ABSTRACT
But electroacoustical systems in rooms are by far more than a necessary evil. They open acoustical design possibilities which would be inconceivable with traditional means of room acoustical treatment. Electroacoustical systems for reverberation enhancement simulate acoustical conditions that are not encountered in the given hall as it is. This chapter discusses acoustical feedback in a more detailed manner in the next section. The listener benefits from the law of the first wavefront, which raises the illusion that all the sound he hears is produced by the natural sound source, that is, no electroacoustical system is in operation. The electroacoustical system consists of 54 dynamic microphones and 104 loudspeakers. For this reason, an electroacoustical system for increasing the reverberation time was installed in 1964; at first, this was on an experimental basis, but in the following years several aspects of the installation have been improved and so it has been made a permanent fixture.
