AKG C562CM Ceiling Mount Condenser Boundary MicrophoneThis product offers the inherent features of a boundary layer microphone: 6 dB higher sensitivity and elimination of comb filter effects when mounted in a large reflecting surface. Its response is uniform to 20kHz, and the polar pattern is omnidirectional. A weighted signal to noise ratio is a remarkable 78 dB. The microphone's small size makes it ideal for flush mount installation in any plane surface in a performing environment, including ceilings,