The Shure SM57 is a dynamic microphone with a cardioid polar pattern, widely respected for its versatility, durability, and ability to handle very loud sound sources. It has a frequency response of 40–15,000 Hz, an output impedance of about 150 Ω (actual ~310 Ω), and a sensitivity of −56 dBV/Pa (≈1.6 mV at 1 kHz). Built ruggedly — steel body, metal grille, strong construction — it’s made to withstand demanding use on stage, with drum kits, guitar amps, or in live-sound environments.