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The acoustic system "4ÐС-4" was produced from the 1st quarter of 1969 by the Riga Radio Plant named after them. Popova, and later the Chelyabinsk Radio Plant. The speaker was part of the Accord series of electrophones. The loudspeaker used 4GD-35 broadband. The frequency range of 80 ... 12500 Hz. Rated power input 4 W, maximum 8 watts. Resistance is 5 Ohms. Speaker dimensions - 365x270x140 mm. Weight - 2.5 kg. Read more on the pages of Accord series electrophones.