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    jellyfish420's Avatar
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    Re: Designing a ported box with George

    Bbp6



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    Re: Designing a ported box with George

    Quote Originally Posted by Thuracine187
    im lost now
    whats up???



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    Re: Designing a ported box with George

    Quote Originally Posted by Thuracine187
    im lost now
    whats up??? where you lost



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    Re: Designing a ported box with George

    just dont see how i cant get those numbers for the length. im pretty sure im doing the formula correct




  5. #65
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    Re: Designing a ported box with George

    Quote Originally Posted by Thuracine187
    just dont see how i cant get those numbers for the length. im pretty sure im doing the formula correct
    well when you do the formula what number are you using for you port area?
    you said 5" diameter but thats not area...is that what your using?



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    Re: Designing a ported box with George

    Quote Originally Posted by jellyfish420
    Bbp6
    I don't know what I would do without it...eh, I'd probally bug the **** out of Jmac.




  7. #67
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    Re: Designing a ported box with George

    Quote Originally Posted by DBfan187
    I don't know what I would do without it...eh, I'd probally bug the **** out of Jmac.
    don't get me wrong i can do it on paper...but i'm already sitting at the computer. its just easier to push a few buttons



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    Re: Designing a ported box with George

    Quote Originally Posted by jellyfish420
    don't get me wrong i can do it on paper...but i'm already sitting at the computer. its just easier to push a few buttons
    Oh, I can too. But you'll just have to get back at me in about a month.




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    Re: Designing a ported box with George

    im using 82.5 16.5*5 maybe i should go get some paper cause im using my ti-83




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    Re: Designing a ported box with George

    come up with like 60-70 inches?



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    Re: Designing a ported box with George

    like 81




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    Re: Designing a ported box with George

    he man you got aim? it'll be easier to talk on there?



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    Re: Designing a ported box with George

    ygpm




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    Re: Designing a ported box with George

    bump for someone



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    Re: Designing a ported box with George

    im trying to design a box now with this method and I'm having trouble finding out my second wall length. I get a negative number everytime I try to do so.

    outside 16x33.5x20
    inside = 14.5x32x18.5

    Port
    14.5x3

    Fb is the tuning frequency you want: 34hz
    Vb is the internal volume of your box: 4.0cuft
    Av is your port area (height x width of the port face): 14.5*3 = 43.5 < meets minimum of 20in per sub for port area.
    Lv is port length: 18.41

    18.41 - 1.5 = physical LV(portlength) 16.91

    step 6 + 7
    16.91 - (10in + 1.5mdf) = 8.41

    (8.41 * 3 .75 )(14.5*) / 1728 = 0.26^3 displacement

    First wall 15*3.75(14.5)/1728 = 0.44^3 displacement

    .18+.18+.2199+.44 = 5.0199^3 box size, after displacement

    depth 18.5

    wall one 18.5 - 3 = 15.5
    wall two 16.91 - ( 18.5 +1.5) = -3.09 << ?

    any help? plz thanks

    does this mean i dont even need that second wall? or what im confused?
    Last edited by IshbOO; 05-02-2005 at 09:30 PM.



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