Topakustik 28/4 M grooved and perforated fiber absorber

Topakustik – 28/4 M

PTB reference data

Original description

Material properties

Manufacturer: n'H Akustik + Design AG

Wall distance: 200 mm

ISO 354 – reverberation chamber

αw

0.69

αp nach ISO 11654

125 Hz

0.65

250 Hz

0.95

500 Hz

0.95

1000 Hz

0.70

2000 Hz

0.50

4000 Hz

0.45

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Method (354): Measured