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Comments on DIY Cylindrical Bass Absorber

209.215.72.207

Posted by Jon Risch on August 23, 1999 at 10:53:04

In Reply to: DIY Cylindrical Bass Absorber posted by Jon T. Gale on August 22, 1999 at 21:33:54:

I have looked into these pipe insulators before, and they are invariably too dense for best operation in terms of bass absorbing. The high density, coupled with the use of a bonding resin makes them not porous enough to fully absorb as much bass as an ASC unit. Yes, they will absorb some bass, and even some energy in the mids and highs, however, they are not directly comparable to the ASC devices, or my own design for bass traps.

If this particular brand of pipe insulation happens to have density that is closer to what is needed, then they might be very effective. It is hard to tell, as Mr. Gale does not seem to have the correct information. If these actually had a density of 70-100 lbs per square in., they would be heavier than solid glass, and totally impermeable by anything!

It is tempting to think that something can be made with very little labor, and the prices are certainly not very high, just realize that they may not be as effective as either the ASC devices, or my own recipe, which has been tested against the ASC devices, and came out as good or better.

If you go to the trouble to build them, and they do not absorb as much bass, then it might take twice as many to get the same damping, i.e., two stacked in each corner, just to equal one ASC. If WAF is not an issue, then this may not be an issue for you.

Foer those not yet familiar with my own recipe for bass traps, see:
http://members.xoom.com/Jon_Risch/a1.htm

I would also recommend that the ends be made from 3/4" plywood or particle board, rather than dry wall. If you ever want to stand mount them, or hang them, the dry wall will not provide the best medium for screw hook, etc. It might also be a good idea to wrap a wire frame around the outside that is bonded/stapled/glued to the end caps, in order to help give the unit some structural integrity should you wish to hang or mount them other than setting on the floor. I would also recommend a layer of polyfil to contain the fiberglass, a single layer of cloth WILL NOT retain the glass fibers, and this could be a health hazard.

Jon Risch

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