Acoustic system `` 6MAS-4 '' (6AS-416).

Acoustic systems, passive or active, as well as electro-acoustic units, hearing aids, electric megaphones, intercoms ...Passive speaker systemsThe acoustic system "6MAS-4" has been produced since 1977 by the State ETZ "VEF". The speakers were completed with the VEF-101-stereo UCU. Frequency range 63 ... 18000 Hz. Weight 4.5 kg. Speaker dimensions - 280x174x190 mm. Speakers: LF / MF: 25GDN-1-4 (10GD-34), HF: 5GDV-1-8 (3GD-31). Presumably since 1982, the AU began to be called "6AS-416".