Sound systems in large halls such as departing and arrival halls in airports and railway stations, have to operate ip relatively high and continuously changing background noise. For reasons of economy and listening comfort it is desirable to design a sound system with the lowest possible signal to noise ratio without sacrificing intelligibility. This paper deals with the design of such a usually distributed sound system in different room acoustical conditions, focusing at the array effects of the reverberation time on signal to noise ratio (due to feedback effects on vocal output of people) and the reverberation time perceived from distributed loudspeaker systems.
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