... pickup pattern (cardioid), rotationally symmetric axis of the microphone, frequency equalization Sensitivity (1 kHz, open circuit voltage ... dB SPL Rated impedance connected to the lower impedance microphone input, rated impedance of 150 ohms (300 ohms ... XLR type male connector) Shell dark gray, enamel surface of die casting metal; matte surface, silver, spherical steel mesh cover Wire microphone ...