Shure 545SD Classic Instrument Mic (SM57 Predecessor)

Vintage Sound with Modern Versatility

The Shure 545SD Classic Unidyne Instrument Microphone, the predecessor to the legendary SM57, is a dual-impedance, unidirectional dynamic microphone renowned for its vintage tone and versatile performance. Ideal for instrument pickup, recording, and public address systems in Australia, the 545SD features a uniform cardioid pattern, a silent magnetic reed on/off switch with lock-on option, and selectable impedance for compatibility with various audio setups. Its airy top end and less pronounced midrange make it a favorite for capturing guitar amps, snares, and vocals with a unique character.

Clear and Natural Audio Capture

The 545SD delivers a tailored frequency response (50 Hz – 15 kHz) with a slightly airier top end and less “honky” midrange compared to the SM57, offering a cleaner, more open sound for instruments and vocals. Its uniform cardioid polar pattern minimizes feedback by rejecting off-axis noise, making it suitable for live stages, studios, and lecterns in public address systems. The selectable dual-impedance operation (low: 150 Ω, high: 50 kΩ) allows flexibility when connecting to modern high-impedance inputs or vintage gear, ensuring optimal tonal performance.

Rugged Design with Practical Features

Built with Shure’s legendary durability, the 545SD features a rugged die-cast casing and a hardened steel mesh grille to withstand rigorous use. The silent magnetic reed on/off switch with a lock-on option prevents accidental muting, ideal for live performances and presentations. The integrated stand adapter ensures secure mounting, and the standard 3-pin XLR connector simplifies connectivity. While it lacks the leather pouch included with other Shure mics, its robust construction and vintage aesthetic make it a prized addition to any mic collection.

Key Performance Features

• Uniform Cardioid Pattern – Minimizes feedback with excellent off-axis noise rejection

• Tailored Frequency Response – 50 Hz – 15 kHz for clear, open sound with airy highs

• Selectable Dual-Impedance – Low (150 Ω) or high (50 kΩ) for versatile connectivity

• Silent On/Off Switch – Magnetic reed with lock-on option for reliable operation

• Rugged Construction – Die-cast casing and steel grille for durability

• Vintage Unidyne Design – Classic tone, ideal for instruments and public address

• Versatile Applications – Perfect for guitar amps, snares, vocals, and lecterns

Why Choose Audio Shop Australia

• 100% genuine Shure products with manufacturer warranty

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