WoodLow-frequency absorber
Data source
PTB reference data
Physikalisch-Technische Bundesanstalt
Source: JASA 104 (6) Dec 1998
Value from the PTB table, not verified
Wood, 19 mm, over 25 mm compressed fiberglass, screwed to 150 mm concrete block
PTB reference data
Original description
Wood, 19 mm, over 25 mm compressed fiberglass, screwed to 150 mm concrete block
Material properties
Thickness: 0.7 in
Backing: 1 in compressed fiberglass
Mounting: screwed to 5.9 in concrete block
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 | 0.15 | 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 |
|---|---|---|---|---|---|---|---|
| Measurement 1 | 0.10 | 0.20 | 0.15 | 0.08 | 0.05 | 0.05 | 0.05 |
Measured values as a table (1 measurement)
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