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Acoustic system "3AC-312" (Ilga) was produced since 1985 by the Irkutsk Radio Plant. AS completed the radiogram "Ilga-302S". From the beginning of 1987, a similar AS with the name "15ÐС-204" was produced. Broadband closed-circuit speakers. The range of reproduced sound frequencies is 100 ... 12500 Hz. AC impedance 4 ohms. Rated power 3 watts. Ultimate long-term power - 15 watts. The speaker used 8GDSH-2-4 loudspeaker. Speaker dimensions - 380x260x210 mm. Weight 3 kg. Both loudspeakers were manufactured by the radio factory until 1991. What other devices used speakers are not installed.