One of these rooms was equipped with the highly absorbent G+H flat absorber cladding “Type Sonex WF 350” as a semi-open-plan room. The second room was designed as a full room with G+H wedge absorber “Type Asonad MF”. Here, the tensioning frame as well as the walking and catching net and a removable grating level were also included in the G+H scope of delivery.