WoodLow-frequency absorber
Data source
PTB reference data
Physikalisch-Technische Bundesanstalt
Source: Herstellerunterlagen
Value from the PTB table, not verified
ESO MODULATOR 22/3 plywood ceiling facing with mineral wool
ESO MODULATOR 22/3
PTB reference data
Original description
ESO MODULATOR 22/3 plywood ceiling facing with mineral wool
Material properties
Manufacturer: ESO-Akustik Brigitte Schmelzle
Thickness: 0.2 in
Wall distance: 7.9 in (filled), 2 in (filled)
Measurement data
Sound absorption
Reverberation chamber (ASTM C423 / ISO 354)· 2 variants
NRC
0.15
Frequency values
αp per octave band
| f (Hz) | 125 | 250 | 500 | 1k | 2k | 4k |
|---|---|---|---|---|---|---|
| αp | 0.55 | 0.25 | 0.15 | 0.10 | 0.10 | 0.20 |
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| Compare | Value | |
|---|---|---|
| 7.9 in (gefüllt) | NRC0.15 | |
| 2 in (gefüllt) | NRC0.15 |
NRC: 0.15 (derived from ISO 354 lab data)
Application: Holzrahmenkonstruktion
Measured values as a table (2 measurements)
| Build-up | NRC | 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 5 mm · 200 mm (gefüllt) · Holzrahmenkonstruktion · geschlossene Holzoberfläche | 0.15 | 0.78 | 0.54 | 0.35 | 0.32 | 0.23 | 0.18 | 0.10 | 0.13 | 0.16 | 0.09 | 0.12 | 0.08 | 0.10 | 0.12 | 0.13 | 0.22 | 0.18 | 0.18 |
| 5 mm · 50 mm (gefüllt) · Holzrahmenkonstruktion · geschlossene Holzoberfläche | 0.15 | 0.53 | 0.58 | 0.55 | 0.35 | 0.27 | 0.17 | 0.13 | 0.13 | 0.08 | 0.07 | 0.10 | 0.07 | 0.10 | 0.09 | 0.09 | 0.08 | 0.12 | 0.18 |
Measured values as a table (2 measurements)
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