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Thread: D2415k

  1. #61
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    I would definitely try metric screws. The part number definitely is in the JBL system as an 8-32 but I wouldn't put it past them to get it wrong on the drawing. Remember the M2 crossover shows a wrong value on a capacitor. Things happen, people make mistakes. It isn't like most flown equipment doesn't use metric hardware rigging. It isn't like metric isn't in the JBL plants already.

    I'd be flabbergasted if it was an obscure size like 8-36. It isn't until we get to #10 hardware that one sees UNC and UNF stuff. An Altec, they liked using 3/8 UNC AND UNF on the same stud for mounting the 288 and like drivers.

  2. #62
    Senior Member 1audiohack's Avatar
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    Quote Originally Posted by pos View Post
    I have 8-32.... Does not fit by hand past the first fraction of millimeter.
    Anything I might have overlooked?
    You're just not trying hard enough!

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

  3. #63
    Senior Member pos's Avatar
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    I got the adapters from Mac today.
    Beautiful work, kudos to him!
    I hope to be able to measure the D2415K on the small 6" PT waveguide soon, and compare it with a 2407H.
    I still need to find the correct screw (with a small head in both width and height), but measurements can be taken with the driver sitting on the floor, facing up.
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    There is still a small discontinuity here, I might try to apply some clay here during measurements to see if that changes the UHF response:
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    very little room for the screw head here, might have to use a sunken head, or maybe chop 2 or 3mm off the horn (see last picture in the following post)
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  4. #64
    Senior Member pos's Avatar
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    cont.

    full stack!
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    Should not be a problem to remove a few millimeters here using a belt sander, in order to get more room for the screw head:
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  5. #65
    Senior Member macaroonie's Avatar
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    Looks good , glad the fit at the driver exit worked out OK. You will be nip and tuck with the screw heads , on balance I think the belt sander is the way to go so cancel my suggestion of using a grinder. I would use the first thread as a guide to keep things neat and tidy. You will get some plastic burr at the edges but a sharp knife will clean that up.

    I'm looking forwards to seeing how well these wee guys measure up.

    Delighted to be of assistance POS.

  6. #66
    Senior Member ivica's Avatar
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    Quote Originally Posted by pos View Post
    cont.

    Should not be a problem to remove a few millimeters here using a belt sander, in order to get more room for the screw head:
    Hi POS,

    it would be interesting to show us F/R response and the 'dispersion' characteristics of such driver&horn combo.

    regards
    ivica

  7. #67
    Senior Member pos's Avatar
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    Quote Originally Posted by 1audiohack View Post
    Quote Originally Posted by pos View Post
    I have 8-32... Does not fit by hand past the first fraction of millimeter.
    Anything I might have overlooked?
    You're just not trying hard enough!
    I though this was a joke, but it turns out you were 100% right there

    I ordered the "official" part from speaker exchange, the one that Mac found when digging VTX exploded views.
    It did not fit by hand, just like the 8-32 I had here, but when using more force and a screw driver they did fit.
    It appears the thread was a bit tight, but once screwed/unscrewd once they do fit by hand.

    Sorry for the confusion: 8-32 UNC is the reference to use.

  8. #68
    Administrator Robh3606's Avatar
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    Could you fit an allen-key hex heads in there smaller pattern than a screw 8-32 should be easy to find.

    Rob
    "I could be arguing in my spare time"

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