Acoustic systems of the radio "Estonia-3".

Acoustic systems, passive or active, as well as electro-acoustic units, hearing aids, electric megaphones, intercoms ...Passive speaker systemsThe acoustic systems of the Estonia-3 radio (basic version) have been produced since 1963 by the Punane RET Tallinn plant. The speakers consist of three blocks (or three speakers), the main low-frequency and two high-frequency ones. The LF unit has two 4GD-7 loudspeakers, the HF units have one 1GD-9 loudspeaker each. The range of reproducible frequencies is 60 ... 15000 Hz. Rated input power 4 W, maximum 10 W. There is no other, more detailed information yet.