DBX DriveRack RTA-M, Measurement Microphone, For Driverack and other measuring applications, Ball, electret capsule, Frequency range: 20 - 20,000 Hz, Impedance: 250 Ohm, Sensitivity: -63 dB + 3 dB (0 dB = 1V / microbar 1,000 Hz), 9-52 V phantom power required, Incl. microphone mount and case