| Hz | Absorption Coefficient |
| 125 | 0.39 |
| 160 | 0.29 |
| 200 | 0.20 |
| 250 | 0.19 |
| 315 | 0.12 |
| 400 | 0.12 |
| 500 | 0.10 |
| 625 | 0.10 |
| 800 | 0.11 |
| 1000 | 0.10 |
| 1250 | 0.09 |
| 1600 | 0.09 |
| 2000 | 0.08 |
| 2500 | 0.11 |
| 3150 | 0.13 |
| 4000 | 0.14 |
Measured According to ASTM C423 at Riverbank Acoustical Laboratories (RAL-A93-218).
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2000, RPG Diffusor Systems, Inc. |