WoodLow-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
Hardboard panel, 1/8 inch, 1 lb/ft² with bituminous roofing felt
PTB reference data
Original description
Hardboard panel, 1/8 inch, 1 lb/ft² with bituminous roofing felt
Material properties
Thickness: 1/8 inch
Wall distance: 2 inch
Surface weight: 1 lb/ft²
Backing: bituminous roofing felt
Measurement data
Sound absorption
Reverberation chamber (ASTM C423 / ISO 354)
NRC
0.25
derived from ISO 354 lab data
Frequency values
αp nach ISO 11654
| f (Hz) | 125 | 250 | 500 | 1k | 2k | 4k |
|---|---|---|---|---|---|---|
| αp | 0.90 | 0.45 | 0.25 | 0.15 | 0.10 | 0.10 |
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Value from the PTB table, not verified
NRC: 0.25 (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 |
|---|---|---|---|---|---|---|---|
| 1/8-in · 1 lb/ft² · 2-in | 0.25 | 0.90 | 0.45 | 0.25 | 0.15 | 0.10 | 0.10 |
Measured values as a table (1 measurement)
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