Reference: audienceHighly absorbent

Physikalisch-Technische Bundesanstalt

Source: Dalenbäck, Datensatz der CATT-Software, November 2000. Data-Category in CATT: AUDIENCE_104, C: Audiences, D: Audience

Value from the PTB table, not verified

Audiences, audience area, 1.04 persons / m2 (CATT: AUDIENCE_104)

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

0.65

derived from ISO 354 lab data

α_p nach ISO 11654

f (Hz)	125	250	500	1k	2k	4k
α_p	0.15	0.30	0.55	0.80	0.90	0.90

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Value from the PTB table, not verified

NRC: 0.65 (derived from ISO 354 lab data)

Measured values as a table (1 measurement)

Audiences, audience area, 1.04 persons / m2 (CATT: AUDIENCE_104): 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
1,04 persons / m2	0.65	0.16	0.29	0.55	0.80	0.92	0.90

Measured values as a table (1 measurement)

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Last updated: 09/04/2026