Crown GLM-100, PZM-10, MB-3, PZM-11, PZM-11LL Application Manual

CROWN MICROPHONE APPLICATION GUIDE:

SECURITY AND SURVEILLANCE

© 2001 Crown Audio, Inc. All rights reserved PZM®
is a registered trademark of Crown International.
Also exported as Amcron®

102100-2
11-01

Crown International
P.O. Box 1000,
Elkhart, Indiana 46515-1000
[phone] Fax [phone]

CROWN MICROPHONE

APPLICATION GUIDE

SECURITY AND SURVEILLANCE

This guide offers tips on using Crown microphones
to safeguard areas such as warehouses, offices, park­ing garages, and building entries. Using these micro­phones, a security officer can detect break-ins or
other undesirable activities. We’ll also describe how
to pick up police i nterviews and ps ychiatric sessions.

First let’s look at Crown’s line of mics for security
applications. All the mics are very small, and are
designed NOT to look like microphones, so they are
nearly invisible. They provide clear pickup of
speech.

In all these microphones, th e low frequencies below
the voice r ange a re f iltered ou t to r educe rumble f rom
trucks, machinery and air conditioning. At high fre­quencies, the response is boosted to help articulation.
Because of their tailo red re spo ns e, the Crow n secu ­rity mics pick up conversations or other de sired
sounds with extra clarity.

Some of the model s are Pressure Zone Microphones
(PZMs) . The y use a min ia tu re m ic cap su le m o unte d
very near a sound-reflecting plate or boundary, in the
Pressure Zone . In this zone, di rect sound from the
sound source combines in phase at all frequ encies
with reflected sound off the boundary. The benefits
are many :

• 6 dB more sensitivity

• 6 dB les s no i s e

• a wide smooth frequency response free of phase
interference

• excellent clarity and “reach”

• hemispherical (half-omni) pickup pattern

• consistent pickup anywhere around the micro­phone.

Other models are Mini Boundary (MB) mics. They
use a miniature, unidirectional mic capsule mounted
very near a boundary. Because they are directional,
MB mics can pick up less room reverb than PZMs
do. The result is an even clearer sound.

Below are notes on each Crown microphone model:

PZM-10

This is a miniature PZM that looks like a light
switch. The m ic ha s built-in elec tronics, which are in
an attached tu be. The tube mou nts in a ceiling, panel,
wall or table. It comes with an XLR-type connector
and requires 12-48V phantom power.

PZM-11

Like the PZM-10, the PZM-11 resembles a light
switch. It mounts in a standard electrical outlet box.
The mic comes with a screw-terminal connector and
requires 12-48V phantom power.