Shure 545SD Dynamic Cardioid Microphone with On-Off Switch, Dual Impedance

The predecessor to the SM57, The 545SD Classic Unidyne Instrument Microphone is a dual-impedance, unidirectional, dynamic microphone. The 545SD features a silent magnetic reed on/off switch with lock-on option. A favorite for instrument pickup and recording, the 545SD can also be used on lecterns in public address systems. Exceptionally uniform cardioid pattern minimizes feedback. Dynamic Frequency Response: 50 to 15,000 Hz. Microphone rating impedance is 150 ohms (250 ohms actual) for connection to microphone inputs rated at 19 to 300 ohms and "High" for connection to high-impedance microphone inputs.