Speaker Boy
Senior Member
Registered: 02/04/08
Posts: 62
Loc: Santa Barbara, California
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Here is a quote from ethan's acoustic guide.
"I should mention another popular type of absorber, the tube trap, which is available commercially and also as do-it-yourself plans on various web sites. Although these are often referred to as "bass traps," even the largest tube models are not very effective below about 100 Hz, and the smaller ones become ineffective much higher than that. Marketing hype aside, the real absorption mechanism in a tube trap is simply the rigid fiberglass inside. The reason a 20-inch tube trap works at all down to 100 Hz is that the tube's diameter serves to space some of the fiberglass away from the nearest boundary, which helps extend its absorption to a lower frequency. But a tube design is no more effective than using plain rigid fiberglass spaced similarly."
If you want to read the whole thing go here
http://www.ethanwiner.com/acoustics.html
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