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(a) Undesirable foci from an orchestra created by a concave reflector behind the platform; (b) undesirable focus created on a balcony by a concave ceiling; (c) undesirable focus created in a seating plan by a concave rear wall. Grove Music Online. Retrieved 21 Sep. 2019, from https://www.oxfordmusiconline.com/grovemusic/view/10.1093/gmo/9781561592630.001.0001/omo-9781561592630-e-8000000017.