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Stereophonic headphones "Phoenix TDS-10" from the beginning of 1989 released Lviv PO named after the 50th anniversary of October. Dynamic stereo headsets '' Phoenix TDS-10 '' are intended for listening to mono and stereo programs reproduced by consumer radio equipment having a jack for connecting stereo headsets. Technical characteristics TLF: Rated electrical resistance of 8 ohms. Rated power 1 mW. The nominal frequency range is 20 ... 20000 Hz. The total harmonic coefficient in the frequency range of 100 ... 2000 Hz, with a sound pressure level of 94 dB, not more than 1%. The mass of stereo phones Phoenix TDS-10 is not more than 0.3 kg. Stereophones were available in two design options.