2 in. Studiofoam Pyramids treat small - to medium-sized areas including isolation booths, control rooms and sound studios. They effectively kill standing waves and flutter echoes and, when used in conjunction with our LENRD Bass Traps or Venus Bass Traps or our Sunburst Broadband Absorbers, can effectively tame the full frequency bandwidth in virtually any acoustic environment. Eliminates Standing Waves And Flutter Echoes Reduces Unwanted Reflections Decreases Slap-Back And Room Ring Studiofoam Can Improve Any Space! Precision Surface Profiling