Edward_Kellogg_&_Chester_Rice_with_cone_speaker_1925.jpg
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Summary
Description Edward Kellogg & Chester Rice with cone speaker 1925.jpg |
English:
The first electrodynamic cone
loudspeaker
invented in 1925 at General Electric laboratories in Schenectady, New York, with inventors
Edward W. Kellogg
and
Chester W. Rice
. Modern loudspeakers are based on this design, which combined the
moving coil
driver mechanism with a paper cone diaphragm. They are holding the driver unit; the completed speaker with its 6 inch cone, is partially visible behind them.
Kellogg and Rice invented the concept in 1921, but it took until 1925 to improve the acoustics enough to compete with existing
horn loudspeakers
. They filed for patents and announced the device in 1925. The speaker's advantage was that it had flatter frequency response than horn speakers, and could reproduce adequate bass without the enormous length of sound path required in horns. The first commercial model, the RCA Radiola Loudspeaker #104, went on sale in 1926 for $250, about $2000 in today's dollars. Information from
History and types of loudspeakers, Edison Tech Center
|
Date | |
Source | Retrieved September 24, 2014 from W. T. Meenam, "A new type of hornless loudspeaker" in Popular Radio magazine, published by Popular Radio, Inc., New York, Vol. 8, No. 2, August 1925, p. 128 on American Radio History website |
Author | W. T. Meenam |
Licensing
Public domain Public domain false false |
This work is in the
public domain
in the
United States
because it was
published
(or registered with the
U.S. Copyright Office
) before January 1, 1929.
Public domain works must be out of copyright in both the United States and in the source country of the work in order to be hosted on the Commons. If the work is not a U.S. work, the file
must
have an additional
copyright tag
indicating the copyright status in the source country.
Note: This tag should not be used for sound recordings. PD-1923 Public domain in the United States //commons.wikimedia.org/wiki/File:Edward_Kellogg_%26_Chester_Rice_with_cone_speaker_1925.jpg |