Los Angeles Times, Dec 2, 2011

choi

(1) WJ Hennigan, Police Are All Ears When It Comes to Sound Cannons.
http://www.latimes.com/business/la-fi-sound-cannon-20111202,0,4874892.story

Note:
(a) Junkers Ju 87
http://en.wikipedia.org/wiki/Junkers_Ju_87
(or Stuka (from STUrzKAmpfflugzeug, "dive bomber"); was a two-man (pilot and rear gunner) German ground-attack aircraft; 1936-1945; Manufacturer  Junkers [founded in Dessau, Germany in 1895 by Hugo Junkers)
(b) Maroon (people)
http://en.wikipedia.org/wiki/Maroon_(people)
(The same designation has also become a derivation for the verb marooning)

In www.m-w.com, its first known use in this sense is 1666, and its first known use as the verb, "circa 1709."
(c) The Abeng.
http://www.anngel.com/ACIJ/history-abeng.htm
("The horn is blown by putting the lips to a hole in the concave side and working the thumb over a small hole in the tip to produce variations in tone. The horn - blower would inform the others, for instance, about the direction of approach of the British and how they were armed.")

(2) Brady MacDonald, Top 20 for 2012: Best New Rides at Theme Parks Around the World. http://www.latimes.com/travel/de ... arks-world-12201102,0,7404270.story
(two in Chinese mainland and one in Hong Kong)