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Reload Thread: How to do Two ports for 1 chamber???

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    JayDolla513's Avatar
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    How to do Two ports for 1 chamber???

    dont have much height to spare so how do u do the math to make one port into two?







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    Re: How to do Two ports for 1 chamber???

    Not really sure on that one, i rebuilt a prefab box the other day, it was a 2 12 box with port in the middle, i found it easy to just change the front plate an just put the port at one end of the box, sounded 10xx better than the fake ports they build..




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    Re: How to do Two ports for 1 chamber???

    You divide the volume of the box by the number of ports.

    for example: If you have 3 cu/ft and want to use 2 4inch ports, divide 3 by 2 to get 1.5 for volume then use that to calculate port length.



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    Re: How to do Two ports for 1 chamber???

    Quote Originally Posted by kushy_dreams View Post
    You divide the volume of the box by the number of ports.

    for example: If you have 3 cu/ft and want to use 2 4inch ports, divide 3 by 2 to get 1.5 for volume then use that to calculate port length.
    say wha?

    Just split the port in two and keep the length the same. What's the problem?

    i.e.- if you have 50sq in of port 20" long, just make (2) 25sq in ports 20" long.



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    Re: How to do Two ports for 1 chamber???

    Quote Originally Posted by TaylorFade View Post
    say wha?

    Just split the port in two and keep the length the same. What's the problem?

    i.e.- if you have 50sq in of port 20" long, just make (2) 25sq in ports 20" long.
    Taylor you gonna be in the Sport area anytime soon??? Id like to get some advice from you in person...



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    Re: How to do Two ports for 1 chamber???

    Kushy actually has the correct method.

    OP didn't mention if this is a slot port or aeroport though.
    The math is different, can't just divide in half and use same length.
    More ports = more surface area = more friction in the port, which means the tuning will be different.

    Quote Originally Posted by TaylorFade View Post
    say wha?

    Just split the port in two and keep the length the same. What's the problem?

    i.e.- if you have 50sq in of port 20" long, just make (2) 25sq in ports 20" long.




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    Re: How to do Two ports for 1 chamber???

    Quote Originally Posted by n8skow View Post
    Kushy actually has the correct method.

    OP didn't mention if this is a slot port or aeroport though.
    The math is different, can't just divide in half and use same length.
    More ports = more surface area = more friction in the port, which means the tuning will be different.
    I forgot you guys care about the difference between 31.64hz and 31.92hz.

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    Taylor you gonna be in the Sport area anytime soon??? Id like to get some advice from you in person...
    I actually might be. Lookin at another CRX up there. You can text me anytime though, man.



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    Re: How to do Two ports for 1 chamber???

    Quote Originally Posted by TaylorFade View Post
    say wha?

    Just split the port in two and keep the length the same. What's the problem?

    i.e.- if you have 50sq in of port 20" long, just make (2) 25sq in ports 20" long.
    We both have it right

    some wipe back to front, others front to back



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    Re: How to do Two ports for 1 chamber???

    ...run the numbers for yourself
    It's a more significant difference than you think.

    Quote Originally Posted by TaylorFade View Post
    I forgot you guys care about the difference between 31.64hz and 31.92hz.




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    Re: How to do Two ports for 1 chamber???

    You divide the volume of the box by the number of ports.

    for example: If you have 3 cu/ft and want to use 2 4inch ports, divide 3 by 2 to get 1.5 for volume then use that to calculate port length.


    Is this the correct math for slot ports?




  13. #11
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    Re: How to do Two ports for 1 chamber???

    slot 'and' aeros...




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