Matched pair of 50 mm drivers for Echo orthodynamic headphones (New Old Stock)

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Matched pair of 50 mm drivers for Echo orthodynamic headphones (New Old Stock):
$30.00

You\'re offerding on a matched pair of 50 mm drivers for TDS-16 - 40Sorthodynamic headphones (New Old Stock)!
SPECIFICATIONS(for headphones):
Flat frequency response - 20-20000Hz;
Nominal output power: 1 mWatt
Impedance: 40 ohms;
Sensitivity - 91 db;
Sound pressure level at 500 Hz, in summing up the rated power, dB, not less - 91;The unevenness of the frequency characteristics of the sound pressure in the range of 20 to 20000 Hz, dB, not more than - 16;Non-uniformity between the frequency characteristics of the sound pressure of the left and right stereo headphones averaged in octave bands in the frequency range from 250 to 8000Hz, dB, not more - 3;
Harmonic distortion < 0.3%.
It is a private listing,what you see is what you buy!
Will be very well packed and promptly shipped via insured, trackable delivery.
Will ship Worldwide at buyers cost and risk -ask for a shipping cost please!