Donbass-304 1979
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Since the beginning of 1979, the subscriber loudspeaker "Donbass-304" has been produced by the Makeevsky (Ukr.) Plant of electrical household products Impulse. ,86e6f450b8cc469628ba70bf2947b049 The subscriber loudspeaker Donbass-304 is a standard subscriber loudspeaker for radio transmission lines with a voltage of 30 volts. ,86e6f450b8cc469628ba70bf2947b049 The range of reproducible sound frequencies is 160 ... 6300 Hz. ,86e6f450b8cc469628ba70bf2947b049 The average sound pressure in the band of reproducible sound frequencies is 0.25 Pa. ,86e6f450b8cc469628ba70bf2947b049 ,null,ru,null,null,null,null
Information from collection of Valery Khartchenko