Stone & concreteLow-frequency absorber
Data source
PTB reference data
Physikalisch-Technische Bundesanstalt
Source: Manufacturer data unter http://asonad.de, March 2002
Value from the PTB table, not verified
Asona Soundblox Helmholtz resonator Type C2
Helmholtz resonator – SOUNDBLOX Type C2
PTB reference data
Original description
Asona Soundblox Helmholtz resonator Type C2
Material properties
Manufacturer: Asona Deutschland GmbH
Up to fire class: F-180
Measurement data
Sound absorption
Reverberation chamber (ASTM C423 / ISO 354)
NRC
0.65
derived from ISO 354 lab data
Frequency values
αp nach ISO 11654
| f (Hz) | 125 | 250 | 500 | 1k | 2k | 4k |
|---|---|---|---|---|---|---|
| αp | 1.00 | 0.85 | 0.70 | 0.60 | 0.60 | 0.65 |
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Value from the PTB table, not verified
NRC: 0.65 (derived from ISO 354 lab data)
Measured values as a table (1 measurement)
| Build-up | NRC | 63 Hz | 80 Hz | 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 | 8000 Hz |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Measurement 1 | 0.65 | 0.20 | 0.43 | 0.92 | 1.19 | 1.06 | 0.98 | 0.82 | 0.77 | 0.71 | 0.69 | 0.73 | 0.69 | 0.60 | 0.54 | 0.52 | 0.55 | 0.67 | 0.72 | 0.64 | 0.57 | 0.61 | 0.56 |
Measured values as a table (1 measurement)
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