151:) code (220) is the last digit of the year and the 2 digits of the week manufactured, creating a 6 digit code usually imprinted on the speaker edge or the magnet housing. Thus a code of 220534 would denote a Jensen speaker manufactured in either 1945, 1955, or 1965 on the 34th week of that year. Most speaker (and other electronic component) manufacturers began adding the last 2 digits of the year in the 1970s, so the 6 digit code became a 7-digit code. In the '40's, Jensen would sometimes omit the leading zero of a single digit week, which would reduce the total number of characters to 5.
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by SICA Altoparlanti and distributed in the United States by CE Distribution. Jensen and Rola were, for a time both under common ownership (subsidiaries of the Muter Co.), and shared various design similarities. Their 8" and 15" baskets appeared to utilize the same tooling. Rola locations took over
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Jensen
Loudspeakers ceased production of their products in the early 1970s. The speakers remained heavily sought-after as replacements for amplifiers originally manufactured with Jensen speakers. Following that demand, SICA Altoparlanti began reproducing "reissues" of the Jensen speakers in 1996.
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The last character denotes the magnet/voice coil size, and directly influences the power rating. The same magnet weights (and corresponding codes) were used on multiple speaker sizes, and the power rating increases with the increasing diameter. Ceramic magnets are roughly 45% heavier than their
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These aspects together make up the speaker's model number. For example: a Jensen C8R speaker is eight inches in size, and has a 10 Oz ceramic magnet. All Jensen speakers also include a date and manufacturer's code. Jensen's source code is 220. Accompanying the company specific
30:, the company built a reputation during the 50s and 60s providing speakers used mainly in guitar and bass amplifiers. Although the American company is long out of business, "reissue" guitar speakers are currently made in
58:. The company gained popularity in its early years, rising to its peak in the mid 1940s when Jensen speakers were selected to be used in the first production of a guitar amplifier by
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In 2008, SICA Altoparlanti began producing new speaker designs under the Jensen name. These speakers and the Jensen reissues are distributed in the United States by CE Distribution.
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62:. Subsequently, Jensen speakers in the 40s, 50s, and 60s became commonly featured in major amplifier production, including amplifiers produced by Fender,
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These are listed in the order in which they were made, with the P line starting in the 1940s and the C line starting around 1960.
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N = 29.5 Oz Alnico/29 Oz
Ceramic (This is an exception-the Alnico version uses an inefficient ring magnet)
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is a company that manufactures speakers in many different models and sizes. Originally located in
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The next one or two characters denotes speaker size (8 = 8", 10 = 10" diameter and so on).
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These speakers are designed to be as close as possible to their original design.
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Jensen speakers used a model number that contained 4 to 6 characters.
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The former Jensen Radio
Manufacturing Company was founded in 1927 by
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Jensen product manufacturing when the
Chicago plant closed.
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297:Audio equipment manufacturers of the United States
99:The first character denotes the magnet type used.
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54:, the co-inventor of the first loudspeaker, in
126:Alnico equivalents that share the same code.
287:Electronics companies established in 1927
282:Manufacturing companies based in Chicago
42:amp uses two 12" Jensen C-12K speakers.
77:for home use and was a manufacturer of
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60:Fender Musical Instruments Corporation
169:"SICA Loudspeakers History of Jensen"
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292:1927 establishments in Illinois
142:R = 6.8 Oz Alnico/10 Oz Ceramic
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194:"Jensentone History of Jensen"
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139:Q = 10 Oz Alnico/15 Oz Ceramic
1:
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252:Jensen Loudspeakers homepage
70:. The company also produced
16:American loudspeaker company
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81:drivers for other brands.
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277:Loudspeaker manufacturers
262:Jensen Speakers Australia
133:K = Unknown/50 Oz Ceramic
52:Peter Laurits Jensen
302:Radio manufacturers
257:SICA Jensen History
223:Jensen Loudspeakers
219:"Jensen Date Codes"
198:Jensen Loudspeakers
20:Jensen Loudspeakers
229:on 4 November 2013
40:Fender Twin Reverb
173:SICA Loudspeakers
56:Chicago, Illinois
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92:Model numbers
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231:. Retrieved
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75:loudspeakers
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38:The current
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271:Categories
233:4 November
203:4 November
178:4 November
155:References
129:Examples:
28:Illinois
46:History
24:Chicago
108:Alnico
68:Gibson
66:, and
72:Hi-Fi
64:Ampeg
32:Italy
235:2013
205:2013
180:2013
112:C =
106:P =
149:EIA
79:OEM
273::
221:.
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171:.
26:,
237:.
207:.
182:.
147:(
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