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Acoustic system "15ÐС-303Ð" (Electronics) has been produced since 1990. Specifications: 2-way shelving speakers closed type. Range of reproduced sound frequencies: 63 ... 18000 Hz. Irregularity of the frequency response of sound pressure in the frequency range 0.1 ... 8 kHz: ± 6 dB. Level of characteristic sensitivity: 85 dB. Resistance: 4 Ohms. Maximum noise (passport) power: 25 watts. Recommended amplifier power: 10 ... 25 W. The truncated loudspeaker enclosure is made of die-cast aluminum alloy. It consists of two parts: the front panel with speakers fixed on it and the back (which sets the main volume of the case). On the front panel are the loudspeaker heads. The speaker is designed for the automotive rear shelf and is mounted horizontally. Heads are protected by perforated metal grids. Inside the AU, on the printed circuit board, installed electrical filters, providing electrical separation of the low and high frequency bands of the speakers. B AU used a set of heads: LF 25GDN-4-4 and HF 4GDV-1-8.