FabricHighly absorbent
Data source
PTB reference data
Physikalisch-Technische Bundesanstalt
Source: J.Meyer, Kirchenakustik, Verlag E.Bochinsky
Value from the PTB table, not verified
Double curtain fabric, 20 cm distance
PTB reference data
Original description
Double curtain fabric, 20 cm distance
Material properties
Wall distance: 7.9 in
Measurement data
Sound absorption
Reverberation chamber (ASTM C423 / ISO 354)
NRC
0.75
derived from ISO 354 lab data
Frequency values
αp nach ISO 11654
| f (Hz) | 125 | 250 | 500 | 1k | 2k | 4k |
|---|---|---|---|---|---|---|
| αp | 0.15 | 0.50 | 0.75 | 0.80 | 0.90 | 0.95 |
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Value from the PTB table, not verified
NRC: 0.75 (derived from ISO 354 lab data)
Measured values as a table (1 measurement)
| Build-up | NRC | 125 Hz | 250 Hz | 500 Hz | 1000 Hz | 2000 Hz | 4000 Hz |
|---|---|---|---|---|---|---|---|
| 20 cm | 0.75 | 0.17 | 0.48 | 0.77 | 0.81 | 0.90 | 0.95 |
Measured values as a table (1 measurement)
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