Acoustic Foams: 5 Fast Facts

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Fact #1. Acoustic design is an old architectural art form. It reaches at least as far back as the construction of early Greek amphitheaters, as well as royal concert halls and performance spaces throughout Europe. The growth of European Christianity also coincided with some of the most elaborately designed holy buildings in history. Most of these were built specifically with acoustics in mind.
Fact #2. Digital manipulation of sound has made it possible to take a signal and build a theoretical room all around it. As such, the desire has shifted from tracking tones rich in natural reverb to tracking tones that are as dry as possible. As the new guard takes control of the sonic landscape, acoustic foam will prove to be the ultimate tool.
Fact #3. Most acoustic foams come in sets of 12 or 24 square tiles that you can position around the room as you see fit. You'll notice, however, that the images of most layouts feature an alternating alignment pattern. One tile is placed with its ridges running vertically, while the tiles on either side of it have their ridges running horizontally. In this distribution, the larger pattern of tiles enhances the smaller pattern of the ridges themselves.
Fact #4. Thickness is also a concern with acoustic foam. Thicker tiles will absorb wider frequency ranges and a higher percentage of sound waves. Most tiles are well-suited for vocal work, though. They'll eradicate reflections of anything in the 1 kilohertz to 3 kilohertz range.
Fact #5. There are some foams that don't come as a set of tiles, but as a miniature, desktop audio booth. The configuration of this booth is absolutely ideal for tracking vocals and voices pretty much anywhere you set it up. It's ideal for podcasters, in particular. Beware that small bits of sound that don't get fully absorbed can hit a wall behind you and bounce back into your microphone.