AKG PZM11 LL Boundary Layer Microphone

The AKG PZM11 LL is a Pressure Zone Microphone designed for conference-room, security and surveillance applications. It can be mounted in the ceiling or wall in a standard electrical outlet box. Providing excellent intelligibility, the PZM11 LL is designed to look like a light switch so as not to draw attention. The PZM11 LL has a mic level output and is powered by 12-48V phantom power. The PZM11 LL has a line-level output and can be powered by 24V AC, 12-24V DC, or 12-48V phantom power. Since the PZM11 LL has a high output, it can be plugged directly into a VCR line input—no costly mic preamp is needed. To phantom power the PZM11LL, a modification will have to be made to the electronics module. Like other Pressure Zone Microphones, the PZM11 LL utilizes the Pressure Recording Process in which a miniature condenser microphone capsule is mounted very close to a sound-reflecting plate or boundary. The capsule is mounted in the “Pressure Zone” just above the boundary, a region where sound coming directly from the sound source combines in-phase with sound reflected off the boundary.

The benefits are a wide, smooth frequency response free of phase interference, excellent clarity and “reach,” and consistent pickup anywhere around the microphone. In the PZM11 LL, low frequencies below the voice range are rolled off to reduce pickup of air-conditioning rumble. The high frequency response is boosted slightly to aid clarity and articulation. The microphone connector is a row of screw terminals for easy installation. The output is balanced, low impedance, which allows long cable runs without hum pickup or high-frequency loss.