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
Plywood panel, 1/4 inch, mounted over 3 inch air space, with 1 inch glassfiber batts right behind the panel
PTB reference data
Original description
Plywood panel, 1/4 inch, mounted over 3 inch air space, with 1 inch glassfiber batts right behind the panel
Material properties
Thickness: 1/4 inch
Wall distance: 3 inch
Backing: 1 inch glassfiber batts
Measurement data
Sound absorption
ISO 354 – reverberation chamber
αw
0.10
Frequency values
αp nach ISO 11654
| f (Hz) | 125 | 250 | 500 | 1k | 2k | 4k |
|---|---|---|---|---|---|---|
| αp | 0.60 | 0.30 | 0.10 | 0.10 | 0.10 | 0.10 |
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Value from the PTB table, not verified
Measured values as a table (1 measurement)
| Build-up | αw | 125 Hz | 250 Hz | 500 Hz | 1000 Hz | 2000 Hz | 4000 Hz |
|---|---|---|---|---|---|---|---|
| Measurement 1 | 0.10 | 0.60 | 0.30 | 0.10 | 0.09 | 0.09 | 0.09 |
Measured values as a table (1 measurement)
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