Acoustic Panel | 2 X 4 X 1" Acoustic Sound Panel | Fabric: Black Diamond Knit Our acoustic panels have absorptive properties that "soak up" the sound energy, turning sound into heat, through friction. Highly capable of taming mid to high frequencies, absorption is essential for reducing flutter echoes and reverberations that can lead to a bright-sounding or "ringy" room. Overtone Acoustics makes your install clean and easy by including step by step instructions and free mounting hardware. Other acoustic treatment options leave you stuck using glue products that can cause permanent wall damage; our panels hang as easy as a picture. Our hand-crafted acoustic panels are constructed around a highly absorptive material. This means that fewer panels may be used to effectively treat a space.