Product Overview
Features selectable dual-impedance operation and a silent on/off switch.
The predecessor to the SM57, 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.
Features
- Exceptionally uniform cardioid pattern minimizes feedback in PA applications
- Selectable dual-impedance operation
- Silent magnetic reed on/off switch with lock option
- Cardioid dynamic
- Frequency response: 50 to 15,000 Hz
Specifications
- Type: Dynamic (moving coil)
- Frequency Response: 50 to 15,000 Hz
- Impedance: Dual. Microphone rating impedance is 150 ohms (250 ohms actual) for connection to microphone inputs rated at19 to 300 ohms and 'High' for connection to high impedance microphone inputs. Wired for low impedance as supplied. To change impedance, see sections on Impedance Selection and Connections.
- Output Level, Open Circuit Voltage at 1kHz
- 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 lock plate. To lock switch in the ON position, remove screw on lock plate and turn lock plate 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 in.-27 thread
- Housing: Chrome-plated die casting with ARMO-DUR grille and stainless steel screen
- Net Weight, less cable: 255 g (9oz.)