Carol - Sigma Plus 1 Live Performance Dynamic Microphone. The Sigma plus series microphones are equipped with our innovative shock mount system and advaned slide switch, which provide you an outstanding elimination from unwanted handling noise and switch bumping noise. With respect to the feedback problem, the super-cardioid characteristic offers a remarkable gain before feedback. Thanks to the significant breakthroughs in capsule's development, the frequency response is incredibly smooth and wide, ups to 18KHz. The Sigma plus series microphones put your sound at the cutting edge and eyes pooping.