Shure 545SD-LC Classic Unidyne Instrument Microphone

Overview

The Shure 545SD-LC is a dynamic instrument microphone designed to deliver clear and focused sound capture for musicians, presenters, and audio engineers. Built around the classic Unidyne design, it features a cardioid pickup pattern that isolates the intended sound source while minimizing background noise. Its switchable low and high impedance options provide flexibility for different setups, whether running long cables or connecting directly to amplifiers and PA systems.

Key features

• Cardioid pattern that reduces feedback and concentrates on the sound source directly in front of the microphone, ensuring clarity in live and studio environments
• Switchable low or high impedance operation to accommodate various audio equipment and cable lengths without signal degradation
• Magnetic reed on/off switch allows silent muting during performances, with an optional lock to prevent accidental shutdowns when mounted
• Standard three-pin XLR output for seamless connection to mixers, audio interfaces, and stage boxes
• End-address design that directs the microphone toward instruments or speakers for precise sound capture
• Rugged yet lightweight housing built to withstand the demands of touring and frequent use while remaining comfortable to hold or mount
• Versatile use cases including instrument recording, public speaking, and live sound reinforcement

Key specs

• Microphone type: Dynamic
• Polar pattern: Cardioid
• Impedance: Switchable low or high
• Connector: Standard three-pin XLR
• Switch: Magnetic reed on/off with optional lock
• Design: End-address
• Weight: Lightweight for ease of handling

Connectivity and compatibility

The microphone’s standard XLR output ensures compatibility with a wide range of professional audio equipment, including mixers, audio interfaces, and PA systems. Its dual impedance feature allows it to adapt to both low-impedance setups for long cable runs and high-impedance devices like guitar amplifiers, making it a flexible choice for various stage and studio configurations.

Performance and reliability

Thanks to its cardioid pattern and classic Unidyne architecture, the microphone delivers focused sound capture that minimizes ambient noise and feedback. The magnetic reed switch provides silent muting without introducing clicks or pops, which is essential for live performances and presentations. Its rugged construction ensures durability on the road, while the lightweight design keeps it comfortable for extended use.

Ideal uses and environments

This microphone works well in rehearsal spaces, school auditoriums, broadcast booths, and touring rigs. It is particularly effective for capturing snare drums, guitar cabinets, acoustic instruments, and spoken word. Its reliable performance and durable build make it a strong choice for musicians and audio professionals who need consistent sound quality in both live and studio settings.