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The acoustic system "6MAS-4" has been produced since 1977 by the State ETF "VEF". The AU was equipped with the VEF-101-stereo UCU. The frequency range 63 ... 18000 Hz. Weight 4.5 kg. Dimensions AU - 280h174h190 mm. Dynamics: LF / MF: 25GDN-1-4 (10GD-34), HF: 5GDV-1-8 (3GD-31). Presumably since 1982, the AU began to be called "6ÐС-416".