The MDM-4 is a compact dynamic microphone purpose-built for communication systems rather than studio audio: intercoms, dispatch consoles, public address stations, transport and industrial communication equipment. Its specification set is shaped for speech intelligibility and integration into OEM hardware — a 150–7,000 Hz frequency range covering the voice band, sensitivity of 0.35–0.9 mV/Pa at 1 kHz, total electrical impedance of 220–350 ohms at 1 kHz, and 10 dB axial directivity at 150 Hz that helps reject off-axis noise in loud environments.
Reliability figures matter more than fidelity in this category: the manufacturer declares 15,000 hours mean time to failure and backs the unit with a 3.5-year warranty. At 36 × 12.5 mm with a 24 mm diaphragm section and just 20 g of mass, the microphone embeds easily into handsets, panels and consoles.
Supplied from 500 pieces at about 3 USD each, it addresses communication equipment manufacturers, transit system integrators and maintenance organisations stocking spares.
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