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    seth350's Avatar
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    [How To] Design a ported box

    Now for the other part of my write up....

    Slot Ported Boxes

    Ported boxes are similar to sealed boxes in the way you calculate the airspace.
    You still start out finding out how much cuft you need and then going from there.

    Lets begin.....

    Lets say your sub needs 3.5cuft ported and you want it ported at 33hz.

    You first begin by finding what measurments will give you 3.5cuft.
    To calculate for cuft, read my other article for instructions on how to do it.
    http://forums.caraudio.com/vb/showthread.php?t=128157

    WxHxD
    34"x18"x13" = 3.56cuft Close enough!

    Ok you have your dimensions, and your net volume now time for the port.

    I recommend using a program like WinISD for this. Its quick and easy to do.
    Punch in the parameters and we get this....

    WxHxL
    3"x18"x30.5" = 33.66hz

    Now you have decided on how big of a port you want. Now its time to calculate its displacment.

    #1 What you do is you take the length (30.5") and substract .75 from it. = 29.75
    #2 Then you multiply that by your height (29.75x18=535.5)
    #3 Then take your width (3") and add .75 it (3.75) then multiply by what you got in step #2.(535.5x3.75=2008.125)
    #4 Now take the number you got from #3 and divide it by 1,728 (2008.125/1,728=1.162109375) then do significant figures and you get 1.16cuft.

    Now you have your port displacment and now you need your sub disp.
    Lets say your sub needs .18cuft displacment.

    Ok now here is what you do.

    Take you net volume (3.56cuft) and add your port disp. (1.16cuft) and add your sub disp. (.18cuft) together and you get your gross volume which is 4.90cuft.

    Now, you have to make adjustments to your dimensions in order to get 3.56cuft after you add the port and sub.
    So now you take the measurments you started out with and adjust the height and width until you get 4.90cuft.
    Which you should end up with 36.75"x18"x16" and that gives you 4.88053cuft and then do significant figures and you get 4.90cuft.
    You dont change the height b/c then it would mess with the disp of the port and also cause it to change the tuning and it gets confusing from there. So do not change the height when adjusting your measurments
    Now you build the box to those dimensions, not the dimensions you started out with.
    You use the new measurments because then when you put in the port and the sub you have 3.56cuft left for the sub. Which is what it called for!
    Now you have designed your own box and its done right! Hopefully........


    Hope this helped out the noobs, and anyone else who needed it.
    Last edited by seth350; 11-27-2005 at 08:30 PM.



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    Re: [How To] Design a ported box




    great mini tutorial!



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    Re: [How To] Design a ported box






    Quote Originally Posted by Devillain00
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    Re: [How To] Design a ported box

    Yeah but mine is more simplified I think and not as intimidating to noobs as that one is.

    Oh well, guess it was all a waste then.



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    Re: [How To] Design a ported box

    what happens say if you're making a 1 chambered box for 2 subs, with 1 port, does the port stay the same size, or does it need to be doubled?



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    Re: [How To] Design a ported box

    Quote Originally Posted by seth350
    Yeah but mine is more simplified I think and not as intimidating to noobs as that one is.

    Oh well, guess it was all a waste then.
    but this may help all the noobs to lazy to search lol, at least for a few minutes



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    Re: [How To] Design a ported box

    Quote Originally Posted by PepsiFiend69
    what happens say if you're making a 1 chambered box for 2 subs, with 1 port, does the port stay the same size, or does it need to be doubled?

    Your port wont change, however you will need to compensate for both of the subs displacment.

    So when getting your gross volume, add your net volume and your port displacement and both of your subs displacment and you will get your gross volume.

    That volume is how much you need in order to have the needed amount for both of the subs.
    You then would adjust your width and depth until you get that amount. Then build to those measurments.



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    Re: [How To] Design a ported box

    thanks!



    Quote Originally Posted by mcsoul View Post
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    Re: [How To] Design a ported box

    Quote Originally Posted by bimma85
    but this may help all the noobs to lazy to search lol, at least for a few minutes
    Unless a mod stickys it......which is what Im hoping.
    Make it really easy then for all of us.



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    Re: [How To] Design a ported box

    Quote Originally Posted by PepsiFiend69
    thanks!
    Anytime



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    Re: [How To] Design a ported box

    seth350: thats a great way to explain displacements and enclosure calculations
    but you should add how to fold a slotport.

    could you explain it to this image in on you own words. plz


    http://tinypic.com/hvcdac.jpg




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    Re: [How To] Design a ported box

    Thats a really good diagram.

    Basically, you can't get your port length by cutting port two walls and having their lengths equalling 40" long.

    Instead you have to find the center point of the port and measure out 40" from the front to the center point and from the center point to the end.
    Then you build your walls accordingly.

    The diagram gives a great example on how to do that.



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    Re: [How To] Design a ported box

    I don't think it was a waste, bu i do think atleast 1 of these threads should be given STICKY status



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    Re: [How To] Design a ported box

    Quote Originally Posted by seth350
    Thats a really good diagram.

    Basically, you can't get your port length by cutting port two walls and having their lengths equalling 40" long.

    Instead you have to find the center point of the port and measure out 40" from the front to the center point and from the center point to the end.
    Then you build your walls accordingly.

    The diagram gives a great example on how to do that.
    thanks for the compliment on the drawing, i tried to cover what you where explaining and added a little using a drawing.

    yeah we need a sticky on how to do all the calculations for a ported enclosure.
    that way the same questions wont get asked over and over.




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    Re: [How To] Design a ported box

    i try lol




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