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I need a microphone to accompany Etymotic ER-4 earphones
and would be very grateful for any recommendations.

Important points are:
* must be attached to the head in some way, as to track the head movement;
* must be comfortable enough to be used for many hours continuously, along with eyeglasses;
* flat frequency response, at least in the 100-5000 Hz range;
* must be directional to reject the relatively high equipment noise.

Anybody using Beyerdynamic Opus 54 or similar units?