Product Detail Pick-up Pattern: Cardioid Frequency Response: 30 - 17,000 Hz Sensitivity (free field, no load) (1 kHz): 2 mV/Pa +/- 3 dB Nominal Impedance: 200 ohms Minimum Terminating Impedance: 200 ohms . The "Sennheiser MD421II Dynamic Microphone" is best product for you. We recommended Sennheiser MD421II Dynamic Microphone