Subscriber loudspeaker `` Donbass-4 ''.

Subscriber loudspeakers.DomesticSince 1970, the subscriber loudspeaker "Donbass-4" has been producing the Makeevka plant of electrical household products "Impulse". The subscriber loudspeaker Donbass-4 is a standard subscriber loudspeaker for radio transmission lines with a voltage of 30 volts. The range of reproducible frequencies is 160 ... 6300 Hz. The average sound pressure in the reproducible frequency band is 0.25 Pa. Since 1979 the plant has been producing the same loudspeaker named "DONBASS-304".