StoneLow-frequency absorber
Data source
PTB reference data
Physikalisch-Technische Bundesanstalt
Source: Sound System Engineering, Don Davis and Carolyn Davis
Flexboard, 3/16 inch unperforated cement asbestos board mounted over 2 inch air cavity
PTB reference data
Original description
Flexboard, 3/16 inch unperforated cement asbestos board mounted over 2 inch air cavity
Material properties
Thickness: 3/16 inch
Wall distance: 2 inch
Surface: unperforated
Measurement data
Sound absorption
ISO 354 – reverberation chamber
αw
0.09
Frequency values
αp nach ISO 11654
| f (Hz) | 125 | 250 | 500 | 1k | 2k | 4k |
|---|---|---|---|---|---|---|
| αp | 0.20 | 0.10 | 0.10 | 0.05 | 0.05 | 0.05 |
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Method (354): Measured