File:Large horn loudspeaker.jpg
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| Description |
English: One of the largest horn loudspeakers ever built, installed at Idora Park, California amusement park in 1922. This photo shows its presentation to the public, before it was installed. At this time, public address systems, made possible by the development of reliable vacuum tubes during WW1, were new and very low powered, and required horn speakers to get adequate volume. As a publicity stunt, Idora Park installed this large horn to play music concerts and radio programs throughout the park. Built by Magnavox at its Oakland, CA, plant, the speaker was made of spruce, 35 feet long, with a 1 inch throat widening to a 12 foot square mouth at the other end. The speaker was driven by a standard Magnavox compression driver with a metal diaphragm, powered by an tube amplifier with a then unprecedented output power of 47 watts. The huge horn amplified the sound produced by the amplifier so it could reportedly be heard throughout a 29 square mile area. |
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| Source | Downloaded August 28, 2013 from "Largest Radio Horn Installed", Electrical Record, The Gage Publishing Co., New York, Vol. 32, No. 1, July 1922, p. 8 on Google Books |
| Author | Unknown author |
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This media file is in the public domain in the United States. This applies to U.S. works where the copyright has expired, often because its first publication occurred prior to January 1, 1929, and if not then due to lack of notice or renewal. See this page for further explanation.
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This image might not be in the public domain outside of the United States; this especially applies in the countries and areas that do not apply the rule of the shorter term for US works, such as Canada, Mainland China (not Hong Kong or Macao), Germany, Mexico, and Switzerland. The creator and year of publication are essential information and must be provided. See Wikipedia:Public domain and Wikipedia:Copyrights for more details.
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 20:43, 28 August 2013 | | 1,004 × 751 (131 KB) | Chetvorno (talk | contribs) | User created page with UploadWizard |
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