Crown PZM-11 Pressure Zone Microphone The Crown® PZM®-11 is a Pressure Zone Microphone® designed for conference-room, security and surveillance applications. Each can be mounted in the ceiling or wall in a standard electrical outlet box. Providing excellent intelligibility, the PZM-11 is designed to look like a light switch so as not to draw attention. The PZM-11 has a mic-level output and is powered by 12-48V phantom power. Like other Pressure Zone Microphones, the PZM-11 utilize 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 PZM-11, 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. Features
- Ideal for security, surveillance and conferrence rooms
- Clear, articulate sound
- Low-impedance screw-terminal output
- Inconspicuous
Specifications Type: Pressure Zone Microphone.
Element: Electret condenser.
Frequency response (typical): 80 Hz to 20,000 Hz.
Polar pattern: Hemispherical
Impedance: 225 ohms, balanced. Recommended minimum load impedance 1000 ohms.
Open circuit sensitivity (typical): 5 mV/Pa* (–46 dBV/Pa).
Power sensitivity: –45.5 dBm/Pa*
Equivalent noise level (self-noise):26 dB SPL typical (0 dB = .0002 dyne/cm2), A-weighted.
Self-noise: 20 dB equivalent sound pressure level, A-weighted.
S/N ratio: 68 dB at 94 dB SPL.
Maximum SPL: 120 dB SPL produces 3% THD.
Polarity: Positive pressure on the diaphragm produces positive voltage on pin 2 with respect to pin 3 of the output connector.
Operating voltage: Standard phantom power, 12 to 48V DC on screw terminals 2 and 3 with respect to screw terminal 1.
Current drain: 400 microamperes.
Output Connector: Three screw terminals. 1 = ground, 2 = audio hot (in polarity), 3 = audio cold (opposite polarity).
Switch: Frequency-response select switch for rising or flat response.
Materials: Steel plate and high-impact plastic capsule holder.
Finish: Off-white. May be painted any color; take care to fi rst seal the opening between the mic capsule and boundary plate.
Net weight: 2.5 oz. (71 g).
*Please note: ALL Crown microphones are built to order.
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