"PZM" is addressing a boundary mic using the Pressure Zone Microphone concept and while Crown has a trademark on both "Pressure Zone Microphone" and "PZM", the patent on the concept expired in 1999, so there are other mics using the same concept, however they can't use the trademarked terminology. The actual concept involved is a mic element facing and parallel to a large 'boundary' surface. By getting the element close enough to the boundary surface, in the pressure zone, any reflections off the surface have a relative phase to the direct sound that results in summation up to higher frequencies, the small distance between the element and reflecting surface pushes the frequency where combfiltering occurs up high enough to not be a factor. This means more gain from the summation and less problems with combfiltering than traditional microphones on a stand.
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