A: Panels are rated in NRC (Noise Reduction Coefficient) and our bass traps in Sabins (unit of measure of sound absorption from the inch-pound method). All of bass traps and panels are independently analyzed by Riverbank Acoustics. The higher the absorption # the higher the panel is. Like doors, https://andrewy665dwl1.activablog.com/33868221/little-known-facts-about-decibel-reduction