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The Rostov-Don-101-stereo surround sound system was manufactured in 1976 by the Rostov Electroapparat plant. The system consists of a multi-purpose control unit and four two-way 6ACL-1 loudspeakers of a labyrinth type. It provides listening to mono programs with surround sound effect and stereo programs with enhanced stereo effect. Signal sources can be a tape recorder, a turntable or a radio receiver (tuner). Technical characteristics of the UKU: Nominal frequency range 40 ... 18000 Hz. Irregularity of the frequency response in the nominal frequency range of 2 dB. Output power of each channel at a load of 4 0m; rated 10 watts, maximum 15 watts. The harmonic coefficient of electrical voltage at rated output power in the nominal frequency range of 1%. The relative level of interference is not more than, from the input: a ceramic pickup and tape recorder -60 dB, a magnetic pickup and a tuner -50 dB. Sensitivity from the input: a pickup and a tape recorder 200 ... 250 mV, a magnetic pickup 3 ... 5 mV, a tuner 20 ... 25 mV. The limits of tone control at frequencies of 63 Hz and 16 kHz are not less than ± 10 dB. Limits of smooth volume control not less than 60 dB. Gradual attenuation of the volume of at least -15 dB. The phase mismatch of the output voltages between the stereo channels in the range of 1 ... 6 kHz is 90 degrees. Damping factor 8. The power consumption of 150 watts from the mains. Dimensions 530x355x136 mm. Weight 16.5 kg. Technical specifications of the 6ACL-1 loudspeaker. Rated power 6 watts. Effectively reproducible frequency range, with uneven frequency response 15 dB - 63 ... 18000 Hz. Rated input resistance 4 0m. The average standard sound pressure is 0.1 Pa. The total harmonic coefficient of 3%. Dimensions of one speaker -170x285x430 mm. Weight - 7 kg.