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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: First Reflection -- Absorbtion, Diffusion or Both? posted by astralpen on February 28, 2007 at 10:58:45:
David is right, difusion needs room to work, absorption at the 1st reflection points is what is best for most rooms.However, you say you are using "egg crate" foam, but give no other details.
How thick is the foam overall (tip of 'egge' to rear flat surface)?
If it is not much more than 2" or so, this may be a part of the problem, as then it means that the absorption is not occuring at lower frequencies.The other side of the problem is having an area that is too large with the thickness too thin. A wall panel for absorbing the 1st reflection should be approx. 30-36" wide and about 48" tall. If your foam is larger than that, and not thick enoug, this could cause a problem for the imaging.
Finally, if it is foam that is not designed for acoustics use, such as the type intended for use as a bed mattress pad, then it may be reflecting more of the upper midrange and lower treble than a good grade of acoustic foam (or fiberglass) would. This could also be a cause of imaging problems. You might be able to "fix" this by adding a layer of polyester batting over the front surface of the foam. The 1/2" to 3/4" thick hi-loft type is what you would want to get.
Jon Risch
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Follow Ups
- Re: First Reflection -- Absorbtion, Diffusion or Both? - Jon Risch 18:57:33 02/28/07 (0)
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