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Orthodynamic stereo head phones "ECHO TDS-16" (type H16-40C) have been produced since 1985 in Kiev.
Phones are designed for high-quality listening to mono and stereo phonograms.
Brief technical characteristics: Range of reproducible frequencies 20 ... 20,000 Hz;
nominal resistance 40 Ohm;
rated input power 1 mW;
passport power 750 mW;
sound pressure level at a frequency of 500 Hz when summing up the rated power of at least 91 dB;
uneven frequency response of 16 dB;
total harmonic coefficient 0.3%.
Overall dimensions - 220x170x68 mm.
Weight 300 gr.