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Thread: is this an orginal JBL 2426H driver ????

  1. #1
    MatthiasA
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    is this an orginal JBL 2426H driver ????

    Hello i rebuilt the S2600
    now i mounted the driver on my horn!
    my first impression wasn't very well..
    is this an orginal JBL 2426h driver ?? or a unknown rebuilt?
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  2. #2
    MatthiasA
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    greetings matthias
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  3. #3
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    - Yes, that looks to be a JBL 2425 , the predecessor to the 2426 .

    - Make sure it's the 8 ohm type by measuring the DC impedance ( DCR ) with a multimeter . DCR for the 8 ohm 2425H will be in the 3.2 to 4 ohm range . If it is twice that number then you have a 16 ohm 2425J . If you have a 2425J , the impedance mismatch with your present crossover values will throw the sound of the hipass all out of whack .



  4. #4
    MatthiasA
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    its the 8 ohm version
    ok but is that the right driver for the S2600 ?

    habe you the spec sheet of both drivers? 2426h and 2425h?

    anyone from belgium sold me this driver as the 2426h!!!
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  5. #5
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    Hi Matthias,

    - Well, it's good the drivers are the correct impedance. That will save you from having to rebuild your crossovers.

    - The performance of the 2425 and the 2426 is virtually identical .

    - The changes that JBL introduced to the 2426 were just about all cosmetic. The 2426 has a removable, threaded, adapter plate / while the 2425 doesn't.

    - Here's a link to the 2426 pdf among some other JBL drivers.

    - Click this link to download the 2425 product sheet.

    - In the meantime, Bernard is correct, you must listen to the woofer in the box along with the horn before any meaningful subjective evaluations can be made.

    - I recommend against anyone opening up any compression driver if the person doing the "opening" doesn't know how to clean the gap of derbis & then recenter the diaphragm during reassembly . For instance ; It's quite easy to ruin a diaphragm by keeping those leads attached to the backcap and then lifting it out . The reason ? Those thick wires act like a third pair of hands, generally misguiding and hindering proper recentering & replacement of the coil into the gap.


  6. #6
    MatthiasA
    Guest
    thank you very much ! now its all ok !

    ive testet the woofer + the horn !
    its the same volume!

    greetings matthias

  7. #7
    ralphs99
    Guest
    That's good advice Earl.

    Do you have a procedure for cleaning the gap and re-centering the voice coil when a diapragm is removed? The question has probably been answered before so maybe someone can send a link.

    Cheers, Ralph.

  8. #8
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    Gap Cleaning & Diaphragm Centering : The question has probably been answered before so maybe someone can send a link.
    Here's a pretty decent link on the subject .

    Ralph, did you ever purchase the 275nd diaphragms that you inquired about some time ago ?


  9. #9
    ralphs99
    Guest
    Thanks for the link Earl! It's exactly what I needed to know.

    I made some enquiries here on the forum but couldn't get any inside deals on the 275nd's. I then got a price from JBL in Australia but the price was way too high. Finally I got talking to Mike at Vintage Audio Sales and we worked out a deal for some used 2426's he has available. I figured that even if I didn't like them better than the original diaphragms in my 2420's, I could always sell them again. So now I'm keenly awaiting their arrival in the post. They should be here anytime now! Then I hope to have a solution to the uneven midrange response problems I have been experiencing. I'll keep you posted when I get some results.

    Cheers, Ralph.

  10. #10
    MatthiasA
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    Hello! ive a question

    ive opened the driver and took the diaphragma out
    i took it in the hole back and close the driver - its sounds good
    is this the right methode ?
    i know i ve to work exactly but what can i do wrong by replacing?

    greetings

  11. #11
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    ive opened the driver and took the diaphragma out
    i took it in the hole back and close the driver - its sounds good
    is this the right methode ?
    - No, it was not the right method .

    - To find out about the correct installation procedures, read the posts from the thread that I posted a link to .

    - The fact that it sounds good is somewhat beside the point.

    - You just got lucky .

    i know i ve to work exactly but what can i do wrong by replacing?
    - The tolerances are extremely tight between the coil and the metal forming the gap. They can't touch . If the coil even just barely contacts the surrounding metal / the frequency repsonse curve is thrown off along with a substantial increase in distortion products .



  12. #12
    MatthiasA
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    ok i checked this ! its all ok !

  13. #13
    Senior Member Guido's Avatar
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    Quote Originally Posted by MatthiasA
    i know i ve to work exactly but what can i do wrong by replacing?
    greetings
    Matthias!

    You are crazy remove the dia without a clue!

    Next time be careful with the screwdriver. If this gets into the magnetic field you need a new dia. 150 Euro.....

  14. #14
    MatthiasA
    Guest

    Question

    Next time be careful with the screwdriver. If this gets into the magnetic field you need a new dia. 150 Euro.....
    into the magnetic field?
    you mean the dia?

    if this gets into the dia? then i need a new dia.... ?

    or how can i understand this?

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