2" Acoustic Studiofoam Wedges: Overall NRC = .80 (12 per box; 96 square feet); Recommended Adhesive: 1 Foamtak or 3 Tubetak per box. Our most popular studiofoam seller and best overall performer. 2" Studiofoam Wedges treat most small to medium sized areas including vocal booths, sound control rooms and sound studios. These Studiofoam Wedges effectively kill standing waves and flutter echoes and, when used in conjunction with LENRD Bass Traps, Venus™ Bass Traps or Sunburst Broadband Sound Absorbers, can effectively tame the full frequency bandwidth in virtually any size room. 2" Acoustic Studiofoam is simply the workhorse of the sound control industry.