Bullhorns

A megaphone, speaking-trumpet, bullhorn, blowhorn, or loud hailer is a portable, usually 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. The 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.
Posts about Bullhorns
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    … success is irresistible, but for every Oreo Super Bowl tweet, a hashtag fail proves that many marketers aren’t nimble enough to engage on short timelines. “Rather than trying to get lightning in a bottle,” Brownstein said, “smart marketers understand there are other strategies and tools for amplifying real-time messages.” For example, Brownstein…

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