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Thread: DIY JBL 4344 project

  1. #16
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    This will be fun to follow!
    When faced with another JBL find, Good mech986 says , JBL Fan mech986 says

  2. #17
    Member JBLP's Avatar
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    My shed/garage. I have space, but it fills fast.....

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    I'm using 30mm MDF Medite, the white milky glue, clamps and screws (5,0 x 60).
    First secure the rectangle. Then clamp (binders) the top and bottom before drilling the holes for the screws.
    Took the top and bottom one by one apart for the glue and bind it back before screwing.

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    Keeps you off the street.....

  3. #18
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    Base frame

    Next step is making the base frame; makes the cabinets easier to handle/lift.
    Made a sort of mould; one for cutting the 45 dr and one to glue the parts together.
    I used 40mm furniture-plate / multiplex (left over from a solid door).

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  4. #19
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    Base frame (cont.)

    Using the mould frame gives a nice joint (not that you will see it.....)

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    The milky glue and screwed from the inside.

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    I will not laminate the bottom with veneer, but just paint it black.

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  5. #20
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    Making good progress. I like how you cut the miter joints on the base.

  6. #21
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    Quote Originally Posted by NickH View Post
    Making good progress. I like how you cut the miter joints on the base.
    I'm using a handcircle saw to cut the 45 dr. Like this a mistake (46dr or 47dr) will not be a problem.

  7. #22
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    The Baffle

    Had to adjust the baffle a little (1 to 2 mm on two sides). Now it fits.

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    Then, setting out the cut-outs. I'm still going for the original layout.
    I'm also still looking for someone who can confirm the measurements. See post #5.
    Also the foilcal. Txs.


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  8. #23
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    Two questions

    For the ports I can use a gray PVC sewage pipe: outside dia 110mm, wall th. 3.2mm and inside dia 103.6mm.
    The 2235H specification sheet indicates a 160cm2 port; so 103.6 dia makes 84.25cm2 x 2 = 168.51cm2.
    The length is indicated 28cm.
    - What does it mean: "above mentioned port is tuning this enclosure to 30Hz"?

    The 2122H will have his own enclosure inside the big enclosure.
    This one is not having a port, although it will move some air.
    - Why does this one not have a port; thus also not "tuned"?


  9. #24
    Senior Member Odd's Avatar
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    Even if you try, you will not get the same volume as the original. The ports need to be adjusted after everything is installed.
    Cut the pipes so they can be cut later.
    Read about enclosuretuning here
    2122 shall have a separate, closed box.

  10. #25
    Senior Member ratitifb's Avatar
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    Quote Originally Posted by JBLP View Post
    The 2122H will have his own enclosure inside the big enclosure.
    This one is not having a port, although it will move some air.
    For sure the 2122 will move some air and the closed box volume will act consequently like a spring, increasing the low resonant frequency of the system (adding stiffness of both elements, the driver and the closed box)
    Quote Originally Posted by JBLP View Post
    - Why does this one not have a port; thus also not "tuned"?
    The port acts as a resonator and radiates its energy at low frequency above the resonant frequency of the driver. That is not necessary to tune the box when driven by a such speaker showing a low resonant frequency compared to the low cutoff frequency of the X-over band pass.

    By the way, great craftmanship work you are doing and what a great project

  11. #26
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    Hey guys,
    Odd: So this will need to be tested when everything is in place. Did read the information, thanks.
    Ratitifb: The network band pass is between 320 and 1300 Hz for the 2122. So the resonant frequency is below 320 and thus no port. Thanks.

    Will start the cutouts soon......

  12. #27
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    The units

    This is what I collected so far:

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    2235H are 100% (from Germany),
    2123H to be reconed as 2122H (from Austria),
    2425J + Beyma horn. Two different diaphragm's. (from the Netherlands),
    2405H with not original JBL diaphragm's. Paint is in bad shape (from Germany).
    Some work to do on them.

  13. #28
    Senior Member Odd's Avatar
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    Very nice work!

    Refurbishment of 2405 info

  14. #29
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    Final layout

    This is it; final layout. Did adjust a bit; more distance between 2235 and 2122.

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    Thanks Odd; exactly what I have to do with my 2405's.
    Some good tips from Wardsweb!

  15. #30
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    Cut outs

    Next step, the cut outs, was nice to work on, they are on their way to become speakers......

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