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Boundary Layer Mics

A PZM (a trademark of Crown Audio) is a Pressure Zone Microphone, also known as a boundary layer mic. In most cases a PZM has a small omnidirectional capsule that's a few thousandths of an inch from a flat plate that becomes part of the boundary layer when it's connected to a surface like a floor, wall, or instrument soundboard. PZMs can be useful in recording a piano, since the mic can be attached to the soundboard or underside of the piano lid. Then the lid can be completely closed to eliminate bleed from other instruments. PZMs can be attached to ceilings, floors, or walls to pick up an entire musical ensemble or to capture sounds from sporting events. Another type of boundary layer mic, called a "stage mouse" or "mic mouse", was developed by ElectroVoice, and is often used in theatrical productions. This arrangement employs a cardioid pattern mic that sits in a shock-absorbing cradle that holds the mic's capsule very close to the surface of the floor. As the actors sing or speak, the sound wave travels across the boundary layer on the floor, and is picked up by the stage mouse.