Reference: audienceHighly absorbent
Data source
PTB reference data
Physikalisch-Technische Bundesanstalt
Source: Dalenbäck, Datensatz der CATT-Software, November 2000. Data-Category in CATT: CHAIRS71, C: Chairs, D: Unoccupied
Value from the PTB table, not verified
Chairs, unoccupied average cloth-covered well upholstered areas (perforated bottoms)
PTB reference data
Original description
Chairs, unoccupied average cloth-covered well upholstered areas (perforated bottoms)
Material properties
Perforation: perforated bottoms
Surface: cloth-covered
Measurement data
Sound absorption
ISO 354 – reverberation chamber
Values per m² of audience area, not per chair or person.
αw
0.80
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
Measured values as a table (1 measurement)
| Build-up | αw | 125 Hz | 250 Hz | 500 Hz | 1000 Hz | 2000 Hz | 4000 Hz |
|---|---|---|---|---|---|---|---|
| cloth-covered well upholstered areaes (seats with perforated bottoms) | 0.80 | 0.49 | 0.66 | 0.80 | 0.88 | 0.82 | 0.70 |
Measured values as a table (1 measurement)
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