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== Pranala luar ==
* {{commons category inline|Megaphones}}
* [http://www.prestonelectronics.com/audio/Impedance.htm Impedansi]
* [http://www.thefreelibrary.com/Controlling+public+protest%3a+First+Amendment+implications.-a016473804 ''Controlling Public Protest: First Amendment Implications''] An article about restrictions that may legally be imposed on public protests (including use of bullhorns), by Daniel L. Schofield, S.J.D., published in the November 1994 issue of the [[Federal Bureau of Investigation|FBI]]'s [[FBI Law Enforcement Bulletin|''Law Enforcement Bulletin'']].
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