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    Re: Designing a ported box with George

    *bump* for some help







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    Re: Designing a ported box with George

    what do you want to tune it to?

    =0.159*(((AV*(1.84*10^8))/((Vb*1728)*(Lv + 0.823*(Lv^0.5))))^0.5)



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    Re: Designing a ported box with George

    assuming the 18.5 and the 16.5 are internal as well....you never said what you wanted it tuned at but 15" long would be 30Hz. and the higher up you go (tuning)would only make the port shorter.



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    Re: Designing a ported box with George

    opps didnt relize i didnt say what to tune it to

    i want to tune it to 33hz sorry bout that and thanks for some help




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    Re: Designing a ported box with George

    33hz = 11.75in



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    Re: Designing a ported box with George

    could you tell me how you got that so next time i dont have to ask for help please




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    Re: Designing a ported box with George

    Av*(1.84*10^8)
    ______________ -(.823*sqrtAv)=port length
    Bv*((Fs/.159)^2)

    Av= port area(in^2) Bv=box volume( in^3) Fs=tuning frequency Sqrt=square root.



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    Re: Designing a ported box with George

    yo jelly i am guessing this is for tube ports.



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    Re: Designing a ported box with George

    thanks again

    for slot port right?




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    Re: Designing a ported box with George

    Quote Originally Posted by Thuracine187
    im gonna be making a box for my 2 12w0 in the near future. Its gonna be all 1 box with a divider so each sub will have about 2.3 cubic feet and its own port. the port legth is where i get the problem.

    my max width for the whole box is 40in and gonna be using 3/4 mdf with a divider so thats 37.75 internal width

    40 - 1.5 - .75(for divider)

    each sub

    width = 18.5
    height = 16.5

    port diameter = 5

    when i plug all the numbers into the pL formula i get like 81.3in. that seems a little big to me. so if some could tell me if that is correct and if not point me into the right direction i would really appreciate thanx.
    5" port diameter...and diameter isn't used for slots. so i just assumed he was using pvc or something...



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    Re: Designing a ported box with George

    need lenght for slot port sorry that i wasnt clear about that




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    Re: Designing a ported box with George

    tube, slot, triangle, whatever... shouldnt matter in the math. You just need port area and total port displacement.



    What the f00k happened to this place?

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    Re: Designing a ported box with George

    Quote Originally Posted by Thuracine187
    thanks again

    for slot port right?
    you didn't say slot. but a 16.5x2" slot would be 29" long still tuned @33Hz, but now with alittle over double the port area.



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    Re: Designing a ported box with George

    **** jelly what program are u using or are u doing this all in ur head.



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    Re: Designing a ported box with George

    im lost now




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