PRESSURE ZONE

MICROPHONE®

®

PZM-11

The Crown PZM®-11 is a Pressure Zone Microphone® designed for security, sur- veillance, and conference-room applica-

tions. It 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 something other than a micro- phone so as not to draw attention.

Like other Pressure Zone Microphones, the PZM-11 utilizes the Pressure Recording Pro- cessin which a miniature condenser microphone capsule is mounted very close to

asound-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 com- bines 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. Powering is via 12 to 48 volts phantom power.

Installation

1.Please refer to Fig. 3 and locate all the parts shown.

2.Run a 2-conductor shielded microphone cable to the ceiling or wall hole where you intend to install the microphone. Install a standard electrical outlet box in the hole.

3.Run the mic cable through the hole in the electrical box and through the hole in the chassis.

4.Service the end of the mic cable.

5.Attach the leads to the screw terminals. Connect the cable shield to 1, light-colored lead to 2, and darker lead to 3.

6.Place the chassis over the two long screws. Using the nuts provided, secure the chassis to the faceplate.

7.Using the two screws provided, secure the faceplate to the electrical box.

Specifications

Type: Pressure Zone Microphone.

Element: Electret condenser.

Frequency response (typical): 80 Hz to 20,000 Hz.

See Fig. 1.

Polar pattern: Hemispherical.

Impedance: 225 ohms, balanced. Recommended minimum load impedance 1000 ohms.

Open circuit sensitivity: 5 mV/Pa* (–46 dBV/Pa).

Power sensitivity: –45.5 dBm/Pa*, EIA rating –139 dBm.

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: 120 dB SPL produces 3% THD.

Output connector: Three screw terminals.

1 = ground, 2 = audio (hot), 3 = audio (return).

Polarity: Positive pressure on the diaphragm produces a positive voltage on screw terminal 2 with respect to screw terminal 3.

Operating voltage: Standard phantom power, 12 to 48 volts DC on screw terminals 2 and 3 with respect to screw terminal 1.

Current drain: 400 microamperes.

Materials: Steel plate and high-impact plastic capsule holder.

Finish: Off-white.

Net weight: 2.5 oz. (71 g).

Dimensions: See Fig.2.

Optional accessories: Crown PH-1A phantom power supply (1 channel, battery or AC adapter powered), Crown PH-4B phantom power supply (4 channels, AC powered).

*1 pascal = 10 dynes/cm2 = 10 microbars = 94 dB SPL.

Fig. 1

Frequency Response

+15

+10

+5

dB 0

–5

–10

–15

–20

–25

–30

–35

20

100

1K

10K

Frequency in Hz

Fig. 2

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Crown PZM-11 specifications Installation, Please refer to and locate all the parts shown

PZM-11 specifications

The Crown PZM-11 is an advanced military vehicle that has garnered attention due to its robust design and cutting-edge technologies. This multi-role machine is primarily utilized for reconnaissance and battlefield support, making it a vital asset for modern armed forces.

One of the most striking features of the PZM-11 is its exceptional mobility. Built on a highly durable chassis, it is designed to traverse a variety of terrains, including rugged mountain landscapes and urban environments. Its powerful engine delivers impressive horsepower, allowing it to perform efficiently under challenging conditions. The vehicle's compact design minimizes its footprint, enabling it to navigate tight spaces and steep inclines with ease.

The PZM-11 is equipped with state-of-the-art surveillance and communication systems, providing real-time data to command centers. This capability improves situational awareness and enhances decision-making processes in the heat of battle. The onboard sensors and drones enable the vehicle to gather intelligence on enemy movements and fortifications, contributing to effective strategic planning.

Armor protection is another critical characteristic of the Crown PZM-11. The vehicle features advanced composite materials designed to withstand various combat scenarios. This includes protection against small arms fire, shrapnel, and improvised explosive devices (IEDs). Additionally, the vehicle can be fitted with reactive armor, further enhancing its defensive capabilities.

In terms of weaponry, the PZM-11 is highly versatile. It can be equipped with a range of armaments, from machine guns to anti-tank missiles, allowing it to engage various targets effectively. The modular design enables quick adaptations based on mission requirements, which is crucial for modern warfare.

Another notable aspect of the PZM-11 is its emphasis on crew comfort and ergonomics. The interior incorporates advanced controls designed for ease of use, allowing personnel to operate the vehicle efficiently, even under stressful conditions. Enhanced visibility systems, including panoramic windows and night vision capabilities, contribute to the crew's effectiveness during nighttime operations.

In summary, the Crown PZM-11 represents a significant advancement in military vehicle technology. Its blend of mobility, surveillance capabilities, armor protection, and modular armament options makes it a formidable choice for modern armed forces. As military needs evolve, the PZM-11’s design accommodates these changes, ensuring that it remains a relevant and effective platform in various operational theatres.