WoodBroadband absorber
Data source
PTB reference data
Physikalisch-Technische Bundesanstalt
Source: Manufacturer's product sheet
Value from the PTB table, not verified
n'H Akustik Topperfo perforated panel with fiber absorber
Topperfo – 16/16/12-2
PTB reference data
Original description
n'H Akustik Topperfo perforated panel with fiber absorber
Material properties
Manufacturer: n'H Akustik + Design AG
Wall distance: 200 mm
Perforation: 15 % / 44 %
Hole size: 12 mm rear and 2 mm front
Backing: acoustic non-woven 60 g/m²
Measurement data
Sound absorption
ISO 354 – reverberation chamber
αw
0.25
Frequency values
αp nach ISO 11654
| f (Hz) | 125 | 250 | 500 | 1k | 2k | 4k |
|---|---|---|---|---|---|---|
| αp | 0.60 | 0.85 | 0.70 | 0.50 | 0.20 | 0.10 |
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Value from the PTB table, not verified
Measured values as a table (1 measurement)
| Build-up | αw | 125 Hz | 250 Hz | 500 Hz | 1000 Hz | 2000 Hz | 4000 Hz |
|---|---|---|---|---|---|---|---|
| 200 mm | 0.25 | 0.60 | 0.85 | 0.70 | 0.51 | 0.21 | 0.08 |
Measured values as a table (1 measurement)
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