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Acoustic systems "15ÐС-6", "15ÐС-506", "15ÐС-306" have been produced respectively since 1979, 1983, 1987 by the experimental plant of VNIIRPA named after Popova, St. Petersburg and the Kirovograd plant of radio products. All speakers are the same, the difference in factories, GOST-ah, design and tweeters. 2-way shelf speakers of the closed type. A special feature of the AU is that by design and parameters they belong to the "mini" class, providing good bass reproduction at small sizes. The frequency range is 100 ... 20000 Hz. Sensitivity 78 dB. The uneven frequency response of sound pressure in the frequency range 250 ... 8000 Hz about ± 6 dB. Harmonic distortion 3 ... 4%. 4 ohm impedance. Recommended power UZCH 15 watts. Used speakers: LF / MF: 15GD-13, HF: 3GDV-1 (or 2GD-36, or 6GDV-2). The frequency section of the filter is 2000 Hz. Sizes of the EXPERT 200Ñ…140Ñ…130 mm. Weight 1.9 kg. Photos of speaker systems from the forum RT-20 and from online stores.