Stone & concreteLow-frequency absorber
Data source
PTB reference data
Physikalisch-Technische Bundesanstalt
Source: Sound System Engineering, Don Davis and Carolyn Davis
Value from the PTB table, not verified
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
Reverberation chamber (ASTM C423 / ISO 354)
NRC
0.10
derived from ISO 354 lab data
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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Value from the PTB table, not verified
NRC: 0.10 (derived from ISO 354 lab data)
Measured values as a table (1 measurement)
| Build-up | NRC | 125 Hz | 250 Hz | 500 Hz | 1000 Hz | 2000 Hz | 4000 Hz |
|---|---|---|---|---|---|---|---|
| 3/16-in · 2-in | 0.10 | 0.18 | 0.11 | 0.09 | 0.07 | 0.03 | 0.03 |
Measured values as a table (1 measurement)
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