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The page covers why Subways are better at reflecting sound waves, allowing sound pressure (volume) levels to build up naturally, with no need for microphones or loudspeakers. This makes them appealing alternative performance areas.
%0 Electronic Source %A Case, Alex %D 2004 %T Sounds of the Subway %V 2016 %N 28 July 2016 %9 text/html %U http://www.aps.org/publications/apsnews/200412/subway.cfm
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