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    truckstoy's Avatar
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    Icon32 building a box, had a few ?'s

    going to build a slopt ported box for a pair of jl audio 10w7's
    got box info off of Beerman's box caculator, just wanted to know if these #'s are good for a "SQL" box for my w7's.
    box is for a 04 4-runner i listen to all kinds of music, looking for loud, very clean bass.

    3.5 cu^ft net volume
    32 htz tuning freq.
    4.25" port width
    61.625 square inches port area
    39.75" port lenth
    40w x 16t x 23d external dimensions

    should i go smaller 3 cu^ft ?
    lower or higher tuning point

    i've built boxes before, i just want to get this one right......

    any help would be appreciated

    mike



    BJ fisher custom ported box
    built for a 13w7, 05-10 mustang
    for sale!!!!!!


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    PowerNaudio's Avatar
    PowerNaudio is offline the power of audio



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    Re: building a box, had a few ?'s

    assuming you are using 3/4" mdf board.

    enclosure dimensions:
    external dimensions= W:40" x H:16" x D:23"
    internal dimensions = W:38.5" x H:14.5" x D:21.5" = 6.955cu ft internal volume

    port dimensions:
    port internal dimensions: H:14.5" x W:4.25" x L:40.39" port values used for calculating port tuning
    port physical dimensions: H:14.5" x W:5" x L:39" = 1.636cu ft external volume " assuming your only adding one wall for the port and using 3 current wall of the enclosure" this value is use for port displacement inside the enclosure.


    sub woofer displacement= .09cu ft x 2 subs = .18cu ft

    not calculating bracing.


    6.965cu ft enclosure internal volume
    1.636cu ft port external dimensions that actually sit inside the enclosure.
    .18cu ft total of both subwoofers displacement
    -
    -------------
    5.149cu ft final volume of the enclosure
    2.5745cu ft volume seen per sub.

    a 5.149 enclosure with port internal dimensions: H:14.5" x W:4.25" x L:40.39"
    will tune the box to, 26.18Hz F3:22.30Hz, freq cutoff:25Hz, with your peak being at
    [email protected]

    no apparent port noise at 1000wrms.

    that will be an SQ enclosure. since the freq response is pretty flat from 27Hz to 120Hz




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