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The 3AC-509 speaker system has been produced since the beginning of 1978 by the Izhevsk Radio Factory. The AU was completing the radio "Sirius-315-pano". In the speaker placed loudspeaker type 3GD-85. The frequency range is 100 ... 10000 Hz. Resistance 4 Ohm. Speaker dimensions - 200x185x380 mm. Weight 3.8 kg.