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Since the middle of 1979, the subscriber loudspeaker Sphere-301 has been producing the Moscow Electromechanical Plant. Spherical subscriber loudspeaker "Sphere-301" with Olympic symbols, designed to receive radio programs transmitted over wired broadcast networks. Supply voltage 30 volts. The power input is 150 mW. The frequency range is 160 ... 6200 Hz. AH mass - 1 kg.