Broadcast quality noise-cancelling ‘lip’ microphone, specifically for commentary work in environments where the level of background noise requires that the microphone be used very close to the mouth. It is a gradient ribbon unit with a high degree of acoustic damping, fitted into a special case equipped with nose and mouth breath shields. The talking distance has to be controlled accurately in order to maintain the correct frequency response (avoidance of variation of proximity effect) and this is done by positioning bars which contact the user’s upper lip. Noise reduction is achieved partially through the polar response and partially through the substantial LF roll-off characteristics of the free-field response of the ribbon unit (which is optimised for a flat near-field response). The speech quality is good, mainly due to the correct balance being obtained between the nose and the mouth tones - any deficiency of the former gives a ‘stuffy’ and unnatural speech quality.
The breath shields are corrosion free stainless steel mesh, and the microphones incorporate a high degree of shielding against sources of electromagnetic induction, such as television monitors.
The frequency response is 60-12000Hz, and impedance 300ohms. Distortion is less than 1% at an SPL of 120dB. An XLR 3 pin male connector is incorporated in the base of the handle. Dimensions:200(l) × 57(max.w) × 76(max.d). Weight 283g.
A plastic clip-on hygiene screen is available for this microphone, which can be washed and reused, or thrown away.
4104 lip microphone with press-to-talk (“PTT”) switch in the handle, for occasions when a continuous commentary is not required. Switch contacts are normally closed across pins 2 and 3 of the connector to mute the output. Operating the switch un-mutes the microphone without clicks.