Crown Audio Microphone PZM 11LLWR User Manual

POLAR  
PATTERN  
PRESSURE  
ZONE  
MICROPHONE  
PZM®-11LLWR  
he Crown® PZM®-11LLWR is a weather-  
resistant Pressure Zone Microphone®  
T
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.  
Features  
Line-level output connects directly to video  
recorders  
Ideal for outdoor security, surveillance and  
intercoms  
Clear, articulate sound  
Inconspicuous  
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.  
Weather-resistant  
Fig. 1  
Specifications  
Transducer type: Electret condenser.  
Frequency Response  
Frequency response (typical): 80 Hz to 10,000 Hz  
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.  
(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-  
The unit is “weather resistant,” which means:  
cal (0 dB = .0002 dyne/cm2), A-weighted.  
Frequency in Hz  
S/N Ratio: 68 dB at 94 dB SPL.  
Maximum SPL: 100 dB SPL produces 3% THD at  
maximum gain.  
Operating voltage: 12-24V AC or DC. Phantom pow-  
ering by special order as a PZM-11LLWRS1.  
Polarity: Positive pressure on diaphragm produces  
positive voltage on audio+ terminal with respect to  
audio– terminal  
• The microphone will work during and after  
rainfall.  
Fig. 2  
• The mic’s frequency response will change tempo-  
rarily if the membrane gets wet, but will return to  
normal when dry.  
Dimensions  
• 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.  
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.  
• 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.  
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).  
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).  
*1 pascal = 10 dynes/cm2 = 10 microbars = 94 dB SPL.  
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.  
 

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