A: Panels are rated in NRC (Noise Reduction Coefficient) and our bass traps in Sabins (device of evaluate of audio absorption during the inch-pound procedure). All of bass traps and panels are independently examined by Riverbank Acoustics. The higher the absorption # the higher the panel is. Environmental Sustainability: https://fake-eyelashes90864.blogminds.com/the-best-side-of-noise-reduction-31825159