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    enclosure help

    i have four MA121XQ subs that I want to build a ported enclosure for. The manual recommends 3 cu ft. for one sub so am I correct in assuming that i need an enclosure with 12 cu ft ? Also it recommends 25 sq/in. port area and port length of 14 inches so does this mean i could do 1 port that has 100 sq/in of port area. i am a little confused because when i punch all of my measurements into the Torres box tuning calculator i have to use different dimensions for the port to tune to 35Hz. These are the outer dimensions that i have and will be using 3/4 mdf

    Height 23"
    width 36"
    depth 32"

    Port dimesions

    Height 20"
    Width 5"
    Lenght 9"
    This will be in a full size K5 Blazer if that matters at all . Any help you guys could give would be greatly appreciated.







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    Re: enclosure help

    This makes things much simpler RE AUDIO - Box Calculator



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    Quote Originally Posted by GeekSquad View Post
    Make the port as large and as round as possible. For example, a square port is more round than a rectangular one; an octogonal port is more round than a square port. Also, keep the number of ports down to one, if possible.

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    Re: enclosure help

    thanks i will give this one a try




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    Re: enclosure help

    I love the RE Box calculator, except in cases when I need to bend a port more than once, and then it's pen and paper and port length calculators online. Do note that you need to design the box to have a slightly lower tune than your target, as the sub's displacement, braces, 45s in the corners of the port, etc. will raise your tuning frequency by a slight margin.



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    Re: enclosure help

    Quote Originally Posted by Danometal View Post
    Do note that you need to design the box to have a slightly lower tune than your target, as the sub's displacement, braces, 45s in the corners of the port, etc. will raise your tuning frequency by a slight margin.
    This.

    The RE calc does not take these into consideration and this can throw off your tuing by 2-3hz.



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    Re: enclosure help

    Quote Originally Posted by kushy_dreams View Post
    This.

    The RE calc does not take these into consideration and this can throw off your tuing by 2-3hz.
    There is some other good news concerning RE's calculator. I've done calculations and confirmed that it actually takes end correction into consideration when projecting the total port length and subsequent tuning frequency. That impressed me for sure. Heck, I'll go ahead and say RE does everything right IMO as a subwoofer manufacturer (Well, I'm not crazy about foam surrounds, but I digress).



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    Sub Amp: Boston Acoustics GTA-1000m
    Sub: JBL P1224, 2.5 ft^3 @ 25 hz enclosure
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    Re: enclosure help

    I love re calc. But now IM using aeros more and have no idea about what length to calc them at lol



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    Re: enclosure help

    This may be a newb question but why is there such a big difference in the various calculators that you find on the net. If I put my measurements into the torres calculator it gives me a net volume of 12.42ft but the RE calculator gives me 10.37. That is of course if i am entering my measurements right.




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    Re: enclosure help

    Quote Originally Posted by deadgame1 View Post
    This may be a newb question but why is there such a big difference in the various calculators that you find on the net. If I put my measurements into the torres calculator it gives me a net volume of 12.42ft but the RE calculator gives me 10.37. That is of course if i am entering my measurements right.
    My take on this is that the torres calculator is not taking into account the driver displacement from your subs. When you only have a couple, you really cant notice it, but put four subs in a box, and all that driver volume will really add up on you.



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    Re: enclosure help

    The torres calculator gives you the option to add sub displacement to the figures. Do the port deminsions i gave above look right for tuning to 35Hz




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