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Acoustic systems "Estonia-3" (the basic version) were produced since 1963 by the Tallinn plant "Punane RET". Speakers consist of three blocks (or three speakers), the main low-frequency and two high-frequency. Two 4GD-7 loudspeakers are installed in the low-frequency unit, and one 1GD-9 loudspeaker is installed in the high-frequency units. The frequency range of 60 ... 15000 Hz. Rated power input 4 watts, maximum 10 watts. Other, more detailed information yet.