A: Panels are rated in NRC (Noise Reduction Coefficient) and our bass traps in Sabins (device of measure of sound absorption while in the inch-pound system). All of bass traps and panels are independently tested by Riverbank Acoustics. The upper the absorption # the better the panel is. Thirdly, https://hanginglightsforthebedroo71592.aboutyoublog.com/39201172/the-best-side-of-noise-reduction