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Thread: DIY-project: JBL Kebnekaise S4365

  1. #211
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    If the driver is bad, but the membrane is ok, could I then fit my beryllium membranes into 045Ti drivers?

  2. #212
    Senior Member pos's Avatar
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    Have you tried swapping diaphragms and cores?
    How do the harmonic and intermodulation distortion measurements look?

  3. #213
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    It looks exactly as a not well centered JBL diaphragm. On the measurements you should also see distorsion in the problematic frequency area.

    My experience in changing 2" JBL diaphragms (I experienced similar frequency responses problems) is that it was very sensitive in terms of centering them.
    Use a generator and a mike, focussing in the frequency range not only the ear (except if you're a golden ear), try small movements or other fixing positions. This might be a bit stressing with Be I recognise.
    as you have a reference unit working well you can also use impedance measurements trying to match the correct unit.

  4. #214
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    The right one is my bad membrane compared to a new one (another model).
    This is after extensive cleaning. Looks like shit.
    They tell me the core is OK, but the membrane is not OK.
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  5. #215
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    Measurements from today comparing my drivers.
    I am worried about my left 476Mg as well. Too high distortion?
    (1m to mic. In middle of room with 3 cycles FDW)
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  6. #216
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    continued...
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  7. #217
    Member alpina's Avatar
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    Very beautiful. My congratulations

  8. #218
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    Off-axis measurements.

    NB, there is a -9dB autoformer on UHF (because I will use the THX AAA headphone amp later).
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  9. #219
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    Pics from measuring yesterday.
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  10. #220
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    A distinguished member of this forum noticed that it is a 4” membrane on the picture. The service guy has worked in the wrong driver, it is confirmed now.

  11. #221
    Senior Member martin_wu99's Avatar
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    So beautiful,great job!but why not Kebnekaise S4367? i like 4367
    46 lover

  12. #222
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    Quote Originally Posted by martin_wu99 View Post
    So beautiful,great job!but why not Kebnekaise S4367? i like 4367
    It was 4365-parts I had the opportunity to buy.

  13. #223
    Senior Member martin_wu99's Avatar
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    Quote Originally Posted by bubbleboy76 View Post
    It was 4365-parts I had the opportunity to buy.
    I can't believe that you have made it , are you a carpenter?
    46 lover

  14. #224
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    Quote Originally Posted by martin_wu99 View Post
    I can't believe that you have made it , are you a carpenter?
    A carpenter made the boxes for me, but it is my own design.

  15. #225
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    Sweet music is playing.
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