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Subscriber loudspeaker "Quartz-301" from I quarter of 1999 released the PMU. Omsk software Irtysh. Subscriber loudspeaker is designed to play radio broadcasts transmitted over local wired broadcasting networks. The network voltage is 30 V. The average sound pressure is 0.20 Pa. The range of reproducible sound frequencies is 160 ... 10000 Hz. Overall dimensions of AG - 200x131x61 mm. Weight 0.61 kg.