Primacoustic CONTROL CUBE Panel 24" x 24" x 2", Square Edge - Black, 12 PackMade from high density 6 pound per cubic foot high density fiberglass, Control Cubes are spanned across wall surfaces to treat bothersome reflections that exist between the sound source and the listener. The panels are typically spread in an array so as not to completely deaden the room. This helps control acoustic problems while leaving a sense of 'air' or space in the room. The Control Cube's square design is particularly well suited for large wall