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Sennheiser MD 421 Large Diaphragm Dynamic Microphone

The Sennheiser MD 421 is a large diaphragm dynamic microphone designed for professional recording and broadcast use, recognised for its versatility across a wide range of sound sources.

Sennheiser MD 421 Large Diaphragm Dynamic Microphone Details

The current production Sennheiser MD 421 II is a cardioid dynamic microphone employing a large diaphragm pressure gradient transducer capable of handling high sound pressure levels. It is designed to cope with diverse recording conditions and broadcast applications without the need for external power.

The microphone features a five position bass roll off switch that allows low frequency response to be tailored for different sources and placement distances. Its pronounced directivity supports effective feedback rejection and controlled off axis response, contributing to ease of handling in both studio and live environments.

The Sennheiser MD 421 II continues the established design approach of the original Sennheiser MD 421, retaining its mechanical form factor and core acoustic characteristics while remaining suitable for modern recording workflows.

Sennheiser MD 421 Large Diaphragm Dynamic Microphone Heritage

1960 to 2002

designated as Sennheiser MD 421, MD 421 U, MD 421 N

Passive large diaphragm dynamic pressure gradient microphone with cardioid polar pattern. Early versions were supplied with different connector formats and impedance options depending on broadcast and studio requirements. All variants retained the same fundamental capsule and acoustic design with the five position bass control as a defining feature.

The Sennheiser MD 421 was introduced in 1960 and became one of the company’s most widely used microphones in recording studios, broadcast facilities, and live sound environments. Its ability to handle high sound pressure levels and its adjustable low frequency response made it suitable for drums, guitar cabinets, brass, woodwinds, vocals, and broadcast speech. Over several decades of production, the MD 421 established itself as a studio standard, with minor revisions focused on connectivity and impedance rather than acoustic redesign.
2002 to present

designated as Sennheiser MD 421 II

Retains the passive dynamic pressure gradient design and five position bass roll off switch of the original MD 421. Updated to a standard XLR 3 connector and revised internal construction for contemporary manufacturing, while maintaining the established acoustic behaviour and cardioid directivity.

The MD 421 II was introduced as a continuation of the MD 421 lineage, ensuring compatibility with modern studio and broadcast infrastructure while preserving the characteristics that defined the original model. It remains in current production and continues to be used across recording, broadcast, and live sound applications in line with its long standing role as a general purpose professional dynamic microphone.