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(a) Geometrical construction used to determine the plane of a reflector in (c) and (d); (b) paths of direct sound, and several reflected sound waves in a 19th-century concert hall with traditional horizontal floor and ceiling and parallel side walls (the. Grove Music Online. Retrieved 20 Sep. 2019, from https://www.oxfordmusiconline.com/grovemusic/view/10.1093/gmo/9781561592630.001.0001/omo-9781561592630-e-8000000020.