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In this paper, a new novel sound field processing system is proposed. This sound field processing system assists listeners in perceiving audible characteristics of a given movie theater or hall, especially with regard to distance and spatial impression. To extend sound space artificially, conventional algorithms reproduce reflected sounds based on the panning law. However, even if this panning law could extend perceived listening space, it accompanies sound coloration, which reduces sound quality. Here, grouped reflections algorithm (GRA) for sound field processing is proposed to reproduce sound fields without sound coloration. Moreover, the algorithm provides higher efficiency, reducing memory requirements of the sound field processing system.