INFORMATION

A megaphone, speaking-trumpet, bullhorn, or loud hailer is a portable, usually hand-held, funnel cone-shaped device whose application is to amplify a person’s voice towards a targeted direction and distance. This is accomplished by channeling the sound through a funnel, which also serves to match the acoustic impedance of the voice cords to the air. The natural human voice tends to spread evenly in all directions, whereas when it is sent through a megaphone, the sound is concentrated in a given direction and the coupling of its energy to the air optimized. An electronic megaphone amplifies sound to a higher decibel level. It consists of a microphone, an amplifier and a loudspeaker all in one. Common uses for megaphones are at sporting events, political functions, auctions, emergency situations and generally when one needs to address congregations of people in large areas or outdoors.

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