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he PZM11 LL WR is a weatherresistant Pressu re 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
ACor DC. The unit can be factory-set for phantom powering by special order.
In the PZM11 LL WR , frequencies below the voice
range are rolled off to reduce traffic rumble. The
high-frequency response is boosted to help
articulation. Because of its tailored response and
PZM construction, the PZM11 LL WR 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
temporarily 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 submerged.
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. Install a standard electrical outlet box
there (2-inch minimum depth).
3. The PZM11 LL WR can be powered by 12-24V
ACor 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.
PRESSURE
ZONE
MICROPHONE
®
Specifications
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 typical
(0 dB = .0002 dyne/cm2), A-weighted.
S/N Ratio: 68 dB at 94 dB SPL.
Maximum SPL: 100 dB SPL produces 3% THD at
maximu m gain.
Operating voltage: 12-24V ACor DC, Phantom
powering by special order.
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 deg. C, 14
to 140 deg. F. The mic still works at –40 deg. Cbut
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).
®
Fig. 1
Frequency Response
Frequency in Hz
Fig. 2
* 1 pascal = 10 dynes/cm2 = 10 microbars = 94 dB SPL.
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AKG ACOUSTICS GMBH
LAXENBURGERSTRASSE 254
1230 VIENNA
AUSTRIA
AKG ACOUSTICS, U.S. SERVICE
24950 GROVE VIEW ROAD
MORENO VALLEY, CA 92551
U.S.A
© 2015 HARMAN International Industries,
Incorporated. All rights reserved. AKG is a
trademark of AKG Acoustics GmbH, registered in
the United States and/or other countries.
Features, specifications and appearance are
subject to change without notice.
www.akg.com
4. Run the mic cable through the hole in the
electrical box. Service the end of the mic cable.
5. Connect the mic cable’s audio hot lead to the
terminal labeled AUDIO+. Connect the audio cold
lead to the terminal labeled AUDIO–. Connect the
cable shield to the terminal labeled GROUND.
6. Attach the power leads to the screw terminals
marked “ ~”. You can use 12-24 V ACor DC.
Polarity does not matter in either case.
7. Using the two shorter screws provided, attach
the mic to the electrical box. Then use the other
two screws to secure the louvered wall plate to
the microphone. Do not remove or damage the
plastic membrane.
8. If the mic cable is run in metal conduit, ground
loops can occur that can cause hum. If hum is
Fig. 3
present after installation, return the unit to
A K G / C r o w n ’s service dept. for ground-lift
modifica tion.
Architects’ and Engineers’ Specifications
The microphone shall be the A K G / C r o w n model
PZM11 LL WR or equivalent. It shall be a Pressure Zone Microphone, mountable in a wall or
ceiling, and designed not to look like a
microphone. It shall have a line-level output
(1.4 V/Pa unloaded) and be powered by
12-24 V ACor DC, or phantom power. The
frequency response shall be from 80 Hz to
10,000 Hz with a low-frequency rolloff to reduce
rumble and high-frequency boost for articulation.
The audio connector and power connector shall
be screw terminals. Output shall be balanced,
low impedance. The electret condenser
transducer shall have a hemi- spherical polar
pattern when the microphone is mounted in a
wall or ceiling. The A K G / C r o w n PZM11 LL WR
microphone is specified.
Warranty
A K G / C r o w n professional microphones are
guaranteed unconditionally against malfunction
from any cause for a period of three years from
date of original purchase. Please refer to the
enclosed full warranty statement for more detail.
Service
If the unit fails to work, recheck all your connec-
tions as described in the Installation Section.
Check the cables and gain resistor. Also check
the power supply to verify that it is supplying
correct voltage. If you determine that the
microphone product is defective, return the
complete product in its original packaging to
one of the addresses below . For further
assistance or technical support call the
international helpdesk at
+43 676 83200 888.