Primacoustic CONTROL CUBE Panel 24" x 24" x 2", Beveled Edge - Black, 12 PackPrimacoustic Broadway Control Cubes are an attractive, easy to install acoustic treatment when you want to control primary reflections, eliminate flutter echo, and reduce standing waves. Made from high density 6 pound per cubic foot high density fiberglass. Span Control Cubes across wall surfaces to treat bothersome reflections that exist between the sound source and the listener. The panels are typically spread in an array that does not completely