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Thread: JBL D8R2425 Diaphragm Replacement for JBL 2426H Compression Driver

  1. #1
    Member hightechhick's Avatar
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    JBL D8R2425 Diaphragm Replacement for JBL 2426H Compression Driver

    Help.

    Does anyone know of a thread or link that describes the proceedure to replace a JBL D8R2425 diaphragm in a JBL 2426H Compression Driver?

  2. #2
    Junior Member speakerex's Avatar
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    DIAPHRAGM INSTALLATION FOR MODELS 2425, 2426, 2427, AND 2445*
    1. Fold piece of masking tape lengthwise around a cardboard digger with adhesive side
    exposed. Insert in gap and rotate to clean out debris. Continue cleaning until tape is
    clean when withdrawn. Inspect visually with magnifying light. Inspect new diaphragm for
    defects or damage. Using an air gun blow out the gap for any debris that was not visible.
    2. Remove cover gasket to expose JBL name that is stamped into the top plate. Using both
    hands, carefully position diaphragm mounting holes in alignment with top plate mounting
    holes and input terminal with polarity marking aligned with JBL name in top plate. Polarity
    marking for 8 ohms will be green, and for 16 ohms the marking will be red.
    Warning: do
    not rotate the diaphragm while the voice coil is in the gap
    . With mounting holes and
    polarity marking positioned correctly, carefully lower the diaphragm into top-plate recess.
    Be sure the base of the diaphragm mounting ring is positioned flush to the surface of the

    top-plate recess. Insert mounting screws and hand tighten.
    [email protected]

  3. #3
    Member hightechhick's Avatar
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    Question Post Diaphragm Final Test Proceedure Needed?

    Thank you for the speedy reply!

    I was an analog tech from long ago RCA. I get around on the web just fine, but this is the first discussion group I have ever joined. This seems like a friendly place with lots of knowledgeable people.

    Once the diaphragm is replaced, is there a final test procedure involving an oscillator or other test equipment?

    Thanks again,
    -HTH

  4. #4
    Junior Member speakerex's Avatar
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    yes we test all speakers both before and after the repair to be sure that they 1) need the repair and 2) measure up to the appropriate specs.

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    if there was reputation meter on this forum , I'd click like no tomorrow


  6. #6
    Junior Member speakerex's Avatar
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    Thanks

  7. #7
    Senior Member ratitifb's Avatar
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    add info

    http://audioheritage.org/vbulletin/s...ighlight=2426H

    http://audioheritage.csdco.com/vbull...ragm+Centering

    be carefull with free metal screw and screw driver so well loved by magnet strength

  8. #8
    Junior Member speakerex's Avatar
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    good point!

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