Echo stereo headphones.
Headphones, headphones, headsets ...Echo stereo headsets have been produced since 1977. Telephones are designed to listen to programs from household stereo radio equipment. The phones have separate volume control for stereo channels. Dynamic heads 0.5GD-36 are used as sound emitters. The frequency response of the heads is corrected by R / C filters. The nominal range of reproducible sound frequencies is 20 ... 20,000 Hz. Average sensitivity in the range of reproducible frequencies 1.0 Pa / V. The nominal electrical resistance at 1000 Hz is 24 ohms. Total harmonic distortion at a frequency of 1000 Hz at a nominal input voltage of 1%. Volume control range 20 dB. The weight of the phones is 0.5 kg. Retail price 28 rubles.