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Reload Thread: Check my numbers

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    seth350's Avatar
    seth350 is offline CarAudio.com Elite



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    Check my numbers

    Well Ive already cut all the pieces, but these numbers should be right.

    Here we go.......

    This is a ported box for my SX 15.

    As RE says, make it 3.5cuft @ 32hz

    I got these measurments 34"x13x18" and that gave me 3.56cuft net.

    I then calculated port disp. -
    Port is 32hz
    H-16.5"
    W-3"
    L-30.5"
    Take the length and subtract .75 and then multiply by the height and then multiply by the width+.75 and then divide by 1728

    Which is 1.07cuft for the port disp.

    Sub Disp is 0.18cuft.

    Now, I have my net volume, and my displacements, now I need my gross volume and I get that by adding up the net and displacements.
    Which is
    3.56+1.07+0.18=4.81cuft

    So my gross volume is 4.81 cuft.

    Now I adjusted my measurments to compensate for this.
    Which is now
    35.5"x13"x18" = 4.807, and when you do significant figures it comes out to be 4.81cuft.

    Now, all I do is build to those measurements and that will give me 3.56 net in the box when I add port and sub, correct?



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    swimfreak26's Avatar
    swimfreak26 is offline I am cool



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    Re: Check my numbers

    If those are external dimensions then the box will only have a gross volume of 3.73 ft^3

    Didn't check the port, but you should focus on the right size first. If they are internal dimensions then you're okay if I assume the port calculations were correct.



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