Subscriber loudspeaker "Zarya".
Subscriber loudspeakers.DomesticThe subscriber loudspeaker "Zarya" (loudspeaker) from 1929 to 1939 was produced by the Irkutsk Relay Plant. The Zarya electromagnetic loudspeaker has a high-impedance coil and is designed for direct connection to a 15 or 30 volt radio transmission line, without an adapter transformer. The loudspeaker does not have a volume control. Input impedance 3 kOhm. The range of reproducible sound frequencies is 300 ... 3000 Hz. Average sound pressure at a line voltage of 15 V - 0.5 bar, 30 V - 1 bar.
