Perforated metal cassette ceiling with 20 mm Sillan acoustic panels

PTB reference data

Original description

Material properties

Wall distance: 350 mm

Perforation: approx. 15%

Backing: 20 mm Sillan acoustic panels

ISO 354 – reverberation chamber

αw

0.73

αp nach ISO 11654

125 Hz

0.50

250 Hz

0.85

500 Hz

0.70

1000 Hz

0.85

2000 Hz

0.85

4000 Hz

0.80

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Method (354): Measured