According to Wikipedia, the free encyclopedia; “Acoustic foam is foam used for acoustic treatment. It is typically open-celled. It attenuates airborne sound waves by increasing air resistance, thus reducing the amplitude of the waves. The energy is dissipated as heat”.From Aurelex Acoustics (retails at $2.59 per square foot) check out these 2’ x 4’ sonomatts. Aurolex Acoustics Sonomats are cut in the “eggcrate” style to keep the price low.
NOTE: Due to the manufacturing process, the eggcrate pattern is not square to the edges of the panels, so installing these panels side-by-side does not work visually, however if you intend to cover the panels with acoustical cloth you could install side-by-side.
Aurelex Studiofoam Wedgies are 2” thick 1’x1’ square, perfect for spot treating in studios, iso booths and more. Studiofoam Wedgies are a great solution for small flutter echo problem area, and when spread apart, yield beneficial sound diffusion off of their exposed edges.
One reviewer said – “Makes for a great and excellent studio environment, especially for small rooms and for recording. Awesome!” (at musiciansfriend.com).
For installation, Studiofoam Wedgies require Aurelex Foamtak spray adhesive. This adhesive allows you to remove the foam later.
Building a Recording Studio 