The head worn microphone shall be extremely light weight and rugged. The capsule shall be protected against sweat and water by a drip ring. Presence boost and low cut shall improve intelligibility and environmental noise protection. In working distance the frequency response shall be linear at the low end. The microphone shall accept from 1 to 10 VDC. The response of the microphone shall be 20–20,000 Hz. The microphone shall have a sensitivity no less than 40 mV/Pa (–28 dBV), and the total harmonic distortion (THD) at an operating acoustical level of 126 dB shall be no greater than 1 %. The electrical impedance of the microphone shall be no greater than 200 ohms. The net/shipping weigth shall be 30/200 g (1.1/7.1 oz.). A windscreen shall be included. The microphone shall be the AKG C 444 L.
