Both Samuel Morland and Athanasius Kircher have been credited with inventing megaphones around the same time in the 17th century. Morland, in a work published in 1655, wrote about his experimentation with different horns. His largest megaphone consisted of over 20 feet of copper tube and could reportedly project a person's voice a mile and a half. [2] Morland favored a straight, tube-shaped speaking device. Kircher's horn, on the other hand, utilized a "cochleate" design, where the horn was twisted and coiled to make it more compact.

Twice the power with two 30 watt PA outputs. You can connect one PA forward and one aft, or transmit out of both simultaneously. Savage, Jason. "The Megaphone Effect in Radio Ads". Houston Chronicle / Demand Media . Retrieved 2 September 2013. Twenty years earlier, Kircher described a device that could be used as both a megaphone and for "overhearing" people speaking outside a house. His coiled horn would be mounted into the side of a building, with a narrow end inside that could be either spoken into or listened to, and the wide mouth projecting through the outside wall. Bernstein, David E. You Can't Say That!: The Growing Threat to Civil Liberties from Antidiscrimination Laws (2003ed.). Cato Institute. p.31.

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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 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. Four foghorn signals can be used depending on the conditions, or use the bells, whistles, horn or siren. The VLH-3000A is designed to keep a uniform look on your boat when used in conjunction with other Standard Horizon equipment. Hanson, Mary Ellen. Go! Fight! Win!: Cheerleading in American Culture. Bowling Green, OH: Bowling Green State University Popular, 1995.

left) Woman using a small handheld electric megaphone at a demonstration in Portugal. (right) Electric megaphones use a type of horn loudspeaker called a reflex or reentrant horn. The sound waves travel in a zigzag path through concentric widening ducts (b, c, and d). Featuring adjustable volume controls and a range of useful features, the Sirenco Megaphone provides unequalled flexibility. Its ergonomic design and lightweight build make it easy to carry and handle, allowing you to effectively communicate over extended periods. Additionally, in ruins of Tiwanaku are stones around the central place with holes shaped in a megaphone's profile. Their purpose is today unknown, but as local guards can show, it is possible to amplify a human voice loud enough to hear it across a large area. As of the 2010s, cheerleading is one of the few fields that still uses acoustic megaphones. Cheerleaders at the University of Minnesota are credited with first using acoustic megaphones in routines in 1898. Since then, cheerleaders have relied heavily on acoustic megaphones during performances at sporting events. Generally, female cheerleaders would use pom poms while male cheerleaders, with loud booming voices, would project cheers through megaphones. [8] Vocal projection is an important aspect for cheerleading, so experts recommend the use of acoustic megaphones not only to increase the volume of sound, but also to protect performers’ voices in the process. [9]For decades, film directors have used megaphones to communicate with their cast and crew on sets where it was hard to hear. The acoustic megaphone became an iconic clichéd symbol of a movie director, although modern directors use electric megaphones. A major contributor to this cliche was Cecil B. DeMille, director of epic movies like The Ten Commandments and The King of Kings. Many of his films were biblical epics set on vast outdoor sets that required communication with hundreds of extras. [10] Montgomery, Henry C. (1959). "Amplification and High Fidelity in the Greek Theater". The Classical Journal. 54 (6): 242–245. JSTOR 3294133. The VLH-3000A has four foghorn options allow automatic foghorn operation. Select the foghorn you need based on the navigation situation you are in. You can also choose from, bells, whistles, horns, and siren. The Sirenco Megaphone is built for performance and durability. With its robust construction and advanced sound amplification technology, your voice will reach far and wide, ensuring your announcements are heard even in noisy environments. Loudhailer" redirects here. For the song, see Loudhailer (Maaya Uchida single). For the album, see Loud Hailer (album). A man using an electric megaphone A small sports megaphone for cheering at sporting events, next to a 3 in. cigarette lighter for scale

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. Man using megaphone with separate microphone Impact on society [ edit ] Silent film director D. W. Griffith using megaphone in 1922

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Kramarae, Cheris. Technology and Women's Voices: Keeping in Touch. New York: Routledge & Kegan Paul, 1988. Prescott, George B. Bell's Electric Speaking Telephone: Its Invention, Construction, Application, Modification, and History. New York: D. Appleton &, 1884. The term 'megaphone' was first associated with Thomas Edison's instrument 200 years later. In 1878, Edison developed a device similar to the speaking trumpet in hopes of benefiting the deaf and hard of hearing. His variation included three separate funnels lined up in a row. The two outer funnels, which were six feet and eight inches long, were made of paper and connected to a tube inserted in each ear. The middle funnel was similar to Morland's speaking trumpet, but had a larger slot to insert a user's mouth. [4]