Primacoustic BROADBAND Panel 24'' x 48'' x 3", Square Edge - Black, 4 PackThe F103 2448 00 3" Thick Broadway Panel Control Columns (Black) from Primacoustic is a set of high density absorptive panels designed to provide an acoustic treatment where you want to control primary reflections, eliminate flutter echo, and reduce standing waves. A typical installation includes a series of these panels installed between the sound source and the listener, usually spread across a wall surface with space between each panel. This