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The acoustic system "25AS-202" (Sonnet) was produced from I quarter of 1986 by the Kazan Electrotechnical Plant Sviyaga. 2-way shelf speakers with bass reflex. It was part of the sonnet-208-stereo. Frequency range: 63 ... 20000 Hz. Irregularity of the frequency response of sound pressure in the frequency range 100 ... 8000 Hz: ± 5 dB. Characteristic sensitivity level: 82 dB. Harmonic distortions of the AU, determined by the total characteristic harmonic coefficient, at the level of the average sound pressure of 90 dB, at frequencies: 250 - 1000 Hz: 2%. 1000 - 2000 Hz: 2%. 2000 - 6300Hz: 2%. Rated electrical resistance: 4 ohms. Maximum noise (passport) power: 25 watts. Recommended amplifier power: 15 ... 25 W. Used speakers: LF / MF: 25GDN-3-4. HF: 6GDV-2-8. Speaker dimensions - 178x155x265 mm. Weight 4.3 kg.