Acoustic Absorption Calculator
NRC (Noise Reduction Coefficient)
64.0%
Average of absorption at 250, 500, 1000, 2000 Hz
250 Hz
17.4%
500 Hz
50.5%
1 kHz
89.3%
2 kHz
98.7%
Normal-Incidence Absorption Coefficients
| Frequency | Absorption (α) | Visualization |
|---|---|---|
| 25 Hz | 0.0% | |
| 50 Hz | 0.0% | |
| 100 Hz | 1.5% | |
| 250 Hz | 17.4% | |
| 500 Hz | 50.5% | |
| 2 kHz | 98.7% | |
| 5 kHz | 100.0% | |
| 10 kHz | 99.2% | |
| 16 kHz | 99.8% |
Calculated for a rigid-backed sample at normal incidence (tube method)
Range: 1 - 300 mm
Range: 0 - 600 mm
Material Properties
Flow Resistivity:
10500 Pa·s·m⁻²
Porosity:
0.995
Tortuosity:
1.006
Viscous Length:
240 μm
Thermal Length:
470 μm