Electret Microphone
Besides protecting hearing, a headset's job is to make communication inside and outside the cockpit clearer. The microphone accomplishes that task. The quality of a headset's microphone influences price and can make a huge difference in transmission quality and clarity. While most midpriced aviation headsets use dynamic microphones, the king of the hill is the electret microphone.
Noise-cancelling electrets are typically found in the upper-end models from various manufacturers. Some headset companies offer upgrades that let an owner swap out cheaper dynamic mics for noise-cancelling electret microphones. The sound quality of electret mics is excellent, and the ability to block noise makes them the perfect solution for open cockpits and other loud environments. Some pilots say electret mics also provide that "airline" sound.
Excerpt from Plane & Pilot Magazine: "Headset How-To" by Marc C. Lee. Click for entire article.
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