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Thread: 2440/2441 diaphragm replacement numbers

  1. #1
    JohnH
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    2440/2441 diaphragm replacement numbers

    Did JBL change their numbering for diaphragms?
    I got a hold of a couple of 2440 and 2441 compression drivers.
    The 2440s have a diaphragm #61435 dated 1987 in them.
    The 2441s have a daiphragm #61435-02 dated 1994 in them.
    These do not match current model numbers for these drivers.
    Have they changed numbering system, or are these diaphragms not of JBL manufacture. I can't find these model numbers anywhere.

  2. #2
    Senior Member
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    2441 numbers

    Hi JohnH
    I can't give you a direct answer but I suspect those numbers are just batch/production numbers / not actual part numbers. Some old (1980) shipping boxes in my collection, have the still utilized/current "D16R2441" printed on them. I have 2441 diaphragms that have the #61435 on them ( with no date indication ). The 2441 diaphragm has the embossed "diamond-pattern" looking surround. A 2440 diaphragm has a simple inverted "half-roll" surround . Of the 2440 and early year 2441 diaphragms that I have, all have 8 small metal stand-offs ( or built-in washers) underneath the outside rim, located at the 8 bolt-holes .

    regards <> Earl K

  3. #3
    Senior Member
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    pics of the different sheens

    Hi

    Here's a pic showing the differences in the metal "sheen" between aluminum and titanium. This should help you identify if your diaphragms are aluminum or titanium. Titanium is duller than aluminum .

    regards <> Earl K
    Attached Images Attached Images  

  4. #4
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    Positions swapped

    Here's a pic with the titanium on the left .
    Attached Images Attached Images  

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