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Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ. |
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Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ. |
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In Reply to: All fiberglass is porous, so how can a "sealed" fiberglass trap exist? posted by Karl W. on November 2, 2003 at 05:20:47:
It would really help if you actually read my original DIY note at:
http://www.geocities.com/jonrisch/a1.htmSealed as in air tight around the periphery of the compressed fiberglass, or the higher density fiberglass panels, etc.
Once you have a higher density fiberglass shell, it behaves in a resistive manner acoustically, and provides one half of the effective acoustic RC circuit that damps the bass energy.
This fiberglass cylinder with solid end caps does not have to be totally impervious, just dense enough to restrict the pasage of the air pressure at some low frequency. The air volume inside acts as the C < the resistive fiberglass cylinder/shell acts as the R, and a damping circuit is formed that dissipates bass energy via pressure differentials. This is how the ASC tube traps work as well.
Jon Risch
This post is made possible by the generous support of people like you and our sponsors:
Follow Ups
- Sigh. - Jon Risch 11/2/0317:55:41 11/2/03 (2)
- I've both read and built your traps. - Karl W. 07:46:28 11/4/03 (1)
- Re: I've both read and built your traps. - mfi 18:49:55 11/5/03 (0)
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