فایل:Lansing Iconic multicell horn speaker 1937.jpg
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Lansing_Iconic_multicell_horn_speaker_1937.jpg (۳۳۵ × ۴۶۰ پیکسل, فایل اؤلچوسو: ۵۲ کیلوبایت, MIME نوعو: image/jpeg)
قیساسی
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English: The Lansing Iconic high fidelity loudspeaker from 1937 incorporating its model 808 multicell high frequency horn (top) and model 815 cone woofer. 29 1/2 in. high, 25 1/2 in. wide, 19 1/2 in. deep. It retailed for $300 (equivalent to about $4900 in 2015) and was used in studios and by wealthy audiophiles. The multicell high frequency horn on top is powered by amplifiers in the boxes behind it. The multicellular horn was invented in 1936 by Edward C. Wente of Western Electric's Electrical Research Products. (ERPI) division as a solution to the problem of high frequency dispersion. Horns were used in speakers because they could produce more sound power than cone speakers, but at high frequencies the sound was emitted in narrow beams, so listeners located off the horn's axis couldn't hear the highs. In the multicell horn, multiple small horns pointed in different directions cover the entire listening area. The form used in the Iconic, the "Shearer horn" was developed in the early 30s for theater sound systems for talking motion pictures by John Hilliard and John Blackburn at Lansing collaborating with Douglas Shearer at MGM. Information form Anthony Young "The Lansing Sound", January 27, 2003, The Freeman blog |
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| یازار | نامعلوم |
| ایجازه (فایلین تکرار ایستیفاده‌سی) |
This image is from an advertisement without a copyright notice published in a 1938 US magazine. In the United States, advertisements published in collective works (magazines and newspapers) are not covered by the copyright notice for the entire collective work. (See U.S. Copyright Office Circular 3, "Copyright Notice", page 3, "Contributions to Collective Works".) Since the advertisement was published before 1978 without a copyright notice, it falls into the public domain. |
لیسانس
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This work is in the public domain because it was published in the United States between 1929 and 1963, and although there may or may not have been a copyright notice, the copyright was not renewed. For further explanation, see Commons:Hirtle chart and the copyright renewal logs. Note that it may still be copyrighted in jurisdictions that do not apply the rule of the shorter term for US works (depending on the date of the author's death), such as Canada (70 years p.m.a.), Mainland China (50 years p.m.a., not Hong Kong or Macao), Germany (70 years p.m.a.), Mexico (100 years p.m.a.), Switzerland (70 years p.m.a.), and other countries with individual treaties.
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| تاریخ/واخت | کیچیک عکس | اؤلچولر | ایشلدن | باخیش | |
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| ایندیکی | ۳ مئی ۲۰۲۱، ساعت ۱۴:۳۴ | | ۳۳۵ در ۴۶۰ (۵۲ کیلوبایت) | Materialscientist | FFT |
| ۱۰ نوْوامبر ۲۰۱۵، ساعت ۱۲:۳۸ |  | ۳۳۵ در ۴۶۰ (۲۴ کیلوبایت) | Chetvorno | User created page with UploadWizard |
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