NRC - Noise Reduction Coefficient - Information

1" Contour 2" Contour 3" Contour 4" Contour 1" Pyramid 2" Pyramid 3" Pyramid 4" Pyramid Corner Traps
125 HZ 0.14 0.20 0.25 0.39 0.14 0.19 0.24 0.28 1.18
250 HZ 0.17 0.29 0.47 0.61 0.13 0.22 0.29 0.39 1.27
500 HZ 0.36 0.66 0.83 0.91 0.31 0.45 0.55 0.74 1.26
1000 HZ 0.47 0.80 0.82 0.79 0.43 0.55 0.56 0.69 1.19
2000 HZ 0.51 0.89 0.92 0.95 0.46 0.60 0.61 0.75 1.16
4000 HZ 0.61 1.02 1.04 1.03 0.54 0.76 0.85 0.96 1.16
Overall NRC 0.40 0.65 0.75 0.80 0.35 0.45 0.50 0.65 1.20

The higher the rating, the more sound absorbed by the material.