Crown PZM-11LL
PZM Mic Mounted on Standard Wall Plate, Line-Level, PZM11LL

The Crown PZM-11LL 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-11LL is designed to look like a light switch so as not to draw attention.

The PZM-11LL has a line-level output and can be powered by 24V AC, 12-24V DC, or 12-48V phantom power. Since the PZM-11LL has a high output, it can be plugged directly into a VCR line input - no costly mic preamp is needed. (To phantom power the PZM-11LL, a modification will have to be made to the electronics module.)

Like other Pressure Zone Microphones, the PZM-11LL 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 consistant pickup anywhere around the microphone.

In the PZM-11LL, 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.

PZM-11LL Features

• Ideal for security, surveillance and conference rooms
• Clear, articulate sound
• Low-impedance screw-terminal output
• Inconspicuous
• Line-level

Specifications

• Type: Pressure Zone Microphone
• Element: Electret Condenser
• Frequency Response: 80 Hz to 20,000 Hz
• Polar Pattern: Hemispherical
• Impedance: 75 ohms, balanced; Recommended load impedance: 100 ohms
• Open Circuit Sensitivity: 1.4V/Pa
• Power Sensitivity: +8 dBm/Pa
• Equivalent Noise Level (self-noise): 26 dB SPL typical, A-weighted
• S/N Ratio: 68 dB at 94 dB SPL
• Maximum SPL: 100 dB SPL produces 3% THD
• Output connecter: Three screw terminals, 1=ground, 2=audio hot (in polarity), 3=audio cold (opposite polarity)
• Operating Voltage: 24V AC, 12-14V DC
• Current Drain: 4 mA
• Finish: Off-white, may be painted any color; take care to first seal the opening between the mic capsule and boundary plate
• Net Weight: 2.5 oz