| Hz | Flat
Polyflex NRC: 0.70 |
ProFoam™ 1 Layer: 2'' |
ProFoam™ 2 Layers: 3'' |
ProFoam™ 3 Layers: 4'' |
| 125 | 0.06 | 0.14 | 0.13 | 0.26 |
| 160 | 0.09 | 0.13 | 0.34 | 0.68 |
| 200 | 0.07 | 0.16 | 0.47 | 0.99 |
| 250 | 0.15 | 0.30 | 0.61 | 1.07 |
| 315 | 0.37 | 0.42 | 1.22 | 1.44 |
| 400 | 0.51 | 0.66 | 1.27 | 1.35 |
| 500 | 0.76 | 1.08 | 1.19 | 1.21 |
| 625 | 1.03 | 1.26 | 1.20 | 1.35 |
| 800 | 1.10 | 1.14 | 1.21 | 1.40 |
| 1000 | 1.09 | 1.11 | 1.22 | 1.36 |
| 1250 | 0.94 | 1.00 | 1.19 | 1.26 |
| 1600 | 0.91 | 0.96 | 1.08 | 1.17 |
| 2000 | 0.86 | 0.99 | 1.06 | 1.17 |
| 2500 | 0.87 | 0.99 | 1.05 | 1.14 |
| 3150 | 0.91 | 1.03 | 1.06 | 1.13 |
| 4000 | 0.95 | 1.01 | 1.09 | 1.14 |
Absorption Coefficients
Measured at IBM Hudson Valley Acoustics Lab according to ASTM C423
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Copyright
2000, RPG Diffusor Systems, Inc. |