Shure SM81 (1978–)
A small-diaphragm electret condenser microphone introduced in 1978, known for accuracy and versatility in recording and live sound.
Overview
The Shure SM81 is a small-diaphragm, cardioid electret condenser microphone first introduced in 1978. It quickly became a staple in professional audio environments due to its consistent performance and rugged, roadworthy construction. Designed for high-fidelity sound capture, it’s widely used for acoustic instruments like guitar and piano, drum overheads, vocals, and broadcast applications. Users describe it as a "great all-around mic" and an "industry standard" for over four decades, with enduring respect in pro audio circles.
Specifications
| Type | Condenser (electret bias) |
| Polar Pattern | Cardioid, uniform with frequency |
| Frequency Response | 20 to 20,000 Hz |
| Low-Frequency Response | Selectable: flat, 6 dB/octave rolloff, or 18 dB/octave rolloff |
| Weight | 230 grams (8 oz) |
| Length | 8.33 inches |
| Diameter | 0.927 inches |
| Power | Requires phantom power via PS1 or PS1E2 power supply |
Design
The SM81 features a rugged, roadworthy design built to withstand touring and studio use. Its electret condenser element delivers low distortion across a wide range of load impedances, contributing to its reputation for sonic accuracy and reliability.
Context
Introduced in 1978 as a successor to the SM82, the SM81 became an industry-standard small-diaphragm condenser microphone. It has remained in continuous production and is universally admired in professional audio, praised for its versatility and clarity across recording, live sound, and broadcast applications.
Market
As of 2024–2025, new SM81 units sell for around $395 to $439, with pairs listed at approximately $790. Used "Made in USA" versions are collectible, and some users have noted perceived output level differences between vintage and current-production models.
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