The 545SD-LC classic unidyne instrument microphone is a dual-impedance, unidirectional, dynamic microphone. Shipped connected for low-impedance operation, the 545SD-LC features a silent magnetic reed on/off switch with lock-on option. A favorite for instrument pickup and recording, the 545SD-LC can also be used on lecterns in public address systems.
Silent magnetic reed on/off switch with lock option
Frequency response: 50 to 15,000 Hz
Dual. 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. Wired for low impedance as supplied. To change impedance, see sections on lmpedance Selection and Connections in User Guide.
Built-in magnetic reed on/off switch with lockplate
Positive pressure on diaphragm produces positive voltage on pin 2 (with respect to pin 3)