Crown Audio specifications PZM -11LLWR, Special order, as a PZM-11LLWRS1, Installation

POLAR

PATTERN

PRESSURE

ZONE

MICROPHONE

®

PZM -11LLWR

he Crown® PZM®-11LLWR is a weather- Tresistant Pressure Zone Microphone®

with a balanced, line-level output. A plastic membrane inside the microphone protects the mic capsule from water damage. The mic mounts in a standard electrical outlet box. Applications include fast-food restaurants, outdoor intercoms, toll booths, bridges, theme park security, home automation, and so on.

The microphone can be plugged directly into a VCR line input — no costly mic preamp is needed. Output (via screw terminals) can be balanced or unbalanced. Powering is by 12-24V AC or DC. The unit can be factory-set for phantom powering by

special order, as a PZM-11LLWRS1.

In the PZM-11LLWR, frequencies below the voice range are rolled off to reduce traffic rumble. The high-frequency response is boosted to help ar- ticulation. Because of its tailored response and PZM construction, the PZM-11LLWR will pick up conversations or other desired sounds with extra clarity.

The unit is “weather resistant,” which means:

•The microphone will work during and after rainfall.

•The mic’s frequency response will change tempo- rarily if the membrane gets wet, but will return to normal when dry.

•If water freezes on the membrane, the mic’s frequency response will change, but will return to normal when the ice melts and the membrane dries.

•High-pressure water sprays directly on the membrane (through the louvered wall plate) may damage the membrane.

•The microphone is not designed to be sub- merged.

Installation

1.Please refer to Figure 3 and locate all the parts shown. The electrical outlet box and cables are not included.

2.Run a 2-conductor shielded cable to the surface where you intend to install the microphone. In- stall a standard electrical outlet box there (2-inch minimum depth).

3.The PZM-11LLWR can be powered by 12-24V AC or DC.

From your power source, run a twisted pair power cable to the mic location. Run the power cable through the hole in the electrical box. Service the end of the power cable.

Features	• Line-level output connects directly to video
• Ideal for outdoor security, surveillance and
		recorders
intercoms	•	Clear, articulate sound
• Weather-resistant	•	Inconspicuous
Specifications		Fig. 1
Transducer type: Electret condenser.		Frequency Response
Frequency response (typical): 80 Hz to 10,000 Hz
(see Fig. 1).
Polar pattern: Hemispherical.
Impedance: 75 ohms, balanced. Recommended
minimum load impedance 1000 ohms.
Open-circuit sensitivity, typical: 1.4 V/Pa.
Power sensitivity, typical: +8 dBm/Pa.
Equivalent noise level (self-noise): 26 dB SPL typi-
cal (0 dB = .0002 dyne/cm2), A-weighted.
S/N Ratio: 68 dB at 94 dB SPL.		Frequency in Hz
Maximum SPL: 100 dB SPL produces 3% THD at		Fig. 2
maximum gain.

Operating voltage: 12-24V AC or DC. Phantom pow-	Dimensions
ering by special order as a PZM-11LLWRS1.
Polarity: Positive pressure on diaphragm produces
positive voltage on audio+ terminal with respect to
audio– terminal
Current drain: 4 milliamperes.
Operating temperature range: –10° to + 60° C, or
+14° to +140° F. The mic still works at –40° C but
its sensitivity is reduced. When the mic is returned
to normal operating temperature, its sensitivity will
be within +/–3 dB of normal.
Output connector: Screw terminals labeled AUDIO +,
AUDIO – and GROUND.
Cable: None supplied. Use 2-conductor shielded mic
cable and twisted-pair power cable.
Materials: Steel plate and high-impact plastic capsule
holder. Plastic membrane, part no. 127255-1.
Finish: Silver. If you paint the mic, take care not to
paint inside the louvered wall plate.
Net weight: 2.5 oz. (71 g).
Dimensions: 4.530 x 2.780 x 1.722 inches (LWD)
(see Fig. 2).

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