Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ.

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Re: Q about DIY tube trap

Posted by Jon Risch (B) on October 28, 2001 at 07:11:56

In Reply to: Re: Q about DIY tube trap posted by FAT on October 27, 2001 at 11:07:36:

As with many things audio, it depends. Application and end purpose come into play.

For the type of tube trap using an acoustical air space inside, and a layer of compressed fiberglass material, it seems to be around 1.75 to 2 lbs per cu. ft. HOWEVER, if you use fiberglass with this density already present, it does not seem to work as well as when the material is compressed from a lower density.

Rock wool can use a slightly lower density.

For sound absorption inside a speaker cabinet, from 0.5 to 0.7 lbs per cu. ft. density of fiberglass or other good absorbermaterials is best, with the lower density directly behind a woofer or midrange, and the higher density in the corners and on the side wall away from the woofer.

Sound absorbing wall panels with air space behind them like to be in this range or slightly more dense, as there is also the issue of too much upper mid/HF reflectance with increased density.

This is all from personal experience and experimentation, using both instrumentation and listening comparisions.

Jon Risch

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