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Absorption Resonance System

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ACOUSTIC TEST FACILITIES >> ANECHOIC ROOMS>>
ABSORPTION RESONANCE SYSTEM

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Whenever lack of space does not allow the appliance of an absorbing wedge type system or exposure to dirt and contact damage may occur, the combined Absorption-Resonance System offers a suitable solution. This system offers huge benefits in terms of space. With a lining depth usually not exceeding 300mm, lower cut-off frequencies even below 50 Hz within maximum allowable deviations according to ISO 3745 can be achieved. Depending on the room size even measurements down to 30 Hz within the acoustic nearfield can be conducted.

The structure consists of a carefully engineered resonator inserted in porous absorbing material (technical foam or mineral fibre material, fire class B1 and A2 respectively). Absorption at low frequencies is done by the resonator whereas the porous material bears the medium and high frequency range. A wideband tuning of the resonator enables an acoustical performance which is evenly distributed over the whole room. The system is integrated into a robust perforated sheet metal casing which protects the absorber and can be painted or powder-coated according to customerspecification.

Precise adaptation of the single components allows the creation of anechoic or hemi-anechoic test rooms in conformance with ISO 3745; however, due to the selective effectiveness of the resonator and the low lining depth of the porous material, the absorption efficiency is not evenly distributed over the entire frequency range. In case that the room is to be used for measurements of sources that predominantly radiate pure tones, the application of this system might not be suitable and a wedge or cube system should be chosen. For technical advice about the appropriate acoustic room treatment,

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