All emoji namesare official Unicode Character Databaseor CLDR names. Code pointslisted are part of the Unicode Standard. 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). 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. 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]

FITTED WITH BLUETOOTH +RECHARGEABLE LITHIUM ION BATTERIES 8,800ma; OR USE WITH CAR CIGARETTE LIGHTER; CONNECT MULTIPLE SUPER PEARLS SIMULTANEOUSLY; 12 MONTH GUARANTEE; VOICE+SIREN R3900 Savage, Jason. "The Megaphone Effect in Radio Ads". Houston Chronicle / Demand Media . Retrieved 2 September 2013. 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 Hanson, Mary Ellen. Go! Fight! Win!: Cheerleading in American Culture. Bowling Green, OH: Bowling Green State University Popular, 1995. A small compact megaphone that uses very high frequencies that penetrate and carry, while using little power, up to 700 metres. Very economical on batteriesA very loud megaphone suitable for large crowds or evacuation of big areas. Use 8 x D cell batteries R1200 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.

FITTED WITH RECHARGEABLE LITHIUM ION BATTERIES 8,800ma; OR USE WITH CAR CIGARETTE LIGHTER; WITH 12 MONTH GUARANTEE; VOICE+SIREN R3,300 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.Shakespeare PA Hailer Horn Speaker 18cm 30w - HS-40Gets your point across with up to 40 watts power ..