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Since the beginning of 1975, the Rubin subscriber loudspeaker has been manufactured by the Gagarin plant Dynamik. AG is a standard AG for broadcasting lines with a voltage of 30 V. The range of reproducible frequencies of sound pressure is 160 ... 6300 Hz. The average sound pressure in the sound frequency band is 0.25 Pa. Price AG - 5 rubles. Later, the plant changed the name of AG to Zenit-301.