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The subscriber loudspeaker "Sphere-301" since 1979 let out the Moscow plant of Electromechanisms. Spherical subscriber loudspeaker `` Sphere-301 '' with Olympic (or other) symbols is designed to receive radio programs transmitted over local wired radio broadcast networks. The applied voltage is 30 (15) volts. The brought power - 150 mW. The range of reproduced frequencies of sound is 160 ... 6200 Hz. AG mass - 1 kg.