Shure SM137 Small-Diaphragm Cardioid Condenser Microphone

Overview

The Shure SM137-LC is a small-diaphragm cardioid condenser microphone designed to capture detailed and natural sound while minimizing unwanted ambient noise. It covers a wide frequency range from 20 Hz to 20 kHz, making it suitable for recording delicate acoustic instruments as well as handling high-volume sources without distortion. Its balanced XLR output and standard 48 V phantom power make it easy to integrate into professional audio setups for studio, stage, or broadcast use.

Key features

• Small-diaphragm condenser design that captures sound with natural detail and clarity across a broad frequency range
• Cardioid pickup pattern focuses on the sound source while reducing stage bleed and room reflections
• -15 dB pad allows handling of loud sound sources up to 139 dB SPL without distortion
• Transformerless Class-A circuitry and electret element deliver a clean, transparent signal with minimal coloration
• Low self-noise of 19 dB A-weighted ensures quiet passages remain free from hiss and background noise
• Durable construction suitable for both studio recording and live sound reinforcement
• Standard balanced XLR output compatible with professional audio equipment and phantom power supplies

Key specs

• Frequency response: 20 Hz to 20 kHz
• Maximum sound-pressure level: 139 dB SPL (with -15 dB pad engaged)
• Dynamic range: 125 dB
• Self-noise: 19 dB A-weighted
• Polar pattern: Cardioid
• Power requirement: 48 V phantom power
• Output connector: Balanced XLR

Connectivity and compatibility

The microphone connects via a balanced XLR output, which is the industry standard for professional audio gear. It requires 48 V phantom power, which is commonly supplied by mixing consoles, audio interfaces, or dedicated phantom power supplies. This ensures compatibility with a wide range of studio and live sound equipment, making it easy to integrate into existing setups without additional adapters or converters.

Performance and reliability

With its transformerless Class-A circuitry and electret element, the SM137-LC maintains a clean and open sound that fits well in complex mixes. The microphone’s ability to handle high sound-pressure levels without distortion makes it versatile for capturing everything from subtle acoustic performances to loud drums or brass instruments. Its low self-noise and focused cardioid pattern contribute to clear recordings even in challenging acoustic environments.

Ideal uses and environments

This microphone is well suited to musicians, engineers, and content creators who need a reliable and flexible condenser mic for both studio and stage. It works well for acoustic guitars, pianos, string ensembles, and percussion, as well as for broadcast and voice-over applications where clarity and low noise are essential. Its robust design and sound quality make it a strong choice for project studios, live sound reinforcement, and professional recording environments.