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Reload Thread: Putting Foam and Dynamat inside Sub enclosure?

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    Farkel's Avatar
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    Putting Foam and Dynamat inside Sub enclosure?

    Just wondering if this would give any slight benefits... like you're suppose to put foam behind the component speaker mid bass, wondering if the same applies for a sub in an enclosure







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    Re: Putting Foam and Dynamat inside Sub enclosure?

    Nope. The foam behind the midrange is to break up standing waves that might color the sound of the midrange. The wavelengths involved in bass and sub bass are so long that standing waves aren't an issue.



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    Re: Putting Foam and Dynamat inside Sub enclosure?

    So why does JL have diagrams of enclosures with foam in them? What is it used for in those?




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    Re: Putting Foam and Dynamat inside Sub enclosure?

    The foam you are thinking of is actually something like polyfill. Resembles cotton.




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    Re: Putting Foam and Dynamat inside Sub enclosure?

    Quote Originally Posted by helotaxi View Post
    Nope. The foam behind the midrange is to break up standing waves that might color the sound of the midrange. The wavelengths involved in bass and sub bass are so long that standing waves aren't an issue.
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    Re: Putting Foam and Dynamat inside Sub enclosure?

    i remember reading somewhere that putting foam/polyfill/fiberglass, it helps make the sound more real... eliminating/reducing box/port resonance and all weird sound caused buy the pressure in the box.




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    Re: Putting Foam and Dynamat inside Sub enclosure?

    Well it seems they have taken those pics down. But it looked like egg crate in some of the boxes they had on there at one time.




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