Internal bracing on sonotube?

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  • Gregg Loewen
    Senior Member
    • Aug 2000
    • 285

    Internal bracing on sonotube?


    Just finished cutting the end caps. Each cap will be 2 layers of 3/4 INCH MDF that will be placed internally and then capped off with a layer of 3/4 " pine board.

    I have glued the 2 internal layers together. I have not glued the pine board caps on to them yet.

    So my questions: do I need the internal bracing (2x2s) with 3 layers on each end? The caps will be fitting very tight and I will be screwing them into the sonotube with about 12-20 dry wall screws.

    Second question: how to I attach the braces? No idea on this one. I want to have a nicely finished pine cap on each end and dont want to drill through it to attach the 2x2s. It would be greatly preferable for me to attach the pine boards to the MDF caps before inserting them into the tubes.

    HELP!! I really want to get this project licked today


  • Pat
    Super Senior Member
    • Aug 2000
    • 1637

    Gregg, I don't recall your design but I can tell you that on my sub with 3 layers of 3/4" on each end, the top does vibrate a little at high output. I don't have any drivers or ports on the top, it is a solid 30" surface. If I had to do it again I probably would try to brace it a little better but it doesn't bother me enough to want to tear it apart to fix it

    Pat's Page
    Pat's Page


    • ThomasW
      Moderator Emeritus
      • Aug 2000
      • 10934

      Before you put on the decorative cap, attach a couple of 2X2s that span the distance from the top to the bottom cap.

      Also you really don't need that many screws if the fit is tight. Just put a good bead of caulk on the inside where the cap meets the tube and that will do the job. The screws only need to act as clamps while the caulk drys.


      IB subwoofer FAQ page

      "Complicated equipment and light reflectors and various other items of hardware are enough, to my mind, to prevent the birdie from coming out." ...... Henri Cartier-Bresson


      • Lexman
        Super Senior Member
        • Jun 2000
        • 1777

        I might suggest an X shaped criss cross brace on the back side of the top. Provided there are no ports or anything in the way, doubt so. This would give you a good brace for the length brac to the bottom end cap. Obviously, to clear the driver, you will have to adapt the end bracing, if you brace internally.

        These are only suggestions, having never built a sonosub, I can't say from experience.



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