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Three-way acoustic systems "S-90F" and "S-100F" have been produced since 1991 by the Riga Radio Plant them. A.S.Popova. Speakers are designed for high-quality sound reproduction as a part of consumer electronics. The AU used dynamic heads of direct radiation: HF 6GDV-6-25, LF 75GDN-1-8. AS "S-90F" contain mid-frequency head 20GDS-1-16, and "S-100F" - 30GDS-3 with magnetic fluid MAXID, which allows you to increase the power of the speaker to 100 watts. The speakers have two smooth playback level controls for midrange and treble. The adjustment limits are from 0 to -6 dB in the range of 500 ... 5000 Hz and 5 ... 20 kHz. In the "-6 dB" position, the signal is attenuated by 2 times. The speaker has an LED indication of loudspeaker overloads. Main technical characteristics: Passport power 90 and 100 W, respectively. Rated electric power 35 watts. Rated electrical resistance of 8 ohms. The frequency range is 25 ... 25000 Hz. Characteristic sensitivity in the range of 100 ... 8000 Hz with a power of 1 W not less than 89 dB. Overall dimensions of any speaker are 710x360x285 mm, weight - 23 kg.