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The acoustic system "6ÐС-221" (Radiotehnika S-20A) has been produced since 1984 by the Riga software company "Radio Engineering". The AU was included in the set of the radio "Radiotekhnika-301S". 2-way shelf speakers of the closed type. The frequency range is 80 ... 12500 Hz. Sensitivity 84 dB. Resistance 4 Ohm. Rated power AC - 6 W, passport 30 W. Dynamics: LF / MF: 25GDN-1-4 (in the first speakers - 10GD-34). HF: 6GDV-1-16 (in the first speakers - 3GD-2). The frequency of the filter section is 5000 Hz. The sizes of the speakers are 364x214x195 mm. Weight - 6 kg.