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Since 1977, the Donbass-301 subscriber loudspeaker has been producing the Makeevsky factory of household appliances "Impulse". '' Donbass-301 '' is a standard subscriber loudspeaker for radio lines with a voltage of 30 V. The range of reproducible sound frequencies is 160 ... 5000 Hz. Irregularity of the frequency response of not more than 15 dB. The average sound pressure in the reproduced frequency band is 0.25 Pa. Rated power input 150 mW. Input impedance is 3.6 kΩ. The dimensions of the loudspeaker are 260x150x74 mm. Weight 1.1 kg. To increase the range of products, the plant until 1980 produced the loudspeakers Donbass, Donbass-301, as well as all subsequent ones in parallel.