The Shure SM58, introduced in 1966, has undergone numerous changes and improvements throughout the years, primarily driven by advancements in manufacturing and the need for greater consistency and durability, while retaining its core design and sound.
Here's a breakdown of key changes and improvements:
Component Updates:
Shure historian Michael Pettersen estimates that the SM58 has gone through anywhere from 40-50 changes in components, mainly due to the microphone outliving its suppliers and the need for longevity.
Impedance:
The original SM58 had dual low-impedance ratings (150 ohm and 50 ohm) to cater to broadcast standards, but Shure now uses a single 150-ohm impedance.
Production Processes:
The SM58 has benefited from more precise tooling, new materials, and better production processes, resulting in greater consistency and increased durability.
Rigorous Testing:
Every SM58 undergoes rigorous testing to meet all specifications before leaving the factory, ensuring consistent quality and reliability.
Wireless Systems:
Shure has also developed wireless SM58 systems, allowing artists more freedom and flexibility on stage.
SM58 LC:
The SM58 LC (formerly SM58 LCE) is a version without a switch, emphasizing robust simplicity and is common for pro-level microphones designed for the stage.
Grille Design:
The grille is designed to dent when dropped, absorbing energy like a crumple zone on a car body.
Unidyne III Element:
The SM58 is based on the Unidyne III microphone element developed in the late 1950s by Shure engineer Ernie Seeler.
Military Specifications:
Shure adheres to rigid military specifications, ensuring the toughness and reliability of the SM58.
Adaptability:
The SM58 has been embraced by various musical genres, from rock and pop to hip-hop and beatboxing.