Reference surfaceLow-frequency absorber
Data source
PTB reference data
Physikalisch-Technische Bundesanstalt
Source: DNA-Tabelle 1968, c1-9
Value from the PTB table, not verified
Drywall, 12.5 mm, 11 kg/m², on 24/48 mm sub-frame, 400 mm wall distance, empty (DNA 1968, c1-9)
PTB reference data
Original description
Drywall, 12.5 mm, 11 kg/m², on 24/48 mm sub-frame, 400 mm wall distance, empty (DNA 1968, c1-9)
Material properties
Thickness: 12.5 mm
Wall distance: 400 mm
Dimensions: 1500 × 1250 mm
Surface weight: 11 kg/m²
Mounting: on 24/48 mm sub-frame, 420 mm grid
Measurement data
Sound absorption
ISO 354 – reverberation chamber
αw
0.05
Frequency values
αp nach ISO 11654
| f (Hz) | 125 | 250 | 500 | 1k | 2k | 4k |
|---|---|---|---|---|---|---|
| αp | 0.15 | 0.10 | 0.05 | 0.05 | 0.05 | 0.05 |
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Value from the PTB table, not verified
Measured values as a table (1 measurement)
| Build-up | αw | 100 Hz | 125 Hz | 160 Hz | 200 Hz | 250 Hz | 315 Hz | 400 Hz | 500 Hz | 630 Hz | 800 Hz | 1000 Hz | 1250 Hz | 1600 Hz | 2000 Hz | 2500 Hz | 3150 Hz | 4000 Hz | 5000 Hz | 6300 Hz |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 12,5 mm · 11 kg / m² · 400 mm | 0.05 | 0.18 | 0.14 | 0.15 | 0.13 | 0.09 | 0.09 | 0.07 | 0.05 | 0.06 | 0.03 | 0.03 | 0.03 | 0.02 | 0.05 | 0.05 | 0.07 | 0.00 | 0.07 | 0.00 |
Measured values as a table (1 measurement)
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