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2. Horn loudspeaker - Wikipedia

   en.wikipedia.org/wiki/Horn_loudspeaker

   A horn loudspeaker is a loudspeaker or loudspeaker element which uses an acoustic horn to increase the overall efficiency of the driving element(s). A common form (right) consists of a compression driver which produces sound waves with a small metal diaphragm vibrated by an electromagnet, attached to a horn, a flaring duct to conduct the sound waves to the open air.

3. Speaker stands - Wikipedia

   en.wikipedia.org/wiki/Speaker_stands

   Speaker stands, therefore were purpose-built to remove any deleterious colourations that came about through unwanted vibration. Further research has shown that speakers are best positioned so that the tweeter is level with the ear of the listener and so speaker stands are often built so that they line up the speakers with the ear of a person ...

4. Public address system - Wikipedia

   en.wikipedia.org/wiki/Public_address_system

   Early public-address system from around 1920 using a Magnavox speaker. The microphone had a metal reflector that concentrated the sound waves, allowing the speaker to stand back so it would not obscure his or her face. The early vacuum tubes could not produce much gain, and even with six tubes the amplifier had low power.

5. Megaphone - Wikipedia

   en.wikipedia.org/wiki/Megaphone

   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 ...

6. Long-range acoustic device - Wikipedia

   en.wikipedia.org/wiki/Long-range_acoustic_device

   An NYPD LRAD on top of a police humvee An LRAD operator wearing hearing protection LRAD on a navy ship. A long-range acoustic device (LRAD), acoustic hailing device (AHD) or sound cannon is a specialized loudspeaker that produces sound at high power for communicating at a distance.

7. William Campbell - Pay Pals - The Huffington Post

   data.huffingtonpost.com/paypals/william-campbell

   From January 2008 to December 2012, if you bought shares in companies when William Campbell joined the board, and sold them when he left, you would have a 167.1 percent return on your investment, compared to a -2.8 percent return from the S&P 500.