Sound reproducing apparatus, namely, loudspeakers, equipment containing loud speakers, namely, stereos, CD, radio, MP3, TV, minidisk, phonograph, and cassette players, and equipment containing actuators which create sound, namely, amplifiers, audio speakers, acoustic conduits, transducers, acoustical transducers, audio outputs, headphones, and microphones; personal audio devices, namely, portable equipment which contains loudspeakers and portable equipment which contains actuators which create sound; personal audio devices, namely CD, radio, MP3, TV, phonographs, and cassette players; telephones; cordless telephones and cellular telephones; office communications systems, namely, telephone conferencing, public address and office intercoms; hands-free attachments for cellular telephones, namely, loudspeakers, audio speakers, earphones, microphones, and headphones attached by wire and wireless means; protective helmets incorporating communication devices, namely, communication devices attached by wire and wireless means that contain actuators which create sound; acoustic output devices, namely, amplifiers, audio speakers, acoustic conduits, transducers, acoustical transducers, audio outputs, headphones, and microphones for use with personal audio devices, namely telephones, CD, radio, MP3, TV and cassette players attached by wire and wireless means; magnetostrictive drive units for sound reproduction devices attached by wire and wireless means, namely, loudspeakers and equipment containing loudspeakers that create sound, namely, audio speakers, loud speakers, acoustic conduits, transducers, and acoustic transducers