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Acoustic system "75ASP-101" was developed in 1991 by VNIIRPA them. A.S.Popova. Photos unfortunately not. The AU is designed for high-quality playback of music and speech programs in stationary living conditions. A distinctive feature of the speaker system is the use in the LF, MF and HF loudspeakers for diffusers of specially film synthetic material based on polyolefins. Specifications: 3-way floor speaker Reproducible frequency range: 40 ... 25000 Hz. Sensitivity: 89 dB. Irregularity of the frequency response in the frequency range 100 ... 8000 Hz: ± 4 dB. Recommended amplifier power: 50 ... 75 W. Harmonic distortion at a sound pressure level of 90 dB in the frequency range: 250 - 1000 Hz: 2%. 1000 - 2000 Hz: 1.5%. 2000 - 8000 Hz: 1%. Resistance: 8 ohms. Long-term power: 75 watts. Dimensions AC 670x340x330 mm. Weight 25 kg. Design features: The body is made in the form of a rectangular non-separable box made of chipboard or multilayered plywood 20 mm thick, veneered with veneer of precious wood. On the front panel symmetrically with respect to the vertical axis, there are LF, MF and HF loudspeakers, covered with decorative overlays. Internal volume of the case is 60 l. The low-frequency loudspeaker with a diameter of 250 mm has a conical diffuser of special film-based synthetic material based on polyolefins. The mid-frequency loudspeaker with a diameter of 125 mm has a conical diffuser made of the same material. The composition of this material allows for low non-linear harmonic distortion due to the suppression of the amplitudes of the diffusers' own resonances, purity and reliability of sound at high input signal levels. The tweeter has a membrane with a diameter of 25 mm, made of synthetic paper based on polyamide. The use of this material ensures the high temperature stability of this loudspeaker, as well as the purity and naturalness of its reproduction of the high-frequency part of the sound signal spectrum.Inside the case, passive electrical filter-correctors are installed, optimized on a computer and ensuring low unevenness of the frequency response of sound pressure. Section frequencies: between LF and MF heads 600 Hz, between MF and HF 4000 Hz.