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Thread: Jbl 2121 or 2122 out of ????

  1. #1
    Senior Member bldozier's Avatar
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    Jbl 2121 or 2122 out of ????

    Hello,
    Im looking for information how to construct a 2121 or 2122a
    So far ive found
    Le10a
    E110? Ferrite
    Le111a
    K110
    Is this correct.
    I wonder how the e110 will compare in sq.

    http://www.audioheritage.org/vbullet...2121-2122-2123
    http://www.audioheritage.org/vbullet...5-2121-vs-2123

  2. #2
    Senior Member 1audiohack's Avatar
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    I am not quite sure what your question is.

    The E110 basket/motor is identical to the 2121H basket, in every respect so a C8R2121 cone kit in a E110 basket becomes a proper 2121H, minus the foil cal sticker.

    Is that helpful?

    Barry.
    If we knew what the hell we were doing, we wouldn't call it research would we.

  3. #3
    Senior Member bldozier's Avatar
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    With research I see the le10 is 16ohm, not usable in place of 2121 on the 3145.
    The alnico version is what the questions pertained

    Was unsure if the e110 was in fact ferrite.

    Can you reflect if the if the k110 would be identical to the 2121 non ferrite. (A)
    Brian...

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    Senior Member 1audiohack's Avatar
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    Hi Brian;

    I am sorry to say that I don't have solid knowledge going that far back.

    I will look some this evening.

    Barry.
    If we knew what the hell we were doing, we wouldn't call it research would we.

  5. #5
    Senior Member ivica's Avatar
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    Quote Originally Posted by bldozier View Post
    With research I see the le10 is 16ohm, not usable in place of 2121 on the 3145.
    The alnico version is what the questions pertained

    Was unsure if the e110 was in fact ferrite.

    Can you reflect if the if the k110 would be identical to the 2121 non ferrite. (A)
    Brian...
    Hi bldozier,

    JBL E110 is Fe type magnet, while K110 is AlNiCo magnet. 2121 is AlNiCo magnet too, but 2121H, 2122H, 2123H are Fe-type magnet, so E110 basket can be used to recone as 2123H, 2122H...
    If you have clean e110, I would suggest you to try it with 3145 prior to do reconinig, may be you will be satisfied with the sound.
    May be covering its aluminum dist cap with cardboard one, can make it 'less metallic sounding'


    regards
    ivica

  6. #6
    Senior Member martin2395's Avatar
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    Is it even possible for a speaker to sound 'metallic' in the 300Hz-1000Hz region? Just curious.

  7. #7
    Senior Member bldozier's Avatar
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    Alright thats a rise in compatibility, so far so good.
    Maybe some knows about the
    K110s compatibility.
    Brian.

    Thanks,
    Ivica.

  8. #8
    Senior Member ivica's Avatar
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    Quote Originally Posted by bldozier View Post
    Alright thats a rise in compatibility, so far so good.
    Maybe some knows about the
    K110s compatibility.
    Brian.

    Thanks,
    Ivica.
    Hi

    K110 can be used as E110 too, but as it has AlNiCo magnet motor, the problem of it "magnet strength" can be a problem, as may be has to be re-magnetized.

    regards
    ivica

  9. #9
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    Hopefully the recone kit is still available : http://www.jblproservice.com/pdf/Goe...nto%20List.pdf

    The combination is not listed, http://www.audioheritage.org/vbullet...ne+Basket+list

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    Somewhere I remember reading that the K110 had a tighter voice coil gap than the E110 making alignment of a new recone kit in an old K series frame tricky at best.

  13. #13
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    The only 2121 replacement cones I found was at Orange County, including reconing: http://www.speakerrepair.com/page/RECNEPRC.html

    Anyone got experience with "OCS parts" cones? Half the price and probably made in US :-)

    Mårten

  14. #14
    Senior Member 1audiohack's Avatar
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    Jbl had them (C8R2121) on the shelf last month, I bought eight.

    I will check and see if they still have shelf stock if you are interested.

    Barry.
    If we knew what the hell we were doing, we wouldn't call it research would we.

  15. #15
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    Quote Originally Posted by 1audiohack View Post
    Jbl had them (C8R2121) on the shelf last month, I bought eight.

    I will check and see if they still have shelf stock if you are interested.

    Barry.
    I am interested in two, depending on price of course. PM me.

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