Sennheiser MD431 Dynamic Microphone Sennheiser's best dynamic mic for live vocals just got better. The supercardioid MD 431 II has a custom-tailored frequency response to achieve added transparency. A nearly frequency-independent, polar pattern offers incredibly high gain before feedback and provides uncolored off-axis response. Its new rugged housing has a steel-mesh grille, a shock-suspended capsule, and a hum-bucking coil. It features a noiseless, magnetic reed on/off switch which is recessed in its handle, and internal electronics for refining proximity effect. Polar Pattern General Specs Pick Up Pattern Supercardioid Frequency Response 40-16,000 Hz Sensitivity 2.2 mV/Pa +/- 2.5 dB Nominal Impedance 250 ohms Min Terminating Impedance 1000 ohms Dimensions 8" x 2" x 1.25" Weight Approx. 9 oz (230 g)