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    ws140's Avatar
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    ported box

    I am making a 2ft^3 box with a 2.5x12.5 port 13.5 inches long what frequence is that?



    Alpine CDA-9813
    Infinity Kappa 60.5s Component Speakers
    U.S. Acoutics 2080x for the comps (80x2 @ 4 ohms)
    1 ed e12O.44 in a 2ft.^3 sealed box.
    Soundstream RUB500-1 for the sub (400x1 @ 2 ohms)




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    paikiah's Avatar
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    Based on my findings on WinISD pro usng a single shiva 2...

    roughly 48Hz... SPL number, I'd imagine.



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    ws140's Avatar
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    nice that is what I am building for my kicker comp subs. How could I lower it down to 33 hz?



    Alpine CDA-9813
    Infinity Kappa 60.5s Component Speakers
    U.S. Acoutics 2080x for the comps (80x2 @ 4 ohms)
    1 ed e12O.44 in a 2ft.^3 sealed box.
    Soundstream RUB500-1 for the sub (400x1 @ 2 ohms)

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    91lacdeville's Avatar
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    make the port longer.




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    91lacdeville's Avatar
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    it would have to be 33.89 inches long. And is that volume with the displacement of the sub(s)




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    ws140's Avatar
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    I am confused becuase I went to http://jlaudio.com/tutorials/ports/index.html and got 34.3 as my port frequency so is this right or not?
    Last edited by ws140; 04-24-2003 at 01:40 PM.



    Alpine CDA-9813
    Infinity Kappa 60.5s Component Speakers
    U.S. Acoutics 2080x for the comps (80x2 @ 4 ohms)
    1 ed e12O.44 in a 2ft.^3 sealed box.
    Soundstream RUB500-1 for the sub (400x1 @ 2 ohms)

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    91lacdeville's Avatar
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    Originally posted by ws140
    I am confused becuase I went to http://jlaudio.com/tutorials/ports/index.html and got 34.3 as my port frequency so is this right or not?
    well according to my winisd program it would be tuned to 48 hz.




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    Randy Savage's Avatar
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    First of all, that box is too small for them, you are looking at around probably 1.3 cubes after displacements, and this is for 2 Comp's, right?

    You need to go bigger, at least 3 cubes. If you want to stick with that size, though, you can make the port smaller, for example- make the port 2"x6"x12", that will achieve a tuning of 33 hz with 2 cubes.





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    ws140's Avatar
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    dude it is 2ft^3 for each sub after displacement. so that port is 2x6 by 12 inches long right?



    Alpine CDA-9813
    Infinity Kappa 60.5s Component Speakers
    U.S. Acoutics 2080x for the comps (80x2 @ 4 ohms)
    1 ed e12O.44 in a 2ft.^3 sealed box.
    Soundstream RUB500-1 for the sub (400x1 @ 2 ohms)

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