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The subscriber loudspeaker Donbass-307 from I quarter of 1985 was produced by the Makeevsky factory of household products Impulse. AG "Donbass-307" is a standard subscriber loudspeaker for radio lines with a voltage of 30 V, replacing the AG "Donbass-306". The range of reproducible AFs is 160 ... 6300 Hz. Sound pressure in the frequency band - 315 ... 4000 Hz - 0.25 Pa. For more information, see the passport to the AG.