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Microphone dynamic compact "MDM-1" was produced presumably since 1957 by the Odessa factory "Red October". The microphone is designed for use in household recording. The nominal range of working sound frequencies is 100 ... 5000 Hz. Irregularity of the frequency response of 12 dB. Output impedance is 3 kΩ. Sensitivity 2.5 mV. Unidirectional. Microphone dimensions are 67x98 mm. Weight 800 gr.