Reference: audienceHighly absorbent
Data source
PTB reference data
Physikalisch-Technische Bundesanstalt
Source: M. Heckl, H.A. Müller: Taschenbuch der Technischen Akustik, Springer 1994
Value from the PTB table, not verified
Audience on wooden chairs (1 person/m²)
PTB reference data
Original description
Audience on wooden chairs (1 person/m²)
Material properties
No further information available.
Measurement data
Sound absorption
Reverberation chamber (ASTM C423 / ISO 354)
Values per m² of audience area, not per chair or person.
NRC
0.60
derived from ISO 354 lab data
Frequency values
αp nach ISO 11654
| f (Hz) | 125 | 250 | 500 | 1k | 2k | 4k |
|---|---|---|---|---|---|---|
| αp | 0.15 | 0.25 | 0.55 | 0.70 | 0.80 | 0.80 |
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Value from the PTB table, not verified
NRC: 0.60 (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 | 6300 Hz |
|---|---|---|---|---|---|---|---|---|
| 1 Person pro m^2 | 0.60 | 0.16 | 0.24 | 0.56 | 0.69 | 0.81 | 0.78 | 0.75 |
Measured values as a table (1 measurement)
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