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The acoustic system "6ÐС-15" has been produced since 1977 at the Vilma instrument-making plant Vilma. Since 1978, the AU has been produced as "6ÐС-415", and since 1979 as "15ÐС-3". The two-way bass-reflex speaker was supplied with the Ruta-201 tape recorder, with other devices and separately. The design of the speakers are the same, but because of the different loudspeakers used, they have different power. The frequency range is 63 ... 20000 Hz. Electric resistance 4 Ohm. Rated power 7.5 (15 W for AC 15AS-3). Extreme noise power: 20/25 watts. Speaker dimensions - 259x169x423 mm. Weight 8 kg (for the first two speakers).