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    Finding port wall lengths

    Having a little trouble with this.

    Ok i know my physical pL is 20in and my depth is 18.5(internal)

    First wall = Depth - port width 18.5 - 2 = 16.5 in

    Second Wall = Physical pL - (internal depth + 1.5) 20-(18.5+1.5) = 0

    thats the part where i get confused

    does that mean i dont have to make a second wall or what cause im not sure

    *edit* i change the physical pL to 20 b/c that would be closer to the 33hz i want

    Fb = 0.159*Sqrt[35*1.84*10^8/(5989.375(20+0.823*Sqrt(35)))]
    Fb = 33.06136067
    Last edited by Thuracine187; 11-30-2004 at 11:09 PM.







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    Re: Finding port wall lengths

    *Bump* for the edit




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    Re: Finding port wall lengths

    one answer i can give u is that. yeah u will have 2 walls:

    one that runs parrelle to the side wall
    and
    one that runs parrell to the back wall

    if u need pics i can post them.


    (sorry about the spelling)



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    Re: Finding port wall lengths

    So if my first wall is 16.5 in but in reality it would be 18in in pL

    16.5 + .75 + .75 = 18

    so i would need a second wall of 2in to get my 20in pyhsical pL

    could some1 tell me if that is correct




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    Re: Finding port wall lengths

    see that part i do not kno but i can point u in the right direction

    http://www.caraudio.com/vb/showthread.php?t=75259



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    Re: Finding port wall lengths

    so if i measure down the middle

    16.5+.75+.75+1 = 19

    so 19 would be the Pl with the first wall in

    making the second wall 1in would give me the 20 pL

    now that i think i have its time to draw out a diagram of the box




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    Re: Finding port wall lengths

    Like i said before i do not kno but here is one that will help

    http--www.audiobahninc.com-tech-Calculators-PortLengthCalc.htm.



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    Re: Finding port wall lengths

    been messing around with autocad 2005 and with the first wall 16.5in that should give me my 20in physical pL

    16.5(port wall) + 1 + 1 +1.5(mdf)




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    Re: Finding port wall lengths

    http://www.audiobahninc.com/frame2004.html

    ^^^^^^^^ check that out........



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