The RE20 Industry Standard Variable-D dynamic cardioid microphone is the favorite among broadcasters and sound engineers worldwide. Variable-D design and heavy-duty, internal P-pop filter reduces proximity effect. Internal element shock-mount reduces vibration-induced noise. Bass roll-off switch. Impedance, Audio Frequency Response 80 - 15,000 Hz, Impedance, Low-Z balanced 150 Ω, sensitivity 1,4 mV/Pascal.