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Thread: JBL L40 crossover schematic...

  1. #1
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    JBL L40 crossover schematic...

    A friend of mine got a ("very") second hand JBL L40 pair of speakers (despite my warning). One of the speaker terminals were broken so the speaker got to be opened... And then came (his) surprise (and explanation of the low price!). The Crossovers are all messed up (read: some kind of bad DIY work), on both speakers!
    Now we need the schematic of the original crossover for this speaker so that we can "build" a "original" x-over.
    Can somebody, please, help?

    Best regards,
    David.

    P.S.
    I'm new to this forum and this is my first post. But, i already enjoy it! Cheers!

  2. #2
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    Re: JBL L40 crossover schematic...

    Here it is
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    WOW!!!
    I am speechless... That was fast (&furious)!
    Thank you very, very much Giskard!!!

    Is there any recommendation/comment regarding the xover components and perhaps inner cabling?

    Thanx again!
    Best regards,
    David.

  4. #4
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    You're welcome. We aim to please, or at least to cause the least amount of collateral damage

    Since the introduction of the JBL Ti series I've wired inside the enclosures with Monster Cable.

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    I am very pleased and happy especially since no collateral damage is done!

    I've got some Monster XP speaker cable... I guess that will do.

    You guys are awesome!

    Cheers!

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    Hello again, Giskard!

    I'm sorry to bother you again, but there's been a missunderstanding or to be more precise i didn't give you the right info. I didn't know that there are 2 (even more?) versions of the JBL L40! So i need the schematic for the (european) version of the L40 (three way speaker, no tweeter attenuation, around year 1995 model). Here's what the catalogue says (if that will help):

    Drive unit complement:
    - Woofer: 708G. 200mm driver with 50mm edgewound voice coil
    - Midrange: 704G. 130mm polypropylene driver with 25mm voice coil
    - Tweeter: 050Ti-1. 25mmtitanium dome with integral diamond surround

    Crossover Frequencies:
    - 350Hz/2.5kHz

    Dimensions, mm (HxWxD):
    - 650x300x330

    Cheers,
    David.
    Last edited by D@VID; 09-11-2003 at 02:44 AM.

  7. #7
    Administrator Robh3606's Avatar
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    Well this is the closest I could find. It should at least point you in the right direction. 2 of the 3 drivers match and the crossover points are close. Good Luck


    Rob
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    Last edited by Robh3606; 09-11-2003 at 09:14 AM.

  8. #8
    Webmaster Don McRitchie's Avatar
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    I believe this is what you are looking for:
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    Regards

    Don McRitchie

  9. #9
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    Did you get this sent to you from Service?
    What was the original pdf name?

  10. #10
    Webmaster Don McRitchie's Avatar
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    I ripped it off the Harman Consumer site during the brief time that the tech sheet directory had public access. It was in a subdirectory called "International". I pulled off a copy of every file there. The file in question is named L40ts.pdf.
    Regards

    Don McRitchie

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    Hello Don,
    Thank you very, very much!!!
    By the way: this is a very informative and helpfull forum. And interesting too!
    This world would be a much poorer (have i written it right?) place without you!
    May you have happy listening sessions.

    Thanx!!!

    Best regards,
    David.

  12. #12
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    Ah! We no longer have access to the "International" stuff and I didn't bother to pull that directory off when the site was unsecured

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    Luckily someone did!

    Cheers!

  14. #14
    Senior Member GordonW's Avatar
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    Isn't there an L40T3 in the US, that's basically the same thing as this? I ask, as I think I KNOW someone who has a pair of these...

    Regards,
    Gordon.

  15. #15
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    Originally posted by GordonW
    Isn't there an L40T3 in the US, that's basically the same thing as this? I ask, as I think I KNOW someone who has a pair of these...

    Regards,
    Gordon.
    Yes there is an L40t3 in the U.S.
    Here's the schematic to that model
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