WoodLow-frequency absorber
Data source
PTB reference data
Physikalisch-Technische Bundesanstalt
Source: H. Lenz, Marktübersicht schallabsorbierende Anordnungen, Ruhr Universität Bochum, 1981, Seite 251
Value from the PTB table, not verified
Ernst Schmelze Eco-Modulator unslotted panel absorber
Eco-Modulator – unslotted
PTB reference data
Original description
Ernst Schmelze Eco-Modulator unslotted panel absorber
Material properties
Manufacturer: Ernst Schmelze KG
Thickness: 0.8 in
Wall distance: 2 in, 7.9 in
Backing: mineral fiber mat
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 | NRC0.15 | |
| 2 in | NRC0.15 |
NRC: 0.15 (derived from ISO 354 lab data)
Weight / density: 3,5 - 3,7 kg /m²
Dimensions: bis 3000 x 33 in
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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 20 mm · 3,5 - 3,7 kg /m² · 50 mm | 0.15 | 0.51 | 0.58 | 0.55 | 0.36 | 0.27 | 0.17 | 0.12 | 0.13 | 0.07 | 0.06 | 0.10 | 0.05 | 0.09 | 0.09 | 0.09 | 0.09 | 0.13 | 0.17 |
| 20 mm · 3,5 - 3,7 kg /m² · 200 mm | 0.15 | 0.78 | 0.54 | 0.33 | 0.31 | 0.23 | 0.17 | 0.10 | 0.13 | 0.15 | 0.10 | 0.12 | 0.08 | 0.09 | 0.12 | 0.13 | 0.21 | 0.18 | 0.17 |
Measured values as a table (2 measurements)
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