The UNlDYNE® III Model 545SD is a dual-impedance, unidirectional, dynamic microphone. Shipped connected for low-impedance operation, it features a silent magnetic reed on/off switch.
The UNlDYNE III is a favorite for instrument pickup and recording, and can be used on lecterns for public address systems such as those used in political conventions and legislatures, convention halls, hotels, public auditoriums, stadiums, schools, and churches.
| Transducer | Dynamic |
| Polar Pattern | Cardioid |
| Frequency Response | 50 Hz - 15 kHz |
| Maximum Input Sound Level | not specified by manufacturer |
| Power Requirements | None Dynamic, Requires No Phantom or Battery Power |
| Output Impedance | 150 Ohms (250 Ohms actual) for Connection to Microphone Inputs Rated at 75 to 300 Ohms |
| Output Connectors | XLR-3M Type |
| Dimensions | 6.2 x 1.25" (157 x 32mm) LxDiameter |
| Weight | 12.5 oz. (354 g) |