Sennheiser MD 421-II Cardioid Dynamic MicrophoneThe 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