After the inauguration of the expansion of the Danish National Gallery in 1998, a serious acoustic mishap was experienced in the new large exhibition rooms. These interconnected rooms of approx. 33,000 cubic metres (approx. 1.2 million cubic feet) were supposed to offer also a multipurpose acoustical environment for a variety of cultural events. A record-breaking reverberation time of approx. 11 seconds was measured. The acoustic redesign process included not only to the necessity of finding acoustical effective solutions; these solutions also had to be invisible or near-invisible due to the architectural requirements. This paper describes how the requirements were met, resulting in a highly acceptable reverberation time of a little more than 2 seconds.
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