Vented subwoofers and dampening questions.

Discussion in 'Archived Threads 2001-2004' started by Neil Joseph, Sep 23, 2001.

  1. Neil Joseph

    Neil Joseph Lead Actor

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  2. Patrick Sun

    Patrick Sun Moderator
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    Line the walls with batting material, but I wouldn't worry about adding polyfill material unless you are just experimental in nature, if so, I would not go beyond 25% fill (100% = 1 pound per 1 ft^3).
     
  3. Bill Catherall

    Bill Catherall Screenwriter

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  4. Neil Joseph

    Neil Joseph Lead Actor

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    Now is polyester batting something like cotton ball material (that you clean your face with)? What exactly is polyfill material? The stuff I bought is more solid like the cushony pillows and looks like the bottom of an egg carton (bumpy). I got enough to cover about 80^ of the side walls of the sonotube. I have not bought anything yet to stick on the interior of the endcaps. I need to know how much of this stuff I shoulf be using and what to use (and how much) on the endcaps.
    Thanks for what may be a dumb question.
    orangeman
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  5. Patrick Sun

    Patrick Sun Moderator
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    Check out this thread for pictures of polyfill and batting.
    There's no "right" answer to your question. Some feel the inclusion of the padding on the walls make a difference, others don't. If you're determine about using the egg crate foam, then line the walls with one layer of the stuff.
    As far as the endcap, you're better off building a "tilt" in interior of one of the endcap surfaces so you don't get waves bouncing straight up and down. But one layer of the foam should be sufficient as well.
    My Sunosub I doesn't have any lining or stuffing, and it sounds fine to me. Sunosub II has polyester batting lining the insides, and it sounds fine to me. Sunosub III is stuffed 25% with polyfill (24 ounces in a 6 ft^3 enclosure) and it lowered the tuning frequency from 16Hz to 12Hz and helped in transient response.
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  6. Neil Joseph

    Neil Joseph Lead Actor

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    I think what I may do is use the eggcrate foam to cover 80% of the sidewall and then use a 1" layer of the soft foamy cotton stuff on the exposed areas of the endcaps. I do not want to overdampen.
    orangeman
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