@crown
®
Microphone Quick Reference
PZM-11 and PZM-11LL Security Mic
PZM-11
The Crown
®
PZM
®
-11 is a Pressure Zone
Microphone
®
designed for security, sur-
veillance, and conference-room appli-
cations. It can be mounted in the ceiling
or wall in a standard electrical outlet
box. Providing excellent intelligibility, the
PZM-11 is designed to look like a light
switch, not a microphone, so as not to
draw attention.
The mic can be mounted in the ceiling or
wall in a standard electrical outlet box. It
also can be installed without a box be-
cause its electronics are shielded inside
a removable metal housing.
Like other Pressure Zone Microphones,
the PZM-11 utilizes the Pressure Re-
cording Process
™
in which a miniature
condenser microphone capsule is
mounted very close to a sound-reflect-
ing plate or boundary. The capsule is
mounted in the “Pressure Zone” just
above the boundary, a region where
sound coming directly from the sound
source combines in-phase with sound
reflected off the boundary. The benefits
are a wide, smooth frequency response
free of phase interference, excellent clar-
ity and “reach,” and consistent pickup
anywhere around the microphone.
In the PZM-11, low frequencies below
the voice range are rolled off to reduce
pickup of air-conditioning rumble. The
high-frequency response is boosted
slightly to aid clarity and articulation.
The microphone connector is a row of
screw terminals for easy installation.
The output is balanced, low impedance,
which allows long cable runs without
hum pickup or high-frequency loss.
Powering of the PZM-11 is via 12 to 48
volts phantom power.
PZM-11LL
The PZM-11LL looks and sounds like
the PZM-11, but has a line-level output
and is powered by 24 VAC, 12-24 VDC,
or phantom power. Since the PZM-11LL
has a high output, it can be plugged
directly into a VCR line input — no costly
mic preamp is needed.
Operation
Please refer to Figs. 1 to 4 and locate all
the parts shown. The electrical box and
cables are not included.
Run a 2-conductor shielded microphone
cable to the ceiling or wall hole where
you intend to install the microphone.
Install a standard electrical outlet box in
the hole. Run the mic cable through the
hole in the electrical box and through
the hole in the chassis. Service the end
of the mic cable.
Attach your mic-cable leads to the screw
terminals labeled OUTPUT. Connect the
mic-cable shield to 1, audio hot (light
color) lead to 2, and audio return (dark
color) lead to 3.
The PZM-11LL can be powered in three
ways: 24 VAC, 12-24 VDC, or 12-48V
2.778
1.510
4.530
2.680
1.160
.356
ELECTRICAL
BOX
NUTS
CHASSIS
LONG
SCREWS
MIC
CABLE
FACEPLATE
SCREW
Fig. 1 PZM-11/11LL Dimensions
Fig. 2 PZM-11 Exploded View
phantom power. The mic is wired at the
factory to be powered by an external 24
VAC source so that it is compatible with
video surveillance systems where 24
VAC is readily available. Attach the power
leads to the screw terminals labeled 24V
AC INPUT. If you want to use phantom
power: Reposition two 0-ohm resistors
(R14 and R15) on the circuit board. No
separate power connections are
needed, since phantom power is sup-
plied through the mic cable. To use 24
VAC or 12-24 VDC: From your power
source, run a twisted pair of power cable
to the ceiling or wall hole. Connect the
positive lead from the DC source to
either screw terminal of the INPUT termi-
nal block. Connect the negative lead to
the ground terminal of the OUTPUT ter-
minal block.
Run the power cable through the hole in
the electrical box (if any) and through
either hole in the chassis. Service the
end of the power cable.
Place the chassis over the two long
screws. Using the nuts provided, se-
cure the chassis to the faceplate.
Using the two screws provided, secure
the faceplate to the electrical box.
If you plan to use a cable connector,
solder the other end of the mic cable to
a 3-pin professional audio connector
(XLR-type). Solder the cable shield to
pin 1, light-colored lead to pin 2, and
darker lead to pin 3.
ELECTRICAL
BOX
NUTS
CHASSIS
MIC
CABLE
FACEPLATE
SCREW
POWER
CABLE
LONG
SCREWS
Fig. 3 PZM-11LL Exploded View
