The PZM30 D high-performance hemispherical boundary layer microphone is a Pressure Zone Microphone® designed for professional recording, sound reinforcement and broadcasting. The capsule is mounted in the ?pressure zone?, an area where direct sound and reflected sound are in phase, which provides a 6dB higher sensitivity. Two selectable frequency responses (flat/rising) provide greater flexibility in mic placement and sonic character. The rising position of the frequency switch adds brilliance and a crisp attack on percussion, drums, or piano. The PZM30 D comes in a very rugged, low-profile, metal housing with detachable cable that makes it sturdy and reliable for heavy duty applications.