Description
The Model 545SD-LC is a dual-impedance, unidirectional, dynamic microphone. Features low-impedance operation, it features a silent magnetic reed on/off switch.
The Classic Unidyne 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.
Features
- Exceptionally uniform cardioid pattern minimizes feedback
- Selectable dual-impedance operation
- Silent magnetic reed on/off switch with lock option
- Cardioid Dynamic Microphone
- Frequency response: 50 to 15,000 Hz
Specifications
Frequency Response 50 to 15,000 Hz
Polar Pattern Cardioid (unidirectional)-uniform with frequency, symmetrical about axis
lmpedance 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.
Output Level (at 1,000 Hz)
Open Circuit Voltage*
- L-58.0 dB (1.3 mV)
- H -35.0 dB(17.6 mV)
Polarity Positive pressure on diaphragm produces positive voltage on pin 2 (with respect to pin 3).
Switch Built-in magnetic reed on/off switch with lockplate. To lock switch in the ON position, remove screw on lockplate and turn lockplate 180°. Reassemble and tighten screw.
Cartridge Shock Mount Internal rubber vibration-isolator
Swivel Adapter Positive action, adjustable through 90° from vertical to horizontal, permits easy removal for handheld use, suitable for mounting on stand with 5/8”–27 thread
Case Chrome-plated die casting with ARMO-DUR® grille and stainless steel screen
Net Weight (less cable) 255 grams (9 oz)
*0 dB = 1 volt per Pascal (1 Pa = 94 dB SPL)
