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
  • Why are digital marketers struggling to keep up with consumers?

    …, have a two-way conversation and bring value, as opposed to building bigger, better bullhorns.” Consumer platforms change rapidly, and unpredictably When it comes to new technology, consumers have the luxury of experimenting with virtually no downside. Marketers, on the other hand, need to be smarter with their choices. This means moving more…

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