CAD Audio Equitek M179 Large Diaphragm Infinitely Adjustable Polar Pattern Condenser Microphone Equitek large dual diaphragm capsule Infinitely adjustable polar pattern 20Hz to 20KHz frequency response; 36dBV (16 mV) @ 1 Pa sensitivity 200 Ohms impedance; 143dB (pad engaged) max SPL; 11dBA self noise 100Hz, 6dB/Oct Hi-Pass; 20dB Attenuator