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    hdave's Avatar
    hdave is offline CarAudio.com Elite



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    polyfill question

    hello, i made my first sealed box ever (made a few ported ones before though)
    anyways, the INTERNAL dimensions are 13.5 x 34.5 x 4, so its about 1.07 cubic ft

    i was just wondering, how much polyfill should i put in it?

    this is for an oz matrix elite 12 dual 4, powered by an arc kar 1000.2t @ 2 ohms (approx 900 rms)

    i listen to mostly rap, a bit of reggae, and hardly anything else



    2005 Civic SE

    H/U:
    Pioneer DEH-P80MP
    Front: Stock
    Rear: Stock
    Amp: Arc Audio Kar 1000.2T
    Subs: Oz Matrix Elite 12 Dual 4
    Box: 1.07 cu.ft sealed




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    hofulstrof's Avatar
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    Re: polyfill question

    none? by adding about 1.5lbs per cf it will make the sub see a box which is about 25% bigger




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    Re: polyfill question

    wait... its only 4 inches deep?

    or am i missing something here....




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    Re: polyfill question

    could be mounting the subs inverted seeings as his subs need a mounting depth of over 7"




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    Re: polyfill question

    inverted, isn't 4 inches deep still really small? or do some people have enclosures that small





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    Re: polyfill question

    aparently hdave does pics?




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    Re: polyfill question

    ahh, im still waking up... =(




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    hdave's Avatar
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    Re: polyfill question

    ill post pics tomorrow.
    yep inverse mounted

    the sub is like 8" long itself



    2005 Civic SE

    H/U:
    Pioneer DEH-P80MP
    Front: Stock
    Rear: Stock
    Amp: Arc Audio Kar 1000.2T
    Subs: Oz Matrix Elite 12 Dual 4
    Box: 1.07 cu.ft sealed

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    hdave's Avatar
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    Re: polyfill question

    1. how much polyfill should i use?
    2. where do i get polyfill from?


    okay here are a couple pics of the box (1.07 cu.ft sealed)
    the sub will be inverse mounted (oz matrix elite 12)
    and a pic of the amp powering it (arc kar 1000.2t)









    2005 Civic SE

    H/U:
    Pioneer DEH-P80MP
    Front: Stock
    Rear: Stock
    Amp: Arc Audio Kar 1000.2T
    Subs: Oz Matrix Elite 12 Dual 4
    Box: 1.07 cu.ft sealed

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    Re: polyfill question

    looking good man. you should be able to find polyfill at the closest wallmart. is in not the same stuff they use in cheap pillows? and as for how much it depends on how much larger you want your box to seem




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    Re: polyfill question

    im not exactly sure.. i listen to mostly rap and some reggae, and usually not much more than that

    what amount of polyphill do u guys suggest?



    2005 Civic SE

    H/U:
    Pioneer DEH-P80MP
    Front: Stock
    Rear: Stock
    Amp: Arc Audio Kar 1000.2T
    Subs: Oz Matrix Elite 12 Dual 4
    Box: 1.07 cu.ft sealed

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    Re: polyfill question

    I dont know a rule of thumb off the top of my head but 1 lb is what I've heard people suggest....dunno if that will work for your good though...



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    Re: polyfill question

    1 pound per cubic foot is what Ultimate Electronics told me...but if ur inverting the subs i dont know if u need it or not



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    Re: polyfill question

    There is no right or wrong answer here.

    A properly sized enclosure shouldn't need any polyfill at all.

    Other than that, play around with the amount of polyfill and see if you like/don't like the changes in sound. Keep in mind the changes will be small, so don't expect huge dramatic changes.

    Buy a couple pounds of the pillow stuffing at Walmart. Start with no polyfill and listen. Try putting in 1lbs and listen again. Try adding .5lbs more and listen again. If you don't like it, take some or all of it back out.




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    Re: polyfill question

    thanks a lot

    what sealed volume would you guys reccomend for this sub?



    2005 Civic SE

    H/U:
    Pioneer DEH-P80MP
    Front: Stock
    Rear: Stock
    Amp: Arc Audio Kar 1000.2T
    Subs: Oz Matrix Elite 12 Dual 4
    Box: 1.07 cu.ft sealed

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