Abstract:
In this paper, the resonator system of controlling the reverberation time is examined in an existing hall with 500 seats and the room volume of 4160 m[sup 3]. The cavity of each chair with the volume of 0.012 m[sup 3] was utilized as a resonator. Four holes of a 30-mm diameter in the lower board of chairs can be opened or closed by a sliding plate. By use of such a system of chairs, the reverberation time at the low-frequency range in the hall could be controlled as: at 100 Hz: 1.93--1.58 s; at 125 Hz: 1.69--1.44 s; at 160 Hz: 1.54--1.36 s, and at 200 Hz: 1.52--1.45 s.