PZM (Pressure Zone Microphone) Series are omnidirectional boundary microphones. They can be placed on a large surface such as a table, floor, wall, or lectern. Their wide, smooth frequency response makes them ideal for miking pianos, harps and other orchestral instruments. Their small size and low profile also make them an excellent choice for recording projects, conference rooms and security applications. PZMs prevent phase interference from surface reflections, allowing a wide, smooth response. Microphone sensitivity is boosted 6 dB by the surface mounting. The PZM-6D microphone offers switchable dual-frequency "rising" or "flat" response.