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    Zeph's Avatar
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    I think Ive done it!

    I just finished making a program for port tuning calculating, ive used jl audio's formula and im pretty sure its accurate, give it a test and lemme know how it is. ive compared it to a couple hand-done calcs and it gives same answer.

    http://mikekd0.tripod.com/id10.html



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    Re: I think Ive done it!

    I did one too a while back in Excel. See the attached file. As far as I can tell mine is right on. You can check yours against it if youd like.
    Attached Files




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    Re: I think Ive done it!

    Should be fairly self explanatory. You can figure your volume, tuning frequency, and port length if you know the other variables.




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    Re: I think Ive done it!

    well, i had the pgrm, input the av,vb, and fb. calculate them using jl audio's formula, then just output the req length.. rather easy, i did it in 2 minutes..



    92 Plymouth Colt

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    Re: I think Ive done it!

    I wrote a port length calculator program on my TI-83+




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    Re: I think Ive done it!

    Okay, no offense to anyone, but why do so many folks feel the need to re-write the same shite? Math is math. Math is just about the only surely constant thing in life... ?

    [/rant]
    Last edited by Nikuk; 11-01-2004 at 04:56 PM. Reason: shortened it.....



    What the f00k happened to this place?

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    Re: I think Ive done it!

    Zeph, that's some elite C skills right there.



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    Re: I think Ive done it!

    Program: Tuning

    : Input "Freq: ",F
    : Input "Area: ",A
    : Input "Volume: ",V
    :
    : (((.025251*A*(1.84*10^8)/(V*F^2))-(.823squarerootsignhere(A))STObuttonL
    :
    : ClrHome
    : Disp L

    ill see if i can find my TI83+ software and cable, then ill upload it if i find the stuff.




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    Re: I think Ive done it!

    question... whats the cross sectional port area ? depth of the box?

    this program will calculate the "L" part of the port correct?




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    Re: I think Ive done it!

    desired tuning frequency is F, type in the frequency you want
    the area is A, if your port is 45 square inches, you would enter 45
    Volume is box volume in cubic inches. You can type in 2*1728 for a 2 cube box if you dont wanna calculate it and it will still come out correct.


    it calculates L, which is port length needed for the tuning frequency, area, and volume you specified before.




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    Re: I think Ive done it!

    but how would you know if you wanted to make it 3inches wide or 4?

    lets say you have a box 3/4 mdf all around.

    depth of the box 15 inches (internal) would that mean the cross sectional port would be 13? assuming you are leaving 3 inches for port width?




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    Re: I think Ive done it!

    Quote Originally Posted by NjccBflo
    Okay, no offense to anyone, but why do so many folks feel the need to re-write the same shite? Math is math. Math is just about the only surely constant thing in life... ?

    [/rant]
    re-write? i was excited i got a program that didnt come up with fked up on the length, who **** in your cornflakes? Go talk **** on someone elses thread..



    92 Plymouth Colt

    Alpine 9811 deck
    Alpine 5-1/4 speakers w/ silk dome tweeters
    Planet Audio P110 10" Sub in ported box
    PPI 240 2-way amp

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    Re: I think Ive done it!




    Quote Originally Posted by Scoobydoo View Post
    Before poking fun at others at least learn to spell. I won't go into all the gammar mistakes!
    Irony?

    Quote Originally Posted by audioholic View Post
    Your sig... Im trying to figure out if you think he spelled grammar wrong. Because, he didn't. Irony indeed.

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    Re: I think Ive done it!

    how come im coming up with different numbers for the length when i use this calculator and carstereo




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    Re: I think Ive done it!

    carstereo will factor in port end correction for slot ports




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