File:Bundesarchiv Bild 102-08307, Berliner Funkausstellung, Riesenlautsprecher.jpg

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Berliner Funkausstellung, Riesenlautsprecher   (Wikidata search (Cirrus search) Wikidata query (SPARQL)  Create new Wikidata item based on this file)
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UnknownUnknown
Title
Berliner Funkausstellung, Riesenlautsprecher
Original caption
For documentary purposes the German Federal Archive often retained the original image captions, which may be erroneous, biased, obsolete or politically extreme.
Interessante Kuriositäten auf der Funkausstellung am Kaiserdamm in Berlin!
Ein Riesenlautsprecher auf der Ausstellung.
Description
Information added by Wikimedia users.
English: Giant horn loudspeaker at Berlin Radio Exhibition. During most of the 1920s, radios ran on batteries, and the early vacuum tubes could not produce much audio power. So the first loudspeakers, used with the first vacuum tube radios were horn loudspeakers, because the horn was more efficient. Horns can produce 10 times (10 dB) more sound power from a given audio signal than the later cone speakers. However ordinary-size horns have a high bass cutoff frequency and so cannot reproduce bass frequencies, so they sound "tinny". This is a "high fidelity" horn speaker, large enough so it's bass cutoff is low enough to allow more natural reproduction of concert music.

Original caption: Interesting curios at the radio exhibition at the Imperial Dam in Berlin! A giant speakers on the issue.
Depicted place Berliner Funkausstellung
Date August 1929
date QS:P571,+1929-08-00T00:00:00Z/10
institution QS:P195,Q685753
Current location
Aktuelle-Bilder-Centrale, Georg Pahl (Bild 102)
Accession number
Bild 102-08307
Source

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w:en:Creative Commons
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This file is licensed under the Creative Commons Attribution-Share Alike 3.0 Germany license.
Attribution: Bundesarchiv, Bild 102-08307 / CC-BY-SA 3.0
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current16:42, 6 September 2009Thumbnail for version as of 16:42, 6 September 2009570 × 800 (43 KB)Cropbot (talk | contribs)upload cropped version, operated by User:Finavon. Summary: caption cropped
14:27, 9 December 2008Thumbnail for version as of 14:27, 9 December 2008594 × 800 (47 KB)BArchBot (talk | contribs)== {{int:filedesc}} == {{Information |Description={{BArch-description |comment= <!-- add translations and/or more description --> |biased=<!-- if the original description text is biased, write here why! --> |headline='''Berliner Funkausstellung, Riesenlau

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