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Reload Thread: Combining ports.....

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    Icon32 Combining ports.....

    Alright im looking at building a new box for my type x's. I have one in a 2.4 cube @ 32hz box, but it provides to high a SPL peak and to steep a slope for response curve, so i decided to go with alpines specs. The specs are for a single sub but i want a single chamber dual sub box. The recommended vent area for a single sub is 19.5"^2, with a length of 27 inches. To add another sub do i keep the length the same and double the port area?







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    Re: Combining ports.....

    Yeap, that's about it, make sure to account for driver displacement.




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    Re: Combining ports.....

    Quote Originally Posted by Demi View Post
    Alright im looking at building a new box for my type x's. I have one in a 2.4 cube @ 32hz box, but it provides to high a SPL peak and to steep a slope for response curve, so i decided to go with alpines specs. The specs are for a single sub but i want a single chamber dual sub box. The recommended vent area for a single sub is 19.5"^2, with a length of 27 inches. To add another sub do i keep the length the same and double the port area?
    no, thats not quite how it works. the larger the port area, the longer the port has to be to maintain the same tuning





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    Re: Combining ports.....

    Quote Originally Posted by rpfuror View Post
    Yeap, that's about it, make sure to account for driver displacement.
    please stop





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    Re: Combining ports.....

    Quote Originally Posted by jeepintn View Post
    no, thats not quite how it works. the larger the port area, the longer the port has to be to maintain the same tuning
    Aww crap thats right. Grrr. I guess it would be easier to do a multi chambered box. I will see when i get home, i have the formula for port length at the house.




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    Re: Combining ports.....

    A larger port area directly corresponds to more dB's or is that not true?



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    Re: Combining ports.....

    general rule for port aera is 15 square inches for each cubic foot of air space



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    Re: Combining ports.....

    Quote Originally Posted by jeepintn View Post
    no, thats not quite how it works. the larger the port area, the longer the port has to be to maintain the same tuning
    I guess I mis read, but now coming back to the forum there is alot that is needed. If you increase the volume of the port you will decrease the net volume the driver sees so you will have to increase the total size of the box to maintain the correct net volume. This will inturn change the amount of lenght you will need to maintain the desired freq.

    Quote Originally Posted by jeepintn View Post
    please stop
    What was I suppost to stop?



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