Premium head-worn microphone Handfree use Lead and backing vocals Lectern Intercom systems Head-worn Microphones • Cardioid polar pattern • Defferoid noise cancelling technologie • Outstanding gain-before-feedback and isolation • CM-311A has battery/phantom belt back • CM-311AE connects to most wireless transmitters CM-311A CM-311AE Designed for touring and live-sound applications, the CM-311A is a rugged head-worn microphone with unequalled performance. It sounds like the best handheld microphones-full, clear, and distortion-free, even with the loudest singers. The CM-311A is the latest version of the Crown’s® proprietary Differoid technology. “Differoid” stands for differential cardioid. A differential microphone is a noise-cancelling mic, which cancels sounds beyond a few inches away such as floor monitors, instruments on stage, and crowd noise. And a cardioid microphone rejects sounds behind the microphone -such as floor monitor speakers. Controlled field tests showed that the Differoid provides up to 12 dB more gain before feedback than conventional cardioid microphones. Many users of the Differoid say that their house mix is better because the mic’s isolation is nearly complete. The microphone was also designed to reject sound behind the microphone, for example, from a floor monitor speaker. Not only does this prevent feedback, it also reduces the sonic coloration caused by monitor sound leaking into the vocal microphone. This results in the CM-311A having outstanding gain-before-feedback and isolation. Lightweight and comfortable, the mic’s headband and boom adjust to fit any singer. An included pop filter greatly reduces breath noise and pops. Because of the boom’s unique behind-the-ear design, it does not cover up the singer’s face.