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Reload Thread: To polyfill or not to polyfill, that tis the question.....

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    hogger's Avatar
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    To polyfill or not to polyfill, that tis the question.....

    Ive just got my suybs going, thay sound so good, but someone told me they would sound even cleaner than they already do if I used polyfill, or just stuff it with some cotton, what do you all think???







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    it will make it louder.. use it if you want subs louder and especially if you have a smaller box. polyfil makes the sub feel it's in a bigger box than it really is becuz it slows down the sine wves inside the box



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    Originally posted by more_spl
    it will make it louder.. use it if you want subs louder and especially if you have a smaller box. polyfil makes the sub feel it's in a bigger box than it really is becuz it slows down the sine wves inside the box
    There are no waves inside of a box, well, at least none that will effect the performance of the driver. The polyfill will decrease the Fs, causing a seeming increase in box size. It's useful when you don't have the enclosure space for a certain driver.




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    more_spl's Avatar
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    good, i wasn't sure on that so i added it into my statements hoping somebody would clarify it. but when subs hit, don't they produce - and + since waves? one goes forward and one back? so when subs aren't in enclosures the 2 cancel? how does "no enclosure cancellation" work?



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    Mark_ab's Avatar
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    Someone correct me if I'm wrong here, and just talking out of my ***. All sound waves are sine waves. This is just what the waves "look" like, made up of peaks and nodes. In order for a sine wave to reflect off of a surface, at least 1/4 of the wave must be formed. Inside of a subwoofer box this is impossible since there is not enough room for a sine wave to actually be 1/4 of a wavelength. This is due to the immense size of subbass sine waves. Even at 80hz, a 1/4 length wave is still a touch over 3.5 feet. Unless you have an impossibly long box in your trunk, you will not get colorization as a result of standing waves. When a subwoofer creates a wave, one goes forward, one goes backwards. I fail to see how they cancel each other out, however, since both travel in opposite directions. Maybe someone else can clear this up.




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    wait a minute .. /puts on serious face
    i read this on installer.com just now.

    A sealed enclosure is designed to keep the back wave of the speaker from coming in contact with the front wave of the speaker.
    now isn't this what i said? am i wrong



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    it refers to if it were in a free air situation...
    it would rebound 3.5 feet away......
    and then come forward... it owuld interfere with the enwest waves being produced...



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    You would make the assumption that the waves never break down, or relect perfectly 180 degrees each time, in order for colorization to occur. Generally speaking, this is not the case.




    Is this not a reasonable place to park?

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    Just try it with and without, sometimes it can make it sound better and or louder , sometimes it may not affect it to where you can tell and sometimes it will make it sound worse. It all depends on the subs, box, vehicle, install, etc. I have had a lot of different experience with polyfill and none of it is consistant.




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    I'm not exactly sure how it works, so im not goin to try, but it does give it an extra boost so id try it.




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