DIY Bass Tube Traps

I am thinking of building a few of these bass tube traps from pipe insulation. Here is a helpful link. http://www.teresaudio.com/haven/traps/traps.html Has anyone built there own tube traps before? If so, how did you do it and how were the end results? What materials did you use and was it effective? I was considering using two products made by roxul. The first product is called enerwrap and it can be viewed here: http://www.johnlsayers.com/phpBB2/posti ... wtopic&f=3 The second product I was considering was SturdiRock, which can be viewed here: http://www1.roxul.com/graphics/RX-NA/Ca ... -04-07.pdf Does anyone have any information, specs, or first hand use with this product? I am not sure which one - either the enerwrap or studirock would be more effective as a tube trap. Input, advice or comments would be appreciated by anyone, since a lot of the people on this sight seem to be extremely knowledgeable. I will be sure to post the pictures and the step by step procedure once the traps are built. Thanx again...

HW,

Heavyweighter wrote:

I was considering using two products made by roxul. The first product is called enerwrap and it can be viewed here: http://www.johnlsayers.com/phpBB2/posti ... wtopic&f=3

There's something with your second (this) link. I've tested (somewhere begin 90ties) these things of your last link (Rockwool duct isolation) in a couple of diameters (huge ones with thick wall thickness) in 1/4 pieces as corner absorbers. I know them well since I worked a lot in these industrial applications. Very roughly you can say that they give comparable effect with flat boards stradling the corner. They also show this typical peak behavior. I haven't tested them in full circels. If you use them I think I should slightly prefer fibreglass versions over rockwool versions, not for acoustic reasons but because fibreglass is a little bit less brittle than rockwool, making it a bit more fun to work with (less easily damaged). But both are good to use This is all too extensive, but in general, while looking cool, it is comparable with the traditional methods of boards stradling the corners. And this duct isolation in large sizes is relative much more expensive than flat boards. Hence I haven't tested all possible combinations, as such I draw conclusions in analogy. I should only use the principle (1/4, 1/2, 1/1 pieces) as part of some cool design (is subjective of course), not because it should give some special enhanced absorption.