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    Senior Member jblwolf's Avatar
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    Apr 2003
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    Michigan
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    375 questions

    Greetings to all!,
    Over the years I have acquired a few 375 drivers from the late 50's to the late 70's,and noticed some differences,

    picture1-I have this 375 that has marking on it and some of the later models do not,

    what do these markings mean?

    2-can the year of manufacture be found with the number on the diaph?

    and my last question is

    -on the earlier models, on the inside of the cap(bell)it looks like felt was used to line the cap,while on later models foam was used,why the change,was foam better than felt?,are there any differences in the overall sound using the felt vs foam?

    Wolf
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