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| ASTM C423 | ASTM E-90 | ASTM E-413 | |||
| Freq (Hz) |
Absorption Coefficient |
NRC | Freq (Hz) |
Specimen TL (dB) |
No. of Deficiencies |
| 50 | 0.08 | ||||
| 63 | 0.15 | ||||
| 80 | 0.14 | 80 | 16.4 | 0 | |
| 100 | 0.30 | 100 | 18.4 | 0 | |
| 125 | 0.45 | 125 | 20.3 | 4 | |
| 160 | 0.70 | 160 | 22.4 | 6 | |
| 200 | 0.89 | 200 | 24.4 | 5 | |
| 250 | 1.03 | 1.030 | 250 | 26.3 | 6 |
| 315 | 1.07 | 315 | 28.3 | 4 | |
| 400 | 1.04 | 400 | 30.4 | 5 | |
| 500 | 1.13 | 1.130 | 500 | 32.3 | 1 |
| 630 | 1.05 | 630 | 34.4 | 0 | |
| 800 | 1.01 | 800 | 36.4 | 0 | |
| 1000 | 1.02 | 1.020 | 1000 | 38.4 | 0 |
| 1250 | 1.02 | 1250 | 40.3 | 0 | |
| 1600 | 0.98 | 1600 | 42.4 | 0 | |
| 2000 | 1.00 | 1.000 | 2000 | 44.4 | 0 |
| 2500 | 0.94 | 2500 | 46.3 | 0 | |
| 3150 | 0.88 | 3150 | 48.3 | 0 | |
| 4000 | 0.84 | 4000 | 50.4 | 0 | |
| 5000 | 0.84 | 5000 | 52.3 | 0 | |
| 6300 | 0.84 | ||||
| 8000 | 0.76 |
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