Overview
Classic Unidyne instrument mic features selectable dual-impedance operation with a silent on/off switch.
Description
The predecessor to the SM57, the 545SD Classic Unidyne® Instrument Microphone is a dual-impedance, unidirectional, dynamic microphone.
Shipped connected for low-impedance operation, the 545SD features a silent magnetic reed on/off switch with lock-on option. A favorite for instrument pickup and recording, the 545SD can also be used on lecterns in public address systems.
Features
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Exceptionally uniform cardioid pattern minimizes feedback
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Selectable dual-impedance operation
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Silent magnetic reed on/off switch with lock option
Specifications
| Type | Dynamic |
| 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. |
| Output Level | LOW @ 1,000 Hz: Open Circuit Voltage* -58.0 dB (1.3 mV); HIGH @ 1,000 Hz: Open Circuit Voltage* -35.0 dB (17.6 mV) *0 dB = 1 volt per Pascal (1 Pa = 94 dB SPL) |
