enclosure building question

Discussion in 'Archived Threads 2001-2004' started by Craig Woodhall, Jul 21, 2002.

  1. Craig Woodhall

    Craig Woodhall Supporting Actor

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    Do I need much internal bracing in a 12ft3 box if I make the box out of doubled up pieces of 3/4" mdf? (box within a box all sides would be 1.5")

    Craig
     
  2. Dustin B

    Dustin B Producer

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    12ft^3 or 1.2ft^3?
    If it's not a typo and you are building a 12ft^3 box then definately.
    This one is only 7ft^3 gross internal volume and the front baffel is 3 layers of 3/4" mdf while the rest is 2 layers. Some would call it a little over built, but still.
    http://t-3.cc/users/kloneaudio/page30AS-15-1.html
     
  3. Craig Woodhall

    Craig Woodhall Supporting Actor

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    Dustin,

    Nope not a typo.. That is what I figured, just ends up making the box 200+ lbs..

    Craig
     
  4. Dustin B

    Dustin B Producer

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    Heh, 200+. Thomas says that box in the link I showed you is 300+ :p)
     
  5. Craig Woodhall

    Craig Woodhall Supporting Actor

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    that doesn't surprise me, hehe.. I think I will go doubled up with a couple doubled up dividers in the box.. This time it should be easier as im using butt joint with a brad nailer and glue, instead of screw/glue..

    Craig
     
  6. Pete Mazz

    Pete Mazz Supporting Actor

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    I wouldn't bother doubling up the braces. In fact, if you want to keep the weight down some, use plywood instead of MDF.

    Pete
     
  7. Craig Woodhall

    Craig Woodhall Supporting Actor

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    Pete,

    can you suggest some types of wood I could get from home depot that would work as doubled up braces, with prices?

    Craig
     
  8. Jack Gilvey

    Jack Gilvey Producer

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    You could try well-braced 3/4" marine grade or Baltic Birch ply. More expensive, but much lighter and as effective in a sub app. as doubled 3/4" MDF.
     
  9. Craig Woodhall

    Craig Woodhall Supporting Actor

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    Jack,

    i already got ahead of myself and bought/cut the mdf for the outside box and the inner box. I am gonna build the ouside box with MDF, then glue/brad a smaller box inside of the larger box.. Maybe instead of using MDF for the inside box and braces, I could use the ply. Do I need to spend the money on baltic/marine or could I use something cheaper but just as good as MDF?

    Craig
     
  10. Jack Gilvey

    Jack Gilvey Producer

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    Go with the doubled MDF. Heavy, but effective.
     

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