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Since the beginning of 1986, the 15AC-315 speaker system has been produced by the Gagarin plant Dinamik. The speaker is designed to play phonograms and can work from any audio-frequency control unit, stationary or autonomous. The design of the AU is made in the form of a closed box, where two 4GD-56 and 15GD-18 heads are installed. A distinctive feature of the AU is its relationship to the class of '' MINI '' type systems, which gives low frequency reproduction from 60 Hz for small size. Rated power - 15 W, passport - 20 W. Electrical resistance 4 ohm. The range of reproduced sound frequencies is 63 ... 20000 Hz. Sound pressure at rated power not less than 0.8 Pa. The total harmonic coefficient of not more than 4%. Speaker dimensions - 213x140x150 mm. Weight 3 kg.