www.silentsource.com has sheet rock replacements that are sonically absorbative. I'd call them.
New Dedicated Audio Room
I am in the initial stages of buying and building a new home. This home is going to have a dedicated audio room. (Approx 18'x 26') I will be working with the builders regarding the room and want to hear some suggestions regarding sonic improvements. I plan on using Hubbell outlets with 4 dedicated AC lines. I am also going to have the builders use thicker sheet rock for the walls and ceilings. Any other suggestions??