Megaphone small

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Megaphone small	Since the s the voice-powered acoustic megaphone described above has been replaced by the electric megaphone , which uses a microphone , an electrically-powered amplifier and a folded horn loudspeaker to amplify the voice. His largest megaphone consisted of over 20 feet of copper tube and could reportedly project a person's voice a mile and a half. Portable megaphones are widely used for crowd management and mass communication. In events like the National Republican and Democratic Conventions of , when electronic public address systems were first becoming popularized, women used these amplifying technologies during the roll call of participants. In the US the ability to use a megaphone in public can be restricted to certain decibel levels, time of day or banned in residential neighborhoods.
Megaphone small	Small Business. The shape of the megaphone directly affects the range of projection; narrower horns compensate for lower power by concentrating sound more sharply than wide horns. Authority control databases NARA. It consists of a microphone to convert soundwaves into an electrical audio signal , an amplifier powered by a battery to increase the power of the audio signal, and a loudspeaker to convert the audio signal to sound waves again. Some protest leaders use electric megaphones to speak to an outdoor crowd or to other protesters. Before it became a megaphone, the bull horn or cow horn or steer horn was a signaling device or bugle used from antiquity.
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Mini Portable Megaphone
Product Features � Measures 7?� tall ? 5? diameter for a compact size � Made from lightweight, durable molded plastic � Available in 12 vibrant sports colors. Keep this small megaphone bedside to summon help. Uses 4 AA batteries, not included; 5" L. Features. Be heard above a crowd; Save your voice from strain; Uses. 10 W megaphone, small design with integrated microphone � Switchable melody � Pistol grip � Low weight � Operating range up to m � High-quality workmanship with.