The Sennheiser MD 421-II Microphone is a cardioid, dynamic microphone popularized by the recording and broadcast industry. The MD 421-II is favored for its ability to handle a variety of applications due to its flexible bass control. The microphone features a 5-position bass roll-off switch and frequency response of 30 to 17,000 Hz. The cardioid polar pattern effectively rejects off-axis noise due to room acoustics and noise, and also provides effective feedback rejection often caused by monitors positioned within close proximity.

The MD 421-II features a dynamic capsule, allowing even signal response whether close-up or at a reasonable distance. This is particularly useful for broadcast applications, where announcers and DJs can refrain from remaining absolutely stationary. The MD 421-II also handles very high sound pressure levels, making it suitable for miking instruments high in transient (peak) response.

Sennheiser MD421 II Features

• Rugged professional microphone
• Five position bass roll-off switch
• Effective feedback rejection
• Clear sound reproduction
• Easy handling due to pronounced directivity
  
  Transducer TypeDynamic
• Polar PatternCardioid
• Frequency Response30 Hz - 17 kHz
• Output Impedance200 ohms
• Sensitivity2.0 mV/Pa (-54 dBV) ±2.5 dB
• Connector3-Pin XLRM
• Dimensions
• • Height: 215 mm
  • Diameter: 49 mm
  • Net Weight: 385 g