Physikalisch-Technische Bundesanstalt
Source: M. Heckl, H.A. Müller: Taschenbuch der Technischen Akustik, Springer 1994
Original description
Perforated gypsum board, 19.6% open area, 15 mm hole diameter, 100 mm cavity
ISO 354 – reverberation chamber
αp nach ISO 11654
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Method (354): Measured
