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.

Dynamic Capsule The
MD 421-II features a dynamic capsule, resulting in even signal response
in close and reasonable distances as well as the capacity to handle
high SPL levels. Cardioid Polar Pattern The
cardioid polar pattern is effective in attenuating off-axis noise and
ambiance. The cardioid polar pattern is also effective in rejecting
feedback due to monitors. 5-Position Bass Roll-Off The
5-position low frequency roll-off switch offers flexible bass
attenuation allowing the microphone to be used in a variety of
situations.