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Acoustic systems to the radio "Estonia-Stereo" since 1970 produced the Tallinn plant "Punane-RET". The loudspeaker has three loudspeakers: LF - 5GD-3, MF - 3GD-1 and HF - 1GD-3. Rated power input 4 watts, maximum 10 watts. The frequency range of 50 ... 12000 Hz. Dimensions of one speaker - 385x900x240 mm. Weight 20 kg.