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Creation of an echo by (a) a reflector more than 13·5 m behind the source of sound; (b) a reflector more than 13·5 m behind the listener; (c) a difference in sound paths of more than 27 m; (d) flutter echo produced by sound reflected from two parallel sur
Creation of an echo by (a) a reflector more than 13·5 m behind the source of sound; (b) a reflector more than 13·5 m behind the listener; (c) a difference in sound paths of more than 27 m; (d) flutter echo produced by sound reflected from two parallel sur