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Thread: JBL 4344 Clones

  1. #1
    Senior Member christo's Avatar
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    JBL 4344 Clones

    Here some picture of the JBL 4344s I recently finished.

    Id like to start by thanking all the DIYs who post in this forum as without your contributions my project would not have been possible!

    Components 2235, 2123, 2426H, 2405, DIY charged couple cross-overs.

    I used the plans from Ayaboh fabulous saved many hours/days/weeks of planning. I did not really deviate from them.

    Wood used 1 MDF for all panels 3/4 in Baltic birch for the baffle, 5/8 Baltic birch for the 2123 dog box and panel bracing, walnut veneer and trim. Stainless Steel for the LPAD focial, 2405 mounting plate and 2308 lens. White birch veneer stained black for the baffle.
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    Senior Member christo's Avatar
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    Everyone like tools, heres the machine I used for the project members from down under may recognize it. I bought it back in the late 80s for my last speaker project. Its as accurate as any real saw/router table and folds down and can be put away for those of us that cant dedicate space to a permanent workshop. Drawback is that no third party jigs will fit; you have to make your own. The extension table is wonderful as ripping a 4x8 is easy. Well it was when I was younger for this project I went to my local RONA and had all the pieces cut close to the size and then made all the final cuts at home my version of quality control. Beside do you know how much a 1 4x8 of MDF weights?
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  3. #3
    Senior Member christo's Avatar
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    The dog box ready to be assembled.
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  4. #4
    Senior Member christo's Avatar
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    On the back panel I inserted dowels where the screws for the Speakon connector and the battery box will be located.
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  5. #5
    Senior Member christo's Avatar
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    I clamped the back access panel frame pieces in to place to get the correct fit.
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  6. #6
    Senior Member christo's Avatar
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    I disassembled the mock up without disturbing the frame pieces and then drilled the dowel holes through the frame and in to the panels. Somewhat unorthodox but it was late in the fall and I was in a hurry.
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  7. #7
    Senior Member martin2395's Avatar
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    Lovely!
    It's only a pity that people use that ugly unit layout
    I went with the 4343 just because of that, the other ones were giving me a slight OCD attack.

  8. #8
    Senior Member christo's Avatar
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    Not sure why I was in a hurry as I stalled over the winter doing the cross overs. I have no experience with building crossovers and muddled my way through it. So I started with mock ups (left) and progressed to final version (right).

    Much thanks to Chas who provided much guidance with the cross overs!
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    Senior Member christo's Avatar
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    This is an easy way to get the lacquer off the coils. Let the wire sit in the furniture stripper (water based) 15 to 25 minutes depending upon how thick the lacquer is and then brush it off with a brass bristle brush. Worked great!
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  10. #10
    Senior Member christo's Avatar
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    I stacked the 2123 xover on top of the 2405 and 2426 circuits.
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  11. #11
    Senior Member christo's Avatar
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    First pass at testing the circuits
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  12. #12
    Senior Member christo's Avatar
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    Second pass with all the wiring complete and ready to be installed, Note the terminal block installed on top of the dog box. I also color coded all the wiring with shrink wrap to ease the correct wiring so even if you lose the wiring diagram if you follow the color coding things will still work.
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  13. #13
    Senior Member christo's Avatar
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    Battery Box

    I used a 9 volt guitar battery box mounted on the back panel to make things easy.
    http://www.guitarpartsresource.com/electrical_other.htm

    The box itself is deeper than one inch so I had to manufacture an internal cover with connections to inside the cabinet.
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  14. #14
    Senior Member christo's Avatar
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    Here Im gluing the battery box cover on the back cabinet panel.
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  15. #15
    Senior Member christo's Avatar
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    To get the wires in to 2123 I used speaker binding posts
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