Profilia & Tonewood - D = 200 mm (A)

PTB reference data

Original description

Material properties

Thickness: 7.9 in

Reverberation chamber (ASTM C423 / ISO 354)

NRC

0.45

derived from ISO 354 lab data

α_p nach ISO 11654

f (Hz)	125	250	500	1k	2k	4k
α_p	0.10	0.35	0.80	0.40	0.25	0.35

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Value from the PTB table, not verified

NRC: 0.45 (derived from ISO 354 lab data)

Measured values as a table (1 measurement)

Profilia & Tonewood - D = 200 mm (A): sound absorption coefficient αs per ISO 354 by frequency and test build-up
Build-up	NRC	63 Hz	125 Hz	250 Hz	500 Hz	1000 Hz	2000 Hz	4000 Hz	8000 Hz
Measurement 1	0.45	0.04	0.10	0.35	0.80	0.40	0.25	0.35	0.45

Measured values as a table (1 measurement)

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Last updated: 08/28/2026