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, Cleveland, Severance Hall

PTB reference data

Original description

Material properties

No further information available.

Measurement data

Sound absorption

ISO 354 – reverberation chamber

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

α_w

1.00

Frequency values

α_p nach ISO 11654

f (Hz)	125	250	500	1k	2k	4k
α_p	0.65	0.80	0.90	1.00	1.00	0.95

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Value from the PTB table, not verified

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, Cleveland, Severance Hall: sound absorption coefficient αs per ISO 354 by frequency and test build-up
Build-up	α_w	125 Hz	250 Hz	500 Hz	1000 Hz	2000 Hz	4000 Hz
Measurement 1	1.00	0.65	0.78	0.92	0.99	1.02	0.96

Measured values as a table (1 measurement)

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Last updated: 04/09/2026