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The subscriber loudspeaker Donbass-4 since 1970 has been producing the Makeevsky factory of household products Impulse. Subscriber loudspeaker Donbass-4 is a standard subscriber loudspeaker for radio transmission lines with a voltage of 30 volts. The frequency range is 160 ... 6300 Hz. The average sound pressure in the reproduced frequency band is 0.25 Pa. Since 1979, the plant produced the same loudspeaker, with the name "Donbass-304".