WoodHighly absorbent
Data source
PTB reference data
Physikalisch-Technische Bundesanstalt
Source: Manufacturer data
Value from the PTB table, not verified
MAkustik Type 9/2 MA04 slotted acoustic panel
Type 9/2 – MAkustik MA04 continuous grooves
PTB reference data
Original description
MAkustik Type 9/2 MA04 slotted acoustic panel
Material properties
Manufacturer: MAkustik
Thickness: 1.8 in
Wall distance: 0 in
Perforation: 18% grooves (approx. 8% open)
Backing: 1.2 in mineral wool
Measurement data
Sound absorption
Reverberation chamber (ASTM C423 / ISO 354)
NRC
0.80
derived from ISO 354 lab data
Frequency values
αp nach ISO 11654
| f (Hz) | 125 | 250 | 500 | 1k | 2k | 4k |
|---|---|---|---|---|---|---|
| αp | 0.10 | 0.45 | 1.00 | 0.95 | 0.65 | 0.50 |
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Value from the PTB table, not verified
NRC: 0.80 (derived from ISO 354 lab data)
Measured values as a table (1 measurement)
| 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 46 mm · 0 | 0.80 | 0.03 | 0.12 | 0.14 | 0.32 | 0.42 | 0.65 | 0.88 | 1.07 | 1.08 | 1.08 | 0.97 | 0.85 | 0.74 | 0.66 | 0.59 | 0.53 | 0.46 | 0.45 |
Measured values as a table (1 measurement)
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