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The acoustic system "S-90B" has been produced since 1987 by the Riga Production Association "Radio Engineering". The AU is designed for high-quality playback of music and speech programs in stationary living conditions. "S-90B" is a later model "S90", characterized by an extended range of operating frequencies, the introduction of an indication of electrical loudspeaker overload and a new look. The recommended power of a high-quality domestic amplifier is 20 ... 90 W. Product specifications: 3-way floor speaker with bass reflex. Frequency range: 25 ... 25000 Hz. Irregularity of the frequency response in the range of 100 ... 8000 Hz: ± 4 dB. Sensitivity: 89 dB. Harmonic speaker distortion at a sound pressure level of 90 dB at frequencies: 250 ... 1000 Hz: 2%. 1000 - 2000 Hz: 1.5%. 2000 - 6300 Hz: 1%. Resistance: 8 ohms. Extreme (passport) power: 90 watts. AC dimensions - 710x360x285 mm. Weight 23 kg. Installed speakers: LF: 75GDN-1-8. LF: 20GDS-1-16. HF: 6GDV-6-25.