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Reload Thread: polyfil + ported box.... help

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    polyfil + ported box.... help

    I've got a box right now (a custom built truck box) for two 10"s that's sitting at .95 cubes per sub after sub and port displacement. I need to get this number up a little closer to 1.3-1.5 cubes, and the only way I can think to do this is by using polyfil, as I have the dimensions as big as they'll go. Now, since this is a ported box, I need to know **** near the exact Vb of the box in order to properly tune it.

    My question is, how do I know how much exactly polyfil will add to my box; or, more specifically, how much polyfil to add to gain half a cubic foot of volume.

    Or, any other alternatives to making the box bigger? The ports are already partially external.



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    Re: polyfil + ported box.... help

    If you add polyfill, isnt it going to fly out of the port?




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    Re: polyfil + ported box.... help

    Quote Originally Posted by 86yota
    If you add polyfill, isnt it going to fly out of the port?

    chicken wire FTW



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    Re: polyfil + ported box.... help

    ahhhhh Good thinkin.




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    Re: polyfil + ported box.... help

    or stapled down inside the box


    any help??



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    Re: polyfil + ported box.... help

    I thought adding polyfill makes the box smaller.





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    Re: polyfil + ported box.... help

    it makes the sub "think" the box is larger



    2006 Chevrolet Silverado - Crew Cab Z71
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    Bought from: Jamaica2G, Ayrton, Prowler573, netherland24, tRiGgEr, BassBEAST88, HCCAfan, HOAX_1
    Sold to: James Bang, dkguitarist, Scoobydoo, ~Magick_Man~, BigEM, lostsoul, sephiroth619, Skip01, squeak12, CELLERBR, bvr_j_0969, OneKrazyKeebler, negativezeroz
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    Re: polyfil + ported box.... help

    Quote Originally Posted by dkc62
    I thought adding polyfill makes the box smaller.

    Quote Originally Posted by maldecido33
    it makes the sub "think" the box is smaller
    Wrong... and wrong... It makes the sub "think" the box is bigger, not much... but some.

    *EDIT*Edited your post I see.





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    Re: polyfil + ported box.... help

    All polyfill does is slow down the backwave coming off the subwoofer, so it takes longer for the soundwave too come back and hit the back of the cone, so the sub "acts" like it is a larger box

    I heard something, it may not be right but 16 ounces of polyfill= 1 cubic foot



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    Re: polyfil + ported box.... help

    Quote Originally Posted by Shyne151
    Wrong... and wrong... It makes the sub "think" the box is bigger, not much... but some.

    *EDIT*Edited your post I see.
    Clean out your pm box





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    Re: polyfil + ported box.... help

    Any (small) gain you get from the "bigger box" effect of fill will be more then negated by the damping effect of said fill, you'll actually loose peak output by at least 3db.

    If the box sounds boomy and you want better SQ then adding some fill is a suitable approach.

    If you want more output you can strike fill off the list now.




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    Re: polyfil + ported box.... help

    Quote Originally Posted by dkc62
    Clean out your pm box
    Cleared.





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