Portable or hand-held device to amplify voices and sounds
This article is about the amplification device. For the chemical compound, see Megaphone (molecule). For other uses, see Megaphone (disambiguation).
"Bullhorn" redirects here. For the G.I. Joe character, see Bullhorn (G.I. Joe). For the type of tree, see Bullhorn Acacia.
"Loudhailer" redirects here. For the song, see Loudhailer (Maaya Uchida single). For the album, see Loud Hailer (album).
A man using an electric megaphoneA small sports megaphone for cheering at sporting events, next to a 3 in. cigarette lighter for scale
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 holding it up to the face and speaking into it, and the sound waves radiate out the wide end. A megaphone increases the volume of sound by increasing the acoustic impedance seen by the vocal cords, matching the impedance of the vocal cords to the air, so that more sound power is radiated. It also serves to direct the sound waves in the direction the horn is pointing. It somewhat distorts the sound of the voice because the frequency response of the megaphone is greater at higher sound frequencies.
Since the 1960s the voice-powered acoustic megaphone described above has been replaced by the electric megaphone, which uses a microphone, an electrically-powered amplifier and a folded horn loudspeaker to amplify the voice.
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...
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Das Megaphon (lit. 'The Megaphone') is a street newspaper sold by homeless in Graz and other cities in Styria, Austria. It was started in October 1995...
Archived from the original on 4 June 2020. Retrieved 30 April 2019 – via Megaphone. Petrakovitz, Caitlin; Keane, Sean (20 December 2019). "Star Wars: Rise...
trans man. Landsbaum, Claire (October 2017). "Emma Portner's Body Is Her Megaphone". The Cut. Archived from the original on December 1, 2020. Retrieved March...
Retrieved 11 September 2013. S.R. Ashok Kumar (1 May 2011). "Wielding the megaphone". The Hindu. Retrieved 11 September 2013. "Chaya Singh". Geocities.ws...
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could go with her, Captain Smith ignored her, shouting again through his megaphone the message of women and children first. Lucian said, "Never mind, captain...
South" due to his loose-lipped style, often augmented by his trademark megaphone, which he used to instruct and encourage his protégés, to discourage and...
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