Acoustical tile - A porous architectural material, usually constructed from fiberglass or pressed board, which is most absorptive at the high frequencies.

Absorption coefficient - Ratio of sound absorbing effectiveness, at a specific frequency, of a unit area of acoustical absorbent to a unit area of perfectly absorptive material. The portion of energy absorbed when a sound wave strikes a material. The absorption coefficient of a material is dependent on the frequency of the sound wave.

The opposite of reflection. Sound absorption results from the conversion of sound energy into another form, usually heat or motion, when passing through an acoustical medium. When a sound wave encounters resistance, absorption occurs. Absorption is measured in sabins (after Wallace Clement Sabine). One sabin is the amount of absorption offered by one square foot of open air

I picked up some cheap MDF perforated (slits) board, some had a little bit of absorber behind them. Would they be useful to put up against the walls as room treatment? I would add more absorber behind them, mostly they would be going where no 1st reflection treatments are, or behind the desk and speakers as an aesthetic item.

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dvdhawk, audiokid, pcrecord, Boswell, Kurt Foster, @Brien Holcombe, k

Hi,

Mixing techniques in SpectraLayers Pro
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I'm going to build a multi purpose studio on 5 acres in a location where there is little outside noise to be overly concerned about. I'm in the country, on a very private lake where the sound of nature is actually something I would rather hear as a natural ambience (maybe I am onto something lol)!

What is an NRC?
http://www.auralex.com/faq/what-is-an-nrc/