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Reload Thread: Building box,have question on ports

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    tman's Avatar
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    Building box,have question on ports

    Hey guys,

    Im built a ported box for two JL10W5-D4 subs.
    The specs on the speaker are:
    Fs: 31.7Hz
    Qts: 0.384
    Qes: 0.402
    Vas: 1.60 ^3
    Xmax: 0.295

    The box im building is 18*14*14 per chamber
    IM using a Punch 800.2 to push them with about 200W to each.
    The port dimensions it calls for are 3x10.75.
    This port length seems kind of short to me for a 30-40hz tuned box?

    Am i wrong here? What should the port dimensions be for a round port?
    The box is already built so it dont have much room to play with for the length of the port.

    Thanks,

    Tman



    "Something wicked this way comes"




  2. #2
    ShaunMac's Avatar
    ShaunMac is offline Thank You Come Again!



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    Are the 18 x 14 x 14 dimensions internal?
    How many ports do you have?
    What tuning freq are you looking for?



    Pioneer 8600 - Profile Amp-Infinity Speakers - L7 Subwoofer

  3. #3
    tman's Avatar
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    The dimensions are external with one port per chamber.
    Im not looking for SPL, im more into SQ cause its for daily driving.

    Thanks,
    Tman



    "Something wicked this way comes"

  4. #4
    Trixter's Avatar
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    Assuming 3/4" MDF you have a 1.5cu' box

    According to WinISD, 1.5cu' box with a 3" diameter port tuned to 35Hz would be 8" long. If it was 10.75" long it would be tuned to 31Hz.



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    Lv = [(14630000 x R^2) / (Fb^2 x Vb)] - 1.463R
    *Vb = vol. in cu"
    **R = sq.rt. A / Pi (for square/slot port)

  5. #5
    tman's Avatar
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    Yes it is 3/4 MDF. I guess i should go with the 35Hz huh? that sounds like a nice round number.


    Thanks for the info guys!

    Tman



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  6. #6
    ShaunMac's Avatar
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    If you're more into SQ you might go with the 31Hz tuning freq.



    Pioneer 8600 - Profile Amp-Infinity Speakers - L7 Subwoofer

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    tman's Avatar
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    Ooops... that is what i meant to say!
    Thnks,

    Tman



    "Something wicked this way comes"

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