The State opera Unter den Linden was built as the first detached court opera building in Europe in 1742. The building was severely damaged several times in history (1842,1942,1945) and also restored or renovated several times (1788,1910,1928,1986). The in 2009 existing situation was created after the war, in 1955. In the period from 2010 to 2017 the building was fully renovated and all technical equipment renewed. A new rehearsal building was realised with 7 rehearsal halls, including a choir rehearsal hall and an orchestra rehearsal hall. The historic opera hall has 1350 seats and a small hall with a flat floor: the beautiful Apollosaal. This paper concentrates on the acoustical aspects of the renovation of the opera hall. Starting points of the renovation are a substantial improvements of the room acoustic of the hall, at the same time preserving the architectural design and monumental status of the hall. Since the acoustic of the hall results from the geometry and the architecture, this is a contradiction in requirements. In this paper we describe the steps in the acoustical design and the results after realisation.
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