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The black 4-pack of UA-STP-BP 24 x 18" Rectangular Stepped-Shape Diffusor from Ultimate Acoustics is a hard, high-impact surface that is designed to diffuse sound evenly across a room. It can be used in various environments for taming flutter and echo effects in tracking spaces, control rooms or any environment in need of controlled sound reflections. In addition, the Rectangular Stepped-Shape Diffusor helps maintain a "live" sound and offers a sense of dimension to your room.