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Crown PZM11LL Pressure Zone Professional Microphone For Security And Surveilence  | | Crown PZM11LL Pressure Zone Professional Microphone For Security And Surveilence
PZM Series 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. PZMs prevent phase interference from surface reflections, allowing a wide, smooth response. Microphone sensitivity is boosted 6 dB by the surface mounting.
Crown PZM Series microphones offer serious tools for the sound reinforcement and recording professional, as well as cost-effective solutions for a variety of other needs. As the first licensed manufacturer of the Pressure Recording Process (the foundation of PZM technology), Crown has developed the most successful line of PZM microphones available today.
Crown PZM Series microphones let the user optimally place microphones in the performance venue. Designed for use on flat surfaces, PZMs can be placed where conventional microphones do not work well. 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.
These technical innovations, combined with numerous others, give Crown a leading edge in bringing high-quality PZM products to the market.
The Crown® PZM®-11 or 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-11 and PZM-11LL are 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. 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 modifi cation will have to be made to the electronics module (see Installation Step 3 for details). A factory modifi ed version for direct phantom power is available as the PZM-11LLS2. Like other Pressure Zone Microphones, the PZM-11and PZM-11LL utilize the Pressure Recording Process™ in which a miniature condenser microphone capsule is mounted very close to a sound-refl ecting 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 refl ected off the boundary. The benefi ts are a wide, smooth frequency response free of phase interference, excellent clarity and “reach,” and consistent pickup anywhere around the microphone. In the PZM-11and 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.
Specifications
Type: Pressure Zone Microphone.
Element: Electret condenser.
Frequency response (typical): 80 Hz to 20,000 Hz.
Polar pattern: Hemispherical.
Impedance:
PZM-11: 225 ohms, balanced.
PZM-11LL: 75 ohms, balanced. Recommended minimum load impedance 1000 ohms.
Open circuit sensitivity:
PZM-11: 5 mV/Pa* (–46 dBV/Pa).
PZM-11LL: 1.4V/Pa* (+3 dB re 1V/Pa).
Power sensitivity:
PZM-11: –45.5 dBm/Pa*
PZM-11LL: +8 dBm/Pa*.
Equivalent noise level (self-noise): 26 dB SPL typical (0 dB = .0002 dyne/cm2), A-weighted.
S/N Ratio: 68 dB at 94 dB SPL.
Maximum SPL: PZM-11: 120 dB SPL produces 3% THD.
PZM-11LL: 100 dB SPL produces 3% THD. Output connector: Three screw terminals. 1 = ground, 2 = audio hot (in polarity), 3 = audio cold (opposite polarity).
Polarity: Positive pressure on the diaphragm produces a positive voltage on screw terminal 2 with respect to screw terminal 3.
Operating voltage: PZM-11: Standard phantom power, 12 to 48V DC on screw terminals 2 and 3 with respect to screw terminal 1.
PZM-11LL: 24V AC, 12-14V DC, or phantom power as the PZM-11LLS2.
Current drain:
PZM-11: 400 microamperes.
PZM-11LL: 4 milliamperes.
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).
Optional accessories: Crown PH-1A phantom power supply (1 channel, AC-adapter powered).
*1 pascal = 10 dynes/cm2 = 10 microbars = 94 dB SPL.
Features
Ideal for security, surveillance and conferrence rooms
Clear, articulate sound
Low-impedance screw-terminal output
Inconspicuous
PZM-11 is mic level; PZM-11LL is line level |
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Crown PZM11LL Pressure Zone Professional Microphone For Security And Surveilence |
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