A megaphone is a device used to amplify the sound of a voice. It amplifies the sound because of its shape (a hollow cone of metal or plastic), and increases the effective sound power by concentrating the sound in a single direction. Electric megaphones combine a microphone, amplifier, and loudspeaker.
Related category ACOUSTICS AND MUSIC
Home • About • Copyright © The Worlds of David Darling • Encyclopedia of Alternative Energy • Contact