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Since 1975, the acoustic system "20AS-1" was produced by Lviv PO them. Lenin. The speakers were included in the Trembita-002S and Jupiter-Quadro amps. Designed for use with high-quality equipment. It is equipped with four 4GD-43 dynamic heads and two ЗГД-31, which are installed on the screen board, and the filter capacitor is also located there. The screen board is attached to the body, and in front of it is a decorative grille. On the rear wall of the Ac case, there is a SS-5 connector for connecting the cable. Outside the case is trimmed with fine wood and varnished. Rated power 20 W; operating frequency range 63 ... 18000 Hz; electrical resistance of 16 ohms; average standard sound pressure of 0.25 Pa; frequency response irregularity ± 6 dB: at frequencies of 125 ... 400 Hz - 5%; at frequencies above 630 Hz - 3%; AC dimensions - 444x312x258 mm; weight 10 kg. Price 90 rubles. Since 1979, according to the new GOST-AU - "20AC-1" was called as "15AS-407".