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Stereophonic headphones "Echo" produced since 1977. Phones are intended for listening of programs from home stereo radio equipment. The phones have separate volume control via stereo channels. As the sound emitters used dynamic heads 0,5GD-36. The frequency response of the heads is adjusted R / S-filters. The nominal range of reproducible sound frequencies is 20 ... 20000 Hz. The average sensitivity in the frequency range of 1.0 Pa / V. The nominal electrical resistance at 1000 Hz is 24 Ohms. The nonlinear distortion factor at a frequency of 1000 Hz at a nominal input voltage of 1%. The volume range is 20 dB. The mass of phones is 0.5 kg. Retail price of 28 rubles.