Crown PZM-11LLWR Datasheet

®
PZM -11LLWR
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.
POLAR
PATTERN
PRESSURE
ZONE
MICROPHONE
®
Features
• Ideal for outdoor security, surveillance and
intercoms
• Weather-resistant
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
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
• Line-level output connects directly to video
• Clear, articulate sound
• Inconspicuous
2
), A-weighted.
2 = 10 microbars = 94 dB SPL.
recorders
Fig. 1
Frequency Response
Frequency in Hz
Fig. 2
Dimensions