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Thread: New JBL waveguides, #5006812 90x50 vs PT-F95HF

  1. #46
    Member sebackman's Avatar
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    Dear all,

    The flange of the STX/F12/F15 waveguide is 113,5mm out diameter, pretty close to 4,5".

    There are two set of bolt circles:
    For the D2 with 70mm diameter and two bolt holes
    For the 2450SL, 243X, 2453 aso with 82,5mm and with 4 bolt holes.

    The bigger bolt circle for the 2451 is half of the hole outside the WG. That iswhy I did adapter plates described above. I could not get another mount strongenough to hold the driver hanging and keep centered over time.

    In my adapter drawing the thickness of the adapter is alittle less that 1mm which seem to work fine. Originally I had a thicker platebut that was not as good when measured with 2451/475Nd drivers. A 6-10mmdistance was clearly measurable as an un-even curve.
    Pictures will follow soon

    Kind regards
    //Robert
    The solution to the problem changes the problem.
    -And always remember that all of your equipment was made by the lowest bidder

  2. #47
    Member sebackman's Avatar
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    The solution to the problem changes the problem.
    -And always remember that all of your equipment was made by the lowest bidder

  3. #48
    Senior Member ivica's Avatar
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    Quote Originally Posted by sebackman View Post
    Dear all,

    The flange of the STX/F12/F15 waveguide is 113,5mm out diameter, pretty close to 4,5".

    There are two set of bolt circles:
    For the D2 with 70mm diameter and two bolt holes
    For the 2450SL, 243X, 2453 aso with 82,5mm and with 4 bolt holes.

    The bigger bolt circle for the 2451 is half of the hole outside the WG. That iswhy I did adapter plates described above. I could not get another mount strongenough to hold the driver hanging and keep centered over time.

    In my adapter drawing the thickness of the adapter is alittle less that 1mm which seem to work fine. Originally I had a thicker platebut that was not as good when measured with 2451/475Nd drivers. A 6-10mmdistance was clearly measurable as an un-even curve.
    Pictures will follow soon

    Kind regards
    //Robert
    HI Robert,

    Can You give us the positions of the holes for fixing the horn to the baffle?

    Thanks
    ivica

  4. #49
    Member sebackman's Avatar
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    Size

    Dear all,

    The waveguides are 6,5” (165mm) by 12” (305mm) outer front measurement.

    The corners are rounded with a radious of about 1,25-1,5”.

    The mounting holes are 5,5mm wide and the recess for the screw head is 9,6mm wide.

    There are two mounting holes for screws on the sides end and three on top and bottom, all in all 10 screw holes.

    On the sides the holes are 52mm in from the edge and the distance between the holes are 61mm. (52mm + 61mm + 52mm = 165mm)

    On the top and bottom the outer holes are 54,5mm in from the edge and the distance between the holes are 98mm. (54,5mm + 98mm + 98mm + 54,5mm = 305mm).

    Kind regards
    //Rob
    The solution to the problem changes the problem.
    -And always remember that all of your equipment was made by the lowest bidder

  5. #50
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    Quote Originally Posted by sebackman View Post
    Dear all,

    The waveguides are 6,5” (165mm) by 12” (305mm) outer front measurement.

    The corners are rounded with a radious of about 1,25-1,5”.

    The mounting holes are 5,5mm wide and the recess for the screw head is 9,6mm wide.

    There are two mounting holes for screws on the sides end and three on top and bottom, all in all 10 screw holes.

    On the sides the holes are 52mm in from the edge and the distance between the holes are 61mm. (52mm + 61mm + 52mm = 165mm)

    On the top and bottom the outer holes are 54,5mm in from the edge and the distance between the holes are 98mm. (54,5mm + 98mm + 98mm + 54,5mm = 305mm).

    Kind regards
    //Rob

    Hi Rob,

    Thank you very much.
    That's the information that can help a lot but still missing the rectangle dimensions that the holes are placed on.
    Can you measure that precisely?

    Mica

  6. #51
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    Hi Rob, I finally got those waveguide last year, and they do sound good. Thanks a lot.

  7. #52
    Senior Member ivica's Avatar
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    STX horn (#5006815) holes spacing

    Quote Originally Posted by sebackman View Post
    Dear all,

    The waveguides are 6,5” (165mm) by 12” (305mm) outer front measurement.
    The corners are rounded with a radious of about 1,25-1,5”.
    The mounting holes are 5,5mm wide and the recess for the screw head is 9,6mm wide.
    There are two mounting holes for screws on the sides end and three on top and bottom, all in all 10 screw holes.
    On the sides the holes are 52mm in from the edge and the distance between the holes are 61mm. (52mm + 61mm + 52mm = 165mm)
    On the top and bottom the outer holes are 54,5mm in from the edge and the distance between the holes are 98mm. (54,5mm + 98mm + 98mm + 54,5mm = 305mm).

    Kind regards
    //Rob
    Hi sebackman,

    Many thanks for the data You have sent to us, but for me these numbers are very strange, almost as are generated by the 'random generator'
    so I would expect that these date have some "expect-able inch raster data: such as:

    1. The horn overall size are: 6 8/16 inch x 12 inch

    2. Side holes are distanced from the top or bottom edges 2 1/16 inch (so the distance between the side holes are 2 6/16 inch).
    2 1/16 + 2 6/16 + 2 1/16 = 6 8/16 = 6.5 inch

    3. Upper and bottom side holes are distanced from the side edges 2 1/8 inch, and the distance between holes are 3 7/8 inch.
    2 1/8 + 3 7/8 + 3 7/8 + 2 1/8 = 10 16/8 = 12 inch

    4. I have no idea how fare the holes are from the horn outer edges but I can guess to be about 3/8 inc,
    so the distance from the upper holes row and lower holes rows to be 5 3/4 inch ( 6 2/4 - 3/8 -3/8 = 5 3/4 inch)

    5. Under such data the distance between side rows holes would be 11 1/4 inch ( 12 - 3/8 - 3/8 = 11 1/4 inch)

    6. The hole diameter , I would expect to be 7/32 inch

    All these data are just my IMAGINATION , and now I have no opportunity to check them.

    Anyhow, Rob many thanks for Your effort to help us.

    Regards
    Ivica

  8. #53
    Member sebackman's Avatar
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    Hi Ivica,

    Agreed, but those are the actual numbers comming out of the vernier caliper. Mine is in mm so I cannot read inch measures off it, but by dividing with 25,4 you should be pretty close.

    Your call.

    Kind regards
    //Rob
    The solution to the problem changes the problem.
    -And always remember that all of your equipment was made by the lowest bidder

  9. #54
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    Did you ever figure out if this is a plastic version of the PT-F95HF or a new design?

    Which is the lowest cutoff frequency for hifi?

    Mårten

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