BTW - for anyone interested in purchasing foam based acoustic treatment, there is a Michigan based company that sells for WAY less than Auralex or Primacoustic or the other companies that do foam based acoustic treatment that advertise in magazines and online.

http://www.foambymail.com/blog/refine-a-rooms-sound-with-custom-acoustical-sound-treatment/

There is a direct relationship between the wavelengths absorbed by foam wedge type treatment and the depth of the foam wedges. Don't go too shallow. Deeper wedges will absorb down to lower frequencies. Yes, deeper wedges are always more expensive.

-Scott