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Since 1961, a subscriber loudspeaker "Echo" has been producing the Moscow Electrical Products Plant No. 6. The AG is designed to operate in a broadcast wired radio network with a voltage of 30 volts. A speaker feature is a manually set calendar. Input impedance 4800 ohms. The range of reproduced sound frequencies is 160 ... 5000 Hz. The average sound pressure is 2.5 bar. The loudspeaker was also produced under the name "EMZ". White AG from the collection of D.N. Guryanov. Mytishchi. Other photos of the Young Technique AG (nickname on the forums), St. Petersburg and from the forum http://www.forum.odlr.ru/