The megaphone is one of the oldest acoustical devices. People learned early that horn-shaped or cone-shaped tubes could be used to increase the audibility of the human voice. However, it took much longer for humanity to discover exactly how megaphones amplify sound.

A Quick History

Many early civilizations used “speaking horns.” Some Native American leaders used birch bark horns to communicate with large groups. In ancient Greece, actors wore masks with cone-like openings around the mouth which amplified their voices. Many inventors ...