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Acoustic system "35AS-212" (Radiotehnika S-90) has been produced since the beginning of 1980 by PO "Radioengineering". Since 1984, the new GOST AS has been referred to as "35AS-012". The AU is designed for high-quality playback of music and speech programs in stationary living conditions. AS "35AS-212" are the first in the USSR that meets the world requirements of "Hi-Fi" acoustics. The designation of acoustic systems in the production process changed. The model was first designated as "35ÐС-212", and after replacing the GOST it was already designated as "35ÐС-012". Intensifying external marketing, it was decided to assign to the AU the trade name "S-90", where S denoted "system" and 90 - power in watts. The range of reproduced sound frequencies is 31.5 ... 20000 Hz. Irregularity of the frequency response in the range of 100 ... 8000 Hz - ± 4 dB. Sensitivity 85 dB. The harmonic distortion of the speakers at a sound pressure level of 90 dB at frequencies: 250 - 1000 Hz: 2%. 1000 - 2000 Hz: 1.5%. 2000 - 6300 Hz: 1%. 4 ohm impedance. Rated power 35 watts. The maximum (passport) power of 90 watts. Speaker dimensions - 710x360x285 mm. Weight 23 kg. Weight: 23 kg. Installed speakers: LF: 75GDN-1-4. LF: 20GDS-1-8. HF: 6GDV-6-16.