Abstract
In an attempt to reduce sound entering communities surrounding a large open‐air amphitheatre during rock concerts, a study was made of the loudspeaker system. A constraint on the problem was a lack of flexibility in locating, orienting, and phasing the speaker systems. To redirect some of the energy spilling out of the amphitheatre, large reflecting panels were mounted above the speakers extending upwards at a slight angle. A series of measurements were made to test a prototype panel. Tower mounted speakers were driven with octave bands of random noise between 500 Hz and 4 KHz. The measurement microphone was placed on a tower extendable from 10 to 50 ft, thereby allowing measurements from 5° below to 25° above the horizontal speaker axis. The results of these measurements indicated a potential reduction of A‐weighted noise levels in the community of 3 to 4 dB with no apparent effect upon sound levels in the amphitheatre seating area.
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