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The 10AC-231 acoustic system (Sonnet) has been produced since 1986 by the Kazan Electrotechnical Plant Sviyaga. 2-way shelf speakers with bass reflex. Specifications: Frequency range: 63 ... 20000 Hz. Uneven frequency response ± 5 dB. Characteristic sensitivity level: 82 dB. Rated electrical resistance: 4 Ohms. Maximum noise (passport) power: 25 watts. Recommended power UZCH: 15 ... 25 watts. Used speakers: LF / MF: 25GDN-3-4, HF: 6GDV-2-8. Speaker dimensions - 178x155x265 mm. Weight: 4.3 kg. AS "10AS-231" were included in the set of electrofone "Sonnet EF-208S".