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
Seating, unoccupied, fabric-covered, padded, perforated seat undersides
PTB reference data
Original description
Seating, unoccupied, fabric-covered, padded, perforated seat undersides
Material properties
Perforation: perforated
Measurement data
Sound absorption
Reverberation chamber (ASTM C423 / ISO 354)
Values per m² of audience area, not per chair or person.
NRC
0.80
derived from ISO 354 lab data
Frequency values
αp nach ISO 11654
| f (Hz) | 125 | 250 | 500 | 1k | 2k | 4k |
|---|---|---|---|---|---|---|
| αp | 0.50 | 0.65 | 0.80 | 0.90 | 0.80 | 0.70 |
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Value from the PTB table, not verified
NRC: 0.80 (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 |
|---|---|---|---|---|---|---|---|---|
| unbesetzt, durchschnittlich with Stoff bezogen, gut gepolstert, Unterseiten der Sitze perforiert | 0.80 | 0.49 | 0.66 | 0.80 | 0.88 | 0.82 | 0.70 | 0.64 |
Measured values as a table (1 measurement)
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