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The acoustic system "25ÐСÐ-101" (Static) was produced from the beginning of 1988 by the Leningrad Production Plant named after M.I. Kalinin. Broadband floor electrostatic system. Recommended amplifier power: 25 ... 100 watts. Range of reproducible speaker frequencies: 45 ... 25000 Hz. Irregularity of the frequency response of sound pressure in the frequency range 80 ... 12500 Hz: ± 2 dB. Characteristic sensitivity level: 82 dB. Harmonic distortions, determined by the total characteristic harmonic coefficient, at an average sound pressure level of 90 dB, at frequencies of 250 Hz and above: 0.5%. Rated electrical resistance: 4 ohms. Extreme noise power: 100 watts. Speaker dimensions - 615x920x365 mm. Weight 25 kg.