This Acoustical Charcoal foam is effective against standing waves and flutter echoes in most small-to-medium sized rooms like vocal booths, control rooms, studios, home theaters, churches or offices.   It also functions as a full frequency bandwidth absorbent for any size room when used in conjunction with corner bass absorbents and male/female broadband absorbents. Reduces Unwanted noise and echo Make higher quality audio and video recordings Use to spot treat a professional or home recording studio, easy to shape and cut to size.