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
Orchestra, choir, densely seated audience
PTB reference data
Original description
Orchestra, choir, densely seated audience
Material properties
No further information available.
Measurement data
Sound absorption
ISO 354 – reverberation chamber
Values per m² of audience area, not per chair or person.
αw
0.95
Frequency values
αp nach ISO 11654
| f (Hz) | 125 | 250 | 500 | 1k | 2k | 4k |
|---|---|---|---|---|---|---|
| αp | 0.60 | 0.75 | 0.90 | 0.95 | 0.95 | 0.85 |
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Value from the PTB table, not verified
Measured values as a table (1 measurement)
| Build-up | αw | 125 Hz | 250 Hz | 500 Hz | 1000 Hz | 2000 Hz | 4000 Hz | 6300 Hz |
|---|---|---|---|---|---|---|---|---|
| Measurement 1 | 0.95 | 0.60 | 0.74 | 0.88 | 0.96 | 0.93 | 0.85 | 0.80 |
Measured values as a table (1 measurement)
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