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Is there such a thing as too much poly fill?

Discussion in 'Audio & Video' started by amthree, May 20, 2011.

  1. May 20, 2011 at 6:43 PM
    #1
    amthree

    amthree [OP] Active Member

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    I have an 8" JBL GTO804 in a sealed box. I put some fill in it but as I was filling it up i kept asking myself if I should stop or is this enough. So I thought id ask you guys.

    Is there such a thing as too much polyfill?
     
  2. May 20, 2011 at 6:52 PM
    #2
    t4daddy

    t4daddy Well-Known Member

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    There is an optimum amount, a certain percent of total volume of the enclosure. Just can't recall the percentage off the top of my head.
     
  3. May 20, 2011 at 7:23 PM
    #3
    lbridges

    lbridges Well-Known Member

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    For an enclosure of less than about 3 cubic feet one should use about 1.5 pounds of polyfill per cubic foot of subwoofer box. 1/2 cu-ft box=0.75 lbs polyfill, 2 cu-ft box=3 lbs polyfill, etc.

    Those those wondering "why" to do this, it makes the box "appear" to the woofer as about 30% larger than it physically is. In other words, if your woofer wants to be in 0.75 cu-ft, you can get away with a box of about 0.58 cu-ft if you put in around 0.85 lbs of polyfill. This is a good thing given the amount of available woofer space in a Tacoma.

    Credit where credit is due: I got this from a softcopy of a 1995 Car Stereo Magazine article written by Tom Noussaine - I'm not smart enough, or dedicated enough, to have figured it out on my own.
     
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