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POLAR
PATTERN
PRESSURE
ZONE
MICROPHONE
T
he Crown
®
PZM
®
-11LLWR is a weather-
resistant 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 traffi c 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.
PZM
®
-11LLWR
Specifi cations
Transducer type: Electret condenser.
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/cm
2
), A-weighted.
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
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/cm
2
= 10 microbars = 94 dB SPL.
Fig. 1
Frequency in Hz
Frequency Response
Fig. 2
• Ideal for outdoor security, surveillance and
intercoms
• Weather-resistant
• Line-level output connects directly to video
recorders
• Clear, articulate sound
• Inconspicuous
Features
Dimensions