Heavily upholstered chair, occupied, front side of seat back 7.5 cm, rear side of seat back sometimes, top of seat bottom 10 cm, arm rests 2 cm, Edmonton, Jubilee Hall

PTB reference data

Original description

Material properties

Thickness: 3 in (front of seat back), 3.9 in (seat bottom), 0.8 in (arm rests)

Application: chair

Measurement data

Sound absorption

Reverberation chamber (ASTM C423 / ISO 354)

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

NRC

0.90

derived from ISO 354 lab data

Frequency values

α_p nach ISO 11654

f (Hz)	125	250	500	1k	2k	4k
α_p	0.90	0.85	0.90	0.95	0.95	1.00

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Value from the PTB table, not verified

NRC: 0.90 (derived from ISO 354 lab data)

Measured values as a table (1 measurement)

Heavily upholstered chair, occupied, front side of seat back 7.5 cm, rear side of seat back sometimes, top of seat bottom 10 cm, arm rests 2 cm, Edmonton, Jubilee Hall: 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	0.90	0.91	0.83	0.88	0.95	0.93	0.98

Measured values as a table (1 measurement)

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Last updated: 09/04/2026