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Subscriber loudspeakers "Kharkiv" and "Zorya" were produced from 1962 by the Kiev Electromechanical Plant and the Nikolaev Zorya Plant. Subscriber loudspeakers "Kharkiv" and "Zorya" for design and construction are the same and are designed to play one broadcasting program transmitted via radio broadcasting wire networks with a voltage of 30 volts. Power consumption 0.15 watts. Frequency range 200 ... 4000 Hz. Input impedance is 6 kΩ. Dimensions of any model 200x100x70 mm. Weight not more than 750 grams. Were AG with round loudspeakers.