Shure 588SB Vintage Dynamic Microphone

The Shure 588SB Unisphere B is a vintage, factory-set low-impedance (Low-Z) unidirectional dynamic microphone originally introduced in the late 1960s as an entry-level vocal and public address microphone. It is widely recognized for its chrome/silver finish, built-in on/off switch, and its distinctively warm, smooth vintage tone.

Key Technical Specifications:

• Type: Dynamic (does not require phantom power).
• Polar Pattern: Cardioid / Unidirectional (provides excellent feedback rejection).
• Impedance: Low Impedance (Low-Z), designed for connection to 25 to 200-ohm inputs.
• Features: Built-in spherical wind and pop filter, internal shock mount, and a locking on/off switch.
• Connectivity: Early versions used proprietary screw-on cables, while later variants featured standard 3-pin XLR connections.

Understanding the Model Nomenclature Shure marketed this microphone alongside a sister model, and the letters in the name indicate specific configurations:

• 588SB: The "B" denotes the factory-configured Low-Impedance model, meant for plugging into mixers or long cable runs without losing high-frequency response.
• 588SA: The "A" version denotes the High-Impedance (Hi-Z) model, which was highly popular for plugging directly into guitar amplifiers.

Applications and Performance:

• Vocal Clarity: The tailored frequency response makes it great for speech, public announcements, and classic live music performance.
• Feedback & Pop Protection: The cardioid pattern rejects off-axis sound, while the wire-mesh grille isolates breath pops and wind noise.
• Collector Status: Because production moved over the decades (transitioning from the USA to Mexico), it is considered a classic piece of "garage band" music history from the 1960s–1980s.

Unique Details & Vintage Context:

• The High School Combo Legacy: In the 1960s and 70s, Shure specifically marketed the Unisphere B line to the booming "high school combo" and garage rock market. It gave musicians the trusted Shure reliability at a fraction of the cost of a studio-grade SM58.
• The Switch Lock Feature: The on/off switch on the 588SB features a small metal locking plate. Sound engineers could lock the switch into the "On" position to prevent a nervous public speaker or singer from accidentally turning off their microphone mid-performance.