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Thread: Question on how to mount compression driver in JBL Box

  1. #16
    Senior Member grumpy's Avatar
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    Would anyone know the center to center distance between the midrange and the tweeter in the 3-way version of this speaker.
    Can measure this evening if no one else has the answer.

  2. #17
    Member gcarlberg's Avatar
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    Saddle

    Quote Originally Posted by gwho View Post
    gcarlberg,

    Thanks for the picture! How did you cut the saddle. Was that just a jigsaw cut, router, or some other way to make that semicircle.

    Regards,
    Gary
    Hey Gary,

    I got the outside dimension from the cut sheet in the JBL Library.

    Made a rough cut with a jig saw, glued and screw the two pieces together and smoothed it out with a drum sander mounted in a drill press.

    George

  3. #18
    Senior Member grumpy's Avatar
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    Looks like 5 1/8" center to center. To get closer I'd have get out the calipers.
    I viewed the mounting hole center values on one scale to get the above value probably within ~1/16"

  4. #19
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    George thanks for the tip on making the saddle.

    Grumpy thanks for the center to center spacing.

    Best Regards,
    gwho

  5. #20
    Senior Member ivica's Avatar
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    Quote Originally Posted by gwho View Post
    One final question. I would like to add a tweeter. I would like them in-line with the woofer and midrange. Would anyone know the center to center distance between the midrange and the tweeter in the 3-way version of this speaker. I have a pair of Selenium ST200 tweeters (looks like a JBL bullet tweeter but is smaller) but would like to know how significant using a 2405 of 2402 would be with this design. I also have a pair of 2402 bullet tweeters but both need new diaphragms (and I found the price for JBL diaphragms quite high).

    Regards,
    gwho
    Hi gwho,

    As it is known 2405 has much wider horizontal dispersion then 2402.

    regards
    ivica

  6. #21
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    Ivica,

    I looked up the sheet and there is a significant difference. 140 degrees vs 40. I assume that the lens on the midrange is supposed to increase the dispersion greater to better match the 2405. I will try to find a pair of 2405 to use in my boxes.

    Thanks
    gwho

  7. #22
    Senior Member 1audiohack's Avatar
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    Late but here they are.

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    If we knew what the hell we were doing, we wouldn't call it research would we.

  8. #23
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    Thanks for the pictures 1audiohack. I guess my pegs are different. You can see the white colored pegs for the speaker cover on the picture of the open hole. I want to thank everyone for the help. I am posting a couple pictures to show what they look like (although I am not finished). I am using parts that I have on hand for the project (the woofer is a AE TD15H). I cut holes and picked up a pair of 2405H for the tweeters. I was able to put in a brace to support the 2441 driver. Name:  IMG_20170312_191621.jpg
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  9. #24
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    One odd thing about the boxes that I picked up is that the previous owner took a jig saw to the woofer opening and opened the diameter almost to the screw holes. This is why I had to go with the external mounts. Luckily the TD15h has a slightly larger diameter than a JBL 2235.

    Regards
    gwho

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