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The acoustic system "15AS-303A" (Electronics) has been produced since 1990. Specifications: 2-way bookshelf speaker closed. Frequency Response Range: 63 ... 18000 Hz. Uneven frequency response of sound pressure in the frequency range 0.1 ... 8 kHz: ± 6 dB. Level of characteristic sensitivity: 85 dB. Resistance: 4 ohms. Ultimate noise (passport) power: 25 watts. Recommended amplifier power: 10 ... 25 watts. The truncated speaker housing is made of an aluminum alloy by injection molding. It consists of two parts: the front panel with speakers fixed to it and the back (which sets the main body volume). On the front panel are the speaker heads. The speaker is designed for the automotive rear shelf and is mounted horizontally. The heads are protected by perforated metal mesh. Inside the speakers, on the printed circuit board, electric filters are installed that provide electrical separation of the bass and treble bands of the speakers. A set of heads was used in the AC: LF 25GDN-4-4 and HF 4GDV-1-8.