Megaphone
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A megaphone, speaking trumpet, bullhorn, blowhorn, or loudhailer is usually a portable or hand-held, cone-shaped acoustic horn used to amplify a person's voice or other sounds and direct it in a given
A megaphone
An electric megaphone is used at a protest (Black Lives Matter, July 2021)
An electric megaphone is used at a protest (Fight Trump, February 2018)
A small sports megaphone for cheering at sporting events, next to a 75 mm cigarette lighter for scale
Horn (acoustic)
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An acoustic horn or waveguide is a tapered sound guide designed to provide an acoustic impedance match between a sound source and free air. This has the effect of maximizing the efficiency with which
Megaphone
…A megaphone, speaking trumpet, bullhorn, blowhorn, or loudhailer is usually a portable or hand-held, cone-shaped acoustic horn used to amplify a person's voice or other sounds and direct it in a given direction. The sound is introduced into the narrow end of the megaphone, by…
A traditional reed bulb horn
A patent horn loudspeaker