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The quad headphone "Electronics TDK-3" has been produced since 1979. Phones are designed for individual listening to quadra, stereo and monophonic programs from household equipment. The four-channel system allows you to play music programs more fully and vividly, creating a sense of presence in the concert hall. The telephones use four-dynamic sound emitters and there is the ability to switch operating modes, low power consumption and standard impedance allow the use of telephones with any audio reproducing radio equipment. Main characteristics: Passport power 100 mW. Input resistance is 8 ohms. The operating frequency range is 20 ... 20000 Hz. The non-linear distortion factor at a frequency of 1000 Hz and a sound pressure level of 94 dB is about 1%. Weight 0.8 kg. The phones are connected to the SG-5 jack located in the household radio equipment for connecting headphones. When using telephones in the "stereo" or "mono" modes, the corresponding connector-switch, included in the telephone set, is connected to the plug. Price phones "Electronics TDK-3" with Olympic symbols - 50 rubles.