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2. Air horn - Wikipedia

   en.wikipedia.org/wiki/Air_horn

   A small portable air horn used for sporting events, boating, or safety, powered by a can of compressed gas. It is operated by pressing a button on the top. Portable air horns are also readily available packaged with a can of compressed gas as the air source.

3. 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 ...

4. Melodica - Wikipedia

   en.wikipedia.org/wiki/Melodica

   It features a musical keyboard on top, and is played by blowing air through a mouthpiece that fits into a hole in the side of the instrument. The keyboard usually covers two or three octaves. Melodicas are small, lightweight, and portable, and many are designed for children to play. They are popular in music education programs, especially in Asia.

5. List of musical instruments - Wikipedia

   en.wikipedia.org/wiki/List_of_musical_instruments

   Uses explosions to produce sound in pipes. Weak similarity to pipe organ or calliope (which run air/steam through pipes, but producing sound through the friction of air on ducts). pitched percussion: Steam calliope pipe organ: Asadullah (Meerut, India) Rijke tube: aerophone

6. Long-range acoustic device - Wikipedia

   en.wikipedia.org/wiki/Long-range_acoustic_device

   LRAD devices include hand-held devices, as well as those mounted on helicopters, motor vehicles and ships. [5] The parameter "ka", which is the wave number multiplied by the speaker radius, is often used to characterize sound source directivity. For this source, ka=19 at 2.5 kHz, and according to the LRAD data sheet, the beam angle of about 30 ...

7. Horn (acoustic) - Wikipedia

   en.wikipedia.org/wiki/Horn_(acoustic)

   A patent horn loudspeaker. Loudspeakers are often built into horn-shaped enclosures or use horns. Most often the higher-frequency elements (tweeters and midranges) use horns, sometimes with acoustic diffraction lenses to spread the sound waves in a horizontal pattern at ear-level and limit the vertical pattern. An audio driver (e.g., a speaker ...