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Acoustic system "S-90K" was produced since 1993 by Riga JSC "Radiotehnika RRR". AU is designed for high-quality reproduction of sound phonograms in conjunction with high-end household amplification radio equipment. Specifications: Musical power - 300 watts. Rated electrical resistance of 8 ohms. Frequency range 30 ... 20000 Hz. Sensitivity 89 dB. Speaker dimensions - 915x340x280 mm. AU weight - 25 kg.