††A loudspeaker transforms electrical impulses from a microphone, or other sound-gathering device, into sound. The current travels to a motor, or voice coil, which in turn makes a diaphragm vibrate. This then causes the air to vibrate and sound waves are produced. The first loudspeakers were described in 1924-25. A number of scientists and engineers were responsible, but the biggest single contribution came from C. W. Rice and E. W. Kellog.
Today, loudspeakers are used in all sound-producing systems, such as radios, record and CD players, tape recorders, telephones and television sets.
