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The loudspeaker "GR-D" since 1950 produced the Tula plant "Octava". The loudspeaker "GR-D" is designed for installation in all types of public transport, trains, buses, dispatch stations, railway stations, ships, etc. The loudspeaker has a matching transformer, with a lot of conclusions, thanks to which it can be used in any transmission lines with a capacity from 10 W to 1 kW and with a voltage from 15 to 120 volts.