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But how do they work? What are the acoustics involved? What's the optimal shape for a megaphone? — Kieff 00:45, 13 January 2007 (UTC)

I added a few words and a pointer to an article but your questions are good ones and there is much to add. Tre1234 00:12, 7 March 2007 (UTC)

The optimal shape depends on the desired shape of the antenna - exponential is a common choice as it produces a relatively tight cone. However, there is a problem with diffraction around the edges which can lead to the classic trumpetlike sound of the megaphone. A tractrix cone avoids this, but makes a less directional beam. —Preceding unsigned comment added by (talk) 17:00, 5 October 2007 (UTC)


Perhaps it's worth mentioning that the bullhorn is used now and then by musical artists for the distortion it causes - for example, but Muse in their version of Feeling Good.

Loud Hailer[edit]

I removed the request for citation. A Google search on Loud Hailer returns 124000 pages, the first 10 of which are all megaphones. Maybe this is only a Britishism? An investigation into the term would be interesting to read but I don't think that there's any doubt as to its meaning. Tre1234 00:20, 7 March 2007 (UTC)


Britannica is known to be significantly less accurate than Wikipedia for core articles; please find at least one additional source to correlate with Britannica references. —Preceding unsigned comment added by (talk) 19:48, 3 September 2009 (UTC)

Invention of the Electric Megaphone[edit]

In the article it states that the first electric megaphone was produced in 1954, yet later on it says the electric megaphones were used at the National Republican and Democratic Conventions of 1920. Something isn't right here... — Preceding unsigned comment added by (talk) 19:24, 20 February 2012 (UTC)

Good point. Those must have been the first (stationary) public address systems, the technology at that time was nowhere near capable of building portable bullhorns. Public address systems were sometimes called "megaphones". I'll try to find some sources on that. --ChetvornoTALK 19:08, 4 April 2013 (UTC)

Megaphone Crowd Control[edit]

While law enforcement agencies and emegency management agencies use power megaphones for settling and controlling the crowd, evacuation agencies make use of megaphones in times of disaster so that instructions are made loud yet clear to the targeted audience. Event management companies, on the other hand, use them for tours, non-traditional presentations, and exhibitions. One of the best things about power mega phones is their delivery of smooth vocals that helps in passing on clear instructions to the audience, which is extremely critical for communicating the point of view of the speaker.

The fact that megaphones can be easily purchased these days by going online and at discounted pricing with express shipping means that buying power megaphones from is a company that has been selling power megaphones for years.

It is a must to be able to amplify your voice when coaching a team or controlling a crowd. Simple yelling is no solution and may even bring unrest and frustration. Therefore, law enforcement and firefighting agencies & coaches use power megaphones to perform their duties in the best possible way. A power megaphone is the best tool for tasks such as controlling a crowd or passing a message at outdoor gatherings. This is the primary reason why power mega phones are routinely used by law enforcement officials, firefighters, evacuation agencies, coaches, and event management companies. has several types of megaphones to assist in your megaphone buying experience. — Preceding unsigned comment added by Readme65 (talkcontribs) 12:45, 5 April 2013 (UTC)

Just a warning. Wikipedia does not allow the inclusion of promotional material in its pages (see WP:SPAM). If you include your website on the page it will be removed. --ChetvornoTALK 13:10, 5 April 2013 (UTC)

Where did the word 'bullhorn' come from?[edit]

The corkscrew shape of a bull's horns don't look anything like a speaking trumpet. Just curious. — Preceding unsigned comment added by (talk) 23:51, 26 July 2014 (UTC)

External links modified (January 2018)[edit]

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Nature of distortion[edit]

"The distinctive distorted sound of a human voice amplified by a megaphone is widely recognized, from its use in train and bus stations and sports arenas. Applied to music, it gives the sound of an antique acoustic gramophone record player."

It is not. I've owned several mechanical record players & know enough about the subject of distortion. The 2 produce significantly different effects. (talk) 01:11, 19 April 2018 (UTC)