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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: Sound board for absorbers? posted by kameron on March 26, 2003 at 21:22:37:
Thickness is needed to create a more linear absorption of the sound reflections, absorbing just the HFs or the HFs and some of the mids can lead to a tonal balance problem.You mention 'sound board' from the hardware store. This is typically going be too reflective in the mid-bass and lower midrange, and then at some other mid-bass frequency, it will act as a diaphramatic absorber, and there will be a suck-out of energy.
Yes, putting a layer or two of polyester batting over it will help with the HF and midrange absorption, but wil not fix the mid-bass and lower midrange problems.
If fibeglass is the issue, then the other alterantive is foam based prodcuts, which do not look that great, and are expensive. They are generally limited in the available thickness, and if you only use a 1" or 2" thickness, you will probablyu not be very happy with the results.
You might want to consider use of some fabric covered semi-rigid fiberglass panels, these are less likely to shed, and when wrapped in the proper cloth (Guilford, etc.) they can be made to look good and contain any glass fibers.
Owens-Corning Type 700 series (I recommend 704 or 705 density)
Johns Manville 1000 Series Spin-Glas, etc.
A minimum of 2" thickness for the fiberglass panel (they usually come up to 4" in thickness, but the 2" is more common) should be used.
They work best when there is some air space behind them, from 1" up to 3 or 4" will extend the absorption down to lower frequencies.
A search on the web using the keywords "semi-rigid fiberglass" at Google should come up with a lot of sources for these that have a
cloth covering already present.One such example is:
http://www.silentsource.com/fwpanels-acousticore.html
or
http://www.mpcsilentwall.com/accoustical.htmhttp://www.acousticalsolutions.com/products/panels/index.asp
http://www.acousticalsolutions.com/products/panels/alphasorb.asp
(This last one has close up pictures of the panels, and prices, as well as links to installation info, etc)Note that these are going to be a lot more expensive, but do not require any "assembly".
They still require some sort of installation. Many of the sites listed or found will have some info on installation details, so you can get a better idea of what is required if you should decide to wrap some raw panels, and then install them.
Jon Risch
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Follow Ups
- Re: Sound board for absorbers? - Jon Risch 10:35:02 03/27/03 (1)
- Re: Sound board for absorbers? - kameron 13:54:23 03/27/03 (0)
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