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Thread: Field Guide to the JBL 10 inch Midbass driver 2121 2122 2123

  1. #16
    Senior Member ivica's Avatar
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    Quote Originally Posted by grumpy View Post
    I would expect so, partly depending on how they are used; in a system or standalone:

    http://www.audioheritage.org/vbullet...php?29742-2123
    http://www.audioheritage.org/vbullet...p?10635-E110-8
    Many thanks, so with overlaying responses of 2123 and E-110 I get the following.
    That would be some helpful for network changes if E110 is used in to say 4343 or 4345
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  2. #17
    Senior Member ivica's Avatar
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    Quote Originally Posted by ivica View Post
    Many thanks, so with overlaying responses of 2123 and E-110 I get the following.
    That would be some helpful for network changes if E110 is used in to say 4343 or 4345
    Added 2122 response.
    But all of responses are so called 'small signal responses'. On higher power I do believe that they are
    much different.
    It would be nice if such measurements somebody can add.
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  3. #18
    Junior Member EvilFuzz's Avatar
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    Quote Originally Posted by hjames View Post

    Some folks have substituted the model 2123 driver - but its not equivalent, its more efficient (higher output levels), and has a different response curve that the earlier 2 drivers. You'd need to re-design the crossover and, frankly, its just not the same driver.
    But some folks do like it.
    Some idea: if I rewind 2123 coil with copper ribbon (with 2122 JBL specs), it will be 2122? Or cones paper and magnets is different too?
    Thanks,
    Kirill

  4. #19
    Senior Member ivica's Avatar
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    Quote Originally Posted by EvilFuzz View Post
    Some idea: if I rewind 2123 coil with copper ribbon (with 2122 JBL specs), it will be 2122? Or cones paper and magnets is different too?
    Thanks,
    Kirill
    As I remembered 2122 is 'under-hung' (shorter voice coil that pole plate thickness),
    while 2123 is 'over-hung' ( VC longer then pole plate thickness), and cone suspensions ( Vas) are different too. You can see in T/S parameters for 2122 and 2123.

    Reagrads
    Ivica

  5. #20
    Senior Member 1audiohack's Avatar
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    Does anyone know if the LE10H basket/motor assembly is the same as a 2122-2122-2123? They sure look like they are based on the pictures I can find but none show a clear side shot.

    I have never seen one. The goes into list doesn't lead me to believe they are the same but I don't know for sure when it comes to pro part numbers verses home stuff.

    Any help would be greatly appreciated.

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

  6. #21
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    2121H = 2122H = 2123H = LE10H = LE111H
    2121A = LE10A but neither equal LE111A which had a much larger AlNiCo structure resulting in an absurdly low Qts, extremely overdamped, but it actually sounded pretty nice in the original L110.

  7. #22
    Senior Member 1audiohack's Avatar
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    Thank you very kindly!

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

  8. #23
    Senior Member Flodstroem's Avatar
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    Quote Originally Posted by 4313B View Post
    2121H = 2122H = 2123H = LE10H = LE111H
    2121A = LE10A but neither equal LE111A which had a much larger AlNiCo structure resulting in an absurdly low Qts, extremely overdamped, but it actually sounded pretty nice in the original L110.
    How do you guys compare the 2012H against the the 2121, 2122 and the 2123? Better or worse? And is there any benefit to use it in the monitors?
    Flodstroem

  9. #24
    Senior Member 1audiohack's Avatar
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    I LOVE 2012's, and 2020's.

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

  10. #25
    Senior Member Flodstroem's Avatar
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    I made a search of the entire forum and I found a lot of information about the 2012H compared to the other 10 inch midrange speakers
    As an example, Guido has posted som interesting info about this 2012H speaker and the 4343 but I dont know if he ever used that driver in his monitors?
    http://www.audioheritage.org/vbullet...tance+of+2012H
    Flodstroem

  11. #26
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    2123 any good down to 100hz ?

    Has anyone experience with using these over-engined and high Fs 10" drivers in satellites down to 100 hz ?

    JBL has done this on the little 2 way box 4716A if I get it right. My idea is to then add a big subwoofer to end up with some sort of a triphonic system.
    Cayin CD, CrownSR1, OnkenW(CiarePW388),JBL2490/2392,JBL2445J or McCauley9620/ custom horn, passive Xover

  12. #27
    Senior Member Ian Mackenzie's Avatar
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    This was discussed quite some time ago

    As l recall the Xmas of the 2123 in a sealed enclosure for this application will be a limiting factor but you could port/vent the enclosure.


    Plug the 2123 into a simulator and see if it will be viable?

    The 2118 maybe a better candidate.

  13. #28
    Senior Member pos's Avatar
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    Quote Originally Posted by Ian Mackenzie View Post
    As l recall the Xmas of the 2123 in a sealed enclosure for this application will be a limiting factor


    The 2012 could be a good condidate as it has a much higher xmax

  14. #29
    Senior Member bldozier's Avatar
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    Jbl thermometer, great thread. Ty.

  15. #30
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    Quote Originally Posted by 1audiohack View Post
    I LOVE 2012's, and 2020's.

    Barry.
    Hi Barry
    I can't reply to your response you are out of space, need to clean up some emails. I am interested in the pair of 2121 cones
    thanks
    todd

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