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The Donbass-305 subscriber loudspeaker was manufactured in I-q 1982 by the Makeevsky factory of household appliances "Impulse". Model '' Donbass-305 '' is a standard subscriber loudspeaker designed to work in radio transmission lines with a voltage of 30 V. The range of reproducible sound frequencies 160 ... 6300 Hz. The average sound pressure in the band reproduced sound frequencies of 0.25 Pa.