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Thread: Cabinet for JBL K-Series (....or D-Series)

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  1. #1
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    Cabinet for JBL K-Series (....or D-Series)

    Hey,


    Im the prowd owner of a pair JBL K-120 and K-140.

    Im very keen to build these ones some nice enclosures, but I have no clue of the recommended volume these drivers should get.

    They are supposed to run at home, so no big PA-abuse....



    And as well Im very unshure bout the type of enclosure; Sealed, Vented or even a Horn!?
    What does work the best in bout ~20mē at home?







    Thanks a lot for your help, I really do aprecciate it!!

    Best wishes from Germany,
    Olaf



    Ps.
    A different question; whats the difference between the "K" and the "D" Series?

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  3. #3
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    Hi,


    thanks a lot for this link.



    But they just mention the "E-Series" in this file.....

    Are they exactly comparable with the K's?



    (They suggest ~120liters für the 15" and bout 45liters for the 12"....)
    I had the K-140 running in 110liters and the K-120 in 50liters....

    Both speakers didn't seem lucky bout this size of enclosure's..... it somehow feld as if they need at least double that size.



    Has anyone made on experience?

    Best wishes,
    Olaf

  4. #4
    RIP 2011 Zilch's Avatar
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    They're not exactly the same, but close enough you wouldn't likely hear a difference. K Series is alnico, as I recall.

    They're musical instrument loudspeakers, and not well suited for home HiFi use as woofers. They won't produce extended low frequencies except in extreme alignments with limited power-handling.

    Put them in bass horns, if you'd like to try that. No extended bass there, either, but, well, fun....

  5. #5
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    Hi,

    wouldn't the Alnico-Versions sound way better than the later E-Series?



    How low do K-120 or K-140 really go?


    Is the K-120, for example, producing music down to ~100hz without soundpressure loss?
    Or is it allready getting less loud at bout 200hz!?
    (....in which enclosure?)



    How about the K-140?






    Maybe I should rethink my ideas....

    Which JBL Alnico Woofers do have great low bass response?






    Well thank you guys a lot so far!! Im happy to get more tips and hints from yous.

    Best wishes,
    Olaf

  6. #6
    clmrt
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    I was reminded recently of these documents, to be found in the library here.

    http://www.lansingheritage.org/image...75-porting.gif

  7. #7
    Dang. Amateur speakerdave's Avatar
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    Quote Originally Posted by Dr.db View Post
    Maybe I should rethink my ideas....
    [B]
    Which JBL Alnico Woofers do have great low bass response?
    Alnico JBL woofers with better low bass response than K140 in a given sized enclosure: LE15A (Alnico, underhung), or 2231A/136A with original cones or any of the D130, 136A, 2231A, 2135, family of Alnico frames with 2235H recone kits in them. LE15A's are also reconable at about $200-250 per. Alnico woofers with mysterious histories should be magnetically recharged.

    Also should mention the nearly ubiquitous Alnico LE14A, which will be the cheapest, though it usually needs to be refoamed.

    You also might consider the neodymium JBL 1400nd, of which there is a pair currently on ebay starting at $825. They have dual underhung voice coils plus a braking coil. That would be the best next to the current HTF* Alnico 1500Al.

    Then there are TAD Alnico woofers, which can be found fairly often recently on ebay in various states of useability, for $400-800 per pair. Reconing them is about $250 each, I think.

    *HTF: Hard To Find

  8. #8
    Senior Member ivica's Avatar
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    Quote Originally Posted by Zilch View Post
    They're not exactly the same, but close enough you wouldn't likely hear a difference. K Series is alnico, as I recall.

    They're musical instrument loudspeakers, and not well suited for home HiFi use as woofers. They won't produce extended low frequencies except in extreme alignments with limited power-handling.

    Put them in bass horns, if you'd like to try that. No extended bass there, either, but, well, fun....
    What is your oppinion about using K120 as Mid-bass speaker (say from 300Hz to 3000Hz)
    Ivica

  9. #9
    Senior Member jcrobso's Avatar
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    I have my D140F in "K" corner horn.

    I get good bass down to 28hz below that nothing, since the horn has cut off.
    I used the D140F because that is all I had at the time.
    I did try some 2220H in the "K" horn, but went back to the D140F because of the higher sensitivity of the D140F.

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