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 moderately upholstered seating 0.85 m x 0.63 m (series 2)
PTB reference data
Original description
Audience on moderately upholstered seating 0.85 m x 0.63 m (series 2)
Material properties
Dimensions: 0.85 m x 0.63 m
Measurement data
Sound absorption
Reverberation chamber (ASTM C423 / ISO 354)
Values per m² of audience area, not per chair or person.
NRC
0.90
derived from ISO 354 lab data
Frequency values
αp nach ISO 11654
| f (Hz) | 125 | 250 | 500 | 1k | 2k | 4k |
|---|---|---|---|---|---|---|
| αp | 0.70 | 0.80 | 0.90 | 0.95 | 0.95 | 0.85 |
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Value from the PTB table, not verified
NRC: 0.90 (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 |
|---|---|---|---|---|---|---|---|---|
| gepolstert | 0.90 | 0.72 | 0.82 | 0.91 | 0.93 | 0.94 | 0.87 | 0.77 |
Measured values as a table (1 measurement)
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