Reference: audienceHighly absorbent
Data source
PTB reference data
Physikalisch-Technische Bundesanstalt
Source: J.Meyer, Kirchenakustik, Verlag E. Bochinsky
Value from the PTB table, not verified
Occupied seating, average values for churches, 1.5 persons/m²
PTB reference data
Original description
Occupied seating, average values for churches, 1.5 persons/m²
Material properties
Density: 1.5 persons/m²
Application: churches
Measurement data
Sound absorption
Reverberation chamber (ASTM C423 / ISO 354)
Values per m² of audience area, not per chair or person.
NRC
0.70
derived from ISO 354 lab data
Frequency values
αp nach ISO 11654
| f (Hz) | 125 | 250 | 500 | 1k | 2k | 4k |
|---|---|---|---|---|---|---|
| αp | 0.20 | 0.35 | 0.75 | 0.80 | 0.90 | 0.90 |
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Value from the PTB table, not verified
NRC: 0.70 (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 |
|---|---|---|---|---|---|---|---|
| 1,5 Pers. / m² · besetzt | 0.70 | 0.20 | 0.35 | 0.75 | 0.80 | 0.90 | 0.90 |
Measured values as a table (1 measurement)
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