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The dynamic microphone "MD-2" since 1947 allegedly produced the Leningrad Radio Products Plant. Dynamic microphone of the type "MD-2" is designed to enhance speech in places of mass presence of people, such as stations, stadiums, in various types of transport, in the production facilities for announcements. The microphone could also be used as a control loudspeaker. 1000 Ohm output impedance. The operating frequency range is 200 ... 5000 Hz. The average output voltage of the microphone is 0.1 ... 0.3 V. The microphone case of the MD-2 microphone is almost similar to the case of the 1939 subscriber loudspeaker "Kid".