The listener in the audience expects satisfactory acoustic conditions which lead to an overall judgement of the acoustics of the hall. When we compare a sound recording made in the hall with the original condition we frequently find an improved room impression, a better balance between the individual sections of the orchestra and a distinctly improved word intelligibility. This paper considers how far the recorded version differs from the original and how the difference is affected by the microphone positions and technical aids in the control room. The more important question is concerned with the improvement of the acoustic conditions in the hall itself by modifying the building or by electroacoustic aids. The use of loudspeakers to lengthen the reverberation time and to provide additional artificial sound reflections will be described.
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