is): "Suitable transducer is required to transform the VLF energy into audible form and this is that makes the electrophonic meteor observation such a rare and capricious phenomenon (Keay 1997). From a group of even closely placed observers one or two may hear the sounds and the others do not. In a series of experiments Keay and Ostwald demonstrated (Keay and Ostwald 1991, Keay 1997) that for audible frequency electric fields various common objects can serve as a transducer. For example, volunteers were able to detect as low as 160 volts peak-to-peak variations of the electric field at 4 kHz frequency, with their hair or eyeglass frames acting as a transducer." különféle hétköznapi tárgyak lehetnek akusztikus konverterek, pld. haj vagy napszemüveg Link