Reference: audienceHighly absorbent

Physikalisch-Technische Bundesanstalt

Source: Dalenbäck, Datensatz der CATT-Software, November 2000. Data-Category in CATT: AUDIENCE73, C: Audiences, D: Audience

Value from the PTB table, not verified

Audience on moderately upholstered chairs (0.90 m x 0.55 m) (CATT: AUDIENCE73)

PTB reference data

Original description

Material properties

No further information available.

Reverberation chamber (ASTM C423 / ISO 354)

Values per m² of audience area, not per chair or person.

NRC

0.85

derived from ISO 354 lab data

α_p nach ISO 11654

f (Hz)	125	250	500	1k	2k	4k
α_p	0.55	0.85	0.85	0.85	0.90	0.85

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Value from the PTB table, not verified

NRC: 0.85 (derived from ISO 354 lab data)

Measured values as a table (1 measurement)

Audience on moderately upholstered chairs (0.90 m x 0.55 m) (CATT: AUDIENCE73): sound absorption coefficient αs per ISO 354 by frequency and test build-up
Build-up	NRC	125 Hz	250 Hz	500 Hz	1000 Hz	2000 Hz	4000 Hz
Measurement 1	0.85	0.55	0.86	0.83	0.87	0.90	0.87

Measured values as a table (1 measurement)

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Last updated: 09/04/2026