Reference surfaceLow-frequency absorber
Data source
PTB reference data
Physikalisch-Technische Bundesanstalt
Source: JASA 104 (6) Dec 1998
Value from the PTB table, not verified
Wood, audience floor, 2 layers, 33 mm on sleepers over concrete
PTB reference data
Original description
Wood, audience floor, 2 layers, 33 mm on sleepers over concrete
Material properties
Thickness: 1.3 in
Application: audience floor
Mounting: on sleepers over concrete
Measurement data
Sound absorption
Reverberation chamber (ASTM C423 / ISO 354)
NRC
0.05
derived from ISO 354 lab data
Frequency values
αp nach ISO 11654
| f (Hz) | 125 | 250 | 500 | 1k | 2k | 4k |
|---|---|---|---|---|---|---|
| αp | 0.10 | 0.05 | 0.05 | 0.05 | 0.05 | 0.05 |
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Value from the PTB table, not verified
NRC: 0.05 (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 |
|---|---|---|---|---|---|---|---|
| Measurement 1 | 0.05 | 0.09 | 0.06 | 0.05 | 0.05 | 0.05 | 0.04 |
Measured values as a table (1 measurement)
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