Subscriber loudspeaker 'Donbass-304'.
Subscriber loudspeakers.DomesticSince the beginning of 1979, the subscriber loudspeaker "Donbass-304" has been produced by the Makeevsky (Ukr.) Plant of electrical appliances Impulse. The subscriber loudspeaker Donbass-304 is a standard subscriber loudspeaker for radio transmission lines with a voltage of 30 volts. The range of reproducible sound frequencies is 160 ... 6300 Hz. The average sound pressure in the band of reproducible sound frequencies is 0.25 Pa.
