Shure 545SD Unidyne Dynamic Instrument Microphone
The 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 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 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 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 Impedance Selection and Connections.
- Output Level:
- 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 in.-27 thread
- Housing: Chrome-plated die casting with ARMO-DUR grille and stainless steel screen
- Net Weight: less cable 255 g (9oz.)
- 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 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 Impedance Selection and Connections.
- Output Level:
- 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 in.-27 thread
- Housing: Chrome-plated die casting with ARMO-DUR grille and stainless steel screen
- Net Weight: less cable 255 g (9oz.)
