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Since 1951, the Siberian subscriber loudspeaker has been producing the Tomsk Instrumentation Plant. The loudspeaker is designed to sound the radio programs transmitted over local radio broadcasting radio networks. The voltage in the radio network is 30 volts. The brought power is 0,25 W. Frequency range 150 ... 5000 Hz. Frequency response unevenness - 20 dB. The average sound pressure is 1.5 bar. Harmonic coefficient 7%. Dimensions AH - 210x170x80 mm. Weight 1.1 kg. The loudspeaker was produced in several design options. The first main one is the first row of photographs, the second with radio fabric and the third in a rectangular design. AG in its latest design since 1952 became known as the "North".