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The subscriber loudspeaker "North" since 1952 produced the Tomsk plant of measuring equipment. Class 4 standard subscriber loudspeaker according to GOST 5961-51 for a 30-volt radio-broadcast network. Volume control, provides its change by 20 dB. Rated power consumption 0.2 watts. Band of reproduced sound frequencies 250 ... 3000 Hz. Input impedance 4.5 kOhm. Dimensions AH - 230x300x110 mm. Weight 2.5 kg. For the Moscow city network, the loudspeaker was produced at a voltage of 15 volts.