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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.
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The subscriber loudspeaker Donbass-304 is a standard subscriber loudspeaker for radio transmission lines with a voltage of 30 volts.
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The range of reproducible sound frequencies is 160 ... 6300 Hz.
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The average sound pressure in the band of reproducible sound frequencies is 0.25 Pa.
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