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 Post subject: Jensen KM Peri Dynamic Reproducer Speaker info?
PostPosted: Jan Wed 09, 2019 5:49 pm 
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Location: York, PA
Ok, this does not fit neatly into any particular Antique Forum Index. The reason I say that is I assume this was to be used with a console radio? I believe it dates to 1938. Local lady wants to unload it on me. So anyone know what its applications were? Or any other info.


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 Post subject: Re: Jensen KM Peri Dynamic Reproducer Speaker info?
PostPosted: Jan Thu 10, 2019 12:12 am 
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If you look on the catalog sheet shown in RadioMuseum, that speaker is advertised for "general high-quality performance." It was sold with 8", 10", 12" or 15" speakers installed, so I imagine speaker size would have some influence on its value.

It's advertised on a page with mics and mic stands. The suggestion is it would have been used on-stage and in the studio. Of course, it could also have been used as a PA speaker or with a radio or phonograph.

It would make a great speaker paired with a high-end comm rcvr, like a Hallicrafters SX-28.

https://www.radiomuseum.org/r/jensen_pe ... er_km.html

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Measure it with a micrometer, mark it with chalk, cut it with a chainsaw.


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 Post subject: Re: Jensen KM Peri Dynamic Reproducer Speaker info?
PostPosted: Jan Thu 10, 2019 3:38 am 
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Thanks. Always learning new stuff thanks to this group.

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 Post subject: Re: Jensen KM Peri Dynamic Reproducer Speaker info?
PostPosted: Jan Thu 10, 2019 4:19 am 
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Why not have a pair.
https://www.ebay.com/sch/i.html?_from=R ... 6&_sacat=0

Greg.


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 Post subject: Re: Jensen KM Peri Dynamic Reproducer Speaker info?
PostPosted: Jan Thu 10, 2019 12:57 pm 
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I suspect these were used as monitoring speakers at 1940's and '50's radio stations.

Dave


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 Post subject: Re: Jensen KM Peri Dynamic Reproducer Speaker info?
PostPosted: Jan Thu 10, 2019 1:18 pm 
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Does the data plate give the impedance? I thought I saw an ad in a QST for some of those Jensens like that and some were medium impedance, not low like modern speakers.


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 Post subject: Re: Jensen KM Peri Dynamic Reproducer Speaker info?
PostPosted: Jan Thu 10, 2019 2:46 pm 
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Not in my possession. Not sure on impedance.

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 Post subject: Re: Jensen KM Peri Dynamic Reproducer Speaker info?
PostPosted: Jan Fri 11, 2019 1:51 am 
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The listing for the KM speaker in the 1939 Radio Shack catalog online, says they have line matching transformers for that speaker to match from 500-2000 ohms, and a plate transformer to match it to tubes directly. So that speaker may come with the matching transformer in it. Otherwise, I have an old prewar Jensen 6 inch PM speaker here, the matching transformer on it was bad, but the voice coll is only 3 ohms. So a solid state amp that would drive a 4 ohm load ought to be good with it as long as you stay conservative with the amount of power you pump into it. I would certainly play it at moderate levels till you can find info on max power, but I expect the max power is not very high based on the amps of the time. Otherwise any transformer that would match a 3.2 Ohm voice coil such as in alot of AA5 radios would give you a higher impedance.


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 Post subject: Re: Jensen KM Peri Dynamic Reproducer Speaker info?
PostPosted: Jan Fri 11, 2019 4:14 am 
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We had a couple of those as broadcast monitors when I was in radio. Two different sizes. As I recall the speaker impedance in ours was conventional.

-David


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 Post subject: Re: Jensen KM Peri Dynamic Reproducer Speaker info?
PostPosted: Jan Fri 11, 2019 1:54 pm 
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wazz wrote:
Does the data plate give the impedance?


The speaker cabinet for sale on ebay says 6-ohms. It probably didn't contain a transformer.

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Dave


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 Post subject: Re: Jensen KM Peri Dynamic Reproducer Speaker info?
PostPosted: Jan Fri 11, 2019 5:58 pm 
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Probably a later version than the Jensen I have and the catalog model. Remember that is 1945 or so concept of "hi-fi" with something like 78 records playing but would be curious as to how good it does sound.


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