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The active acoustic system "35AS-213" (S-70) was produced in the fall of 1980 by the Popov Radio Plant of Riga. AU is designed for high-quality reproduction of sound phonograms. The speaker consists of a built-in amplifier SCH with EMOS and three direct-loudspeakers. In UZCH there are tone controls on the MF and HF. When you turn off the amplifier, you can use the speaker as a passive three-way speaker. Below is the advertising of the AU in Radio â„–5.6 for 1981.