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The subscriber loudspeaker "Ala-Tau" has been producing the Alma-Ata software "Kzyl Tu" since 1971. This is a standard 3rd class subscriber speaker. Input voltage 30 V. Power consumption 0.15 W. The average sound pressure is 0.25 Pa. The frequency range for sound pressure is 160 ... 5000 Hz. Frequency response unevenness - 15 dB. Input impedance 3600 Ohm. THD at a frequency of 400 Hz - 8%. Dimensions AH 200x198x75 mm. Weight 900 gr. The price is 5 rubles. The first issues came with a cardboard back wall, then presumably since 1974 with plastic. The AG volume knob in the first three photos is not standard.