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The subscriber loudspeaker "EMZ" since 1957 produced the Moscow Electromechanical Plant. The subscriber loudspeaker "EMZ" type 0.25GD-III-2, later 0.25GD-III-3 is designed to work in a broadcast radio network with a voltage of 30 volts. The band of sound frequencies is 150 ... 5000 Hz. For Moscow, the loudspeaker was produced for a voltage of 15 volts.