project D:Absorb

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To create the desired effect in the 8 soundscapes, panels with different material properties are used.

1: Absorbing panel

Absorbing panel consists out of MAkustik MA15-s, perforated transparant panels made out of 2 layers of PET with an air cavity in between (bottles for beverages are often fabricated out of PET). These panels are able to absorb low en middle high sound frequencies.

Properties : Because of the perforations and the cavity between the PET panels the material acquires absorbing qualities. perforations > diameter perforations 0,55 mm, the perforations are placed in a matrix of 5*5 mm, transparant > light transmittance 85%, weight > 1.5 -2 kg/m2

Fabrication : the panel can be attached, by means of screws or double-sided tape, to profiles of metal or plexiglass.

Manufacturer: Sonogamm Leuven

Above a graph with absorption values is showed. Every colour shows the absorption values at different frequency bands of two PET panels with an air cavity of a certain width in between.

2. Reflective panel

The reflective panels consist out of PET material. PET material applied as a single layer and without perforations provides reflective abilities.

Material properties PET: OctaveBands/ sound absorbing coefficient PET 125/0.20 250/0.25 500/0.20 1000/0.10 2000/0.05 4000/0.05 NRC/0.15

3.Operable panel

The operable panels are mainly situated in the reflective geometries. These operable panels are needed to guide sound into the geometries, to maintain the possibility to perceive the sound as being exagerated by means of reverberation, by changing circumstances. The material within the panels is silicone. Silicone is able to reflect sound effectively, when the panel is closed it can act as a reflective panel along with the other fixed reflective panels.

Material properties silicone: Octavebands / sound absorbing coefficient silicone : 125/0.05 250/0.05 500/0.05 100/0.05 2000/0.05 4000/0.05 NRC/0.05


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