Crown PZM-10 User manual

PRESSURE ZONE
MICROPHONES
The Crown®PZM®-10 and PZM-10LL,
part of the Pressure Zone Microphone®
line, are designed for security, surveil-
lance, and conference-table use. Since they
do not look like microphones, they are incon-
spicuous. Each mic’s tubular housing mounts
in a 25/32-inch diameter hole in a ceiling
panel, wall or table.
The PZM-10 has a mic-level output and a
3-pin XLR-type connector for easy plug-in
installation. The mic requires 12 to 48V
phantom power.
The PZM-10LL has a line-level output from
its unterminated cable. It requires 12 to 24V
DC.
Like other Pressure Zone Microphones, the
PZM-10 and PZM-10LL use a miniature mic
capsule mounted very near a sound-reflect-
ing plate or boundary, in the Pressure Zone.
In this zone, direct sound from the sound
source combines in phase at all frequencies
with reflected sound off the boundary. The
benefits are many: 6 dB more sensitivity,
6 dB less noise, a wide smooth frequency
response free of phase interference, excellent
clarity and “reach,” and consistent pickup
anywhere around the mic.
Frequencies below the voice range are rolled
off to reduce pickup of air conditioning rum-
ble. The high-frequency response is boosted
slightly to help articulation. Because of their
tailored response and PZM construction, the
PZM-10 and PZM-10LL will pick up conver-
sations or other desired sounds with extra
clarity and definition.
The output is balanced, low impedance,
which allows long cable runs without hum
pickup or high-frequency loss.
The mic’s humbucking transformer and steel
case prevent hum pickup, even near fluores-
cent lights.
Mic Placement
To pick up speech from a small conference
table (about 6 feet square), mount the PZM-
10 or PZM-10LL in the middle of the table.
For longer tables, use one PZM in the middle
of every 4 to 6 people. No person should be
more than 3 feet from the nearest micro-
phone.
(continued on back)
Specifications
Transducer type: Electret condenser.
Frequency response (typical):
PZM-10: 80 Hz to 20,000 Hz. See Fig. 1. PZM-
10LL: 100 Hz to 20,000 Hz. See Fig. 2.
Polar pattern: Hemispherical.
Impedance:
PZM-10: 240 ohms, balanced.
PZM-10LL: 75 ohms, balanced. Recommended
minimum load impedance 1000 ohms.
Open circuit sensitivity:
PZM-10: 2.5 mV/Pa* (–52 dBV/Pa).
PZM-10LL: 1.4V/Pa* (+3 dBV/Pa).
See Table 1.
Power sensitivity:
PZM-10: –52 dBm/Pa*.
PZM-10LL: +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: 120 dB SPL produces 3% THD.
Operating voltage:
PZM-10: 12 to 48V phantom power, positive
voltage on pins 2 and 3 with respect to pin 1.
PZM-10LL: 12 to 24V DC, positive voltage on
red lead with respect to shield.
Polarity:
PZM-10: Positive pressure on the diaphragm
produces a positive voltage on pin 2 with
respect to pin 3 of output connector.
PZM-10LL: Positive pressure on the diaphragm
produces a positive voltage on white lead with
respect to black lead.
Operating Temperature Range: –10° to +60° C
(+14° to +140° F).
PZM®-10
PZM-10LL
POLAR
PATTERN
Current drain:
PZM-10: 400 microamperes.
PZM-10LL: 2.8 mA at 12V DC, 4.22 mA at 24V
DC. See Table 1.
Output connectors:
PZM-10: Male XLR type (3-pin pro audio). PZM-
10LL: None.
Cable:
PZM-10: None supplied. Use 2-conductor
shielded mic cable.
PZM-10LL: 12-in., permanently attached 3-con-
ductor shielded cable. Red: B+, White: audio+,
Black: audio–, Shield: ground.
Materials: Steel plate and housing.
Finish: Off-white. May be painted any color; take
care to first seal the opening between the
capsule and boundary plate.
Net weight: PZM-10: 2.6 oz. (73.6 g).
PZM-10LL: 3.3 oz. (93.9 g).
Dimensions: See Fig. 3.
*1 pascal = 10 dynes/cm2= 10 microbars = 94 dB SPL.
Features:
• Pressure Zone Microphones for security
and surveillance
• Clear, intelligible pickup of speech
• Choice of mic level output (PZM-10) or
line-level output (PZM-10LL)
• Inconspicous, resembles a light switch
• PZM-10 powered by 12-48V phantom
power
• PZM-10LL powered by 12-24V DC
B+ SENSITIVITY DRAIN
24V 1.4 V/Pa 4.22 mA
20V 1.4 V/Pa 3.00 mA
15V 1.0 V/Pa 2.75 mA
12V 0.9 V/Pa 2.50 mA
Effect of power-supply voltage on
PZM-10LL sensitivity and current drain
Table 1

Crown International, Inc.
1718 W. Mishawaka Rd.
Elkhart, IN 46517-9439
TEL: [phone]
FAX: [phone]FAX
www.crownaudio.com
PZM-10
®
3. PZM-10 only: Obtain some 2-conductor
shielded mic cable, long enough to run from
your equipment input to the microphone. If
space is tight behind the mounting surface,
obtain a right-angle female XLR connector.
Solder the female XLR connector onto the
cable: shield to pin 1, hot lead to pin 2, other
lead to pin 3.
PZM-10LL only: Obtain enough mic cable
to run from your equipment input to the mi-
crophone. You can use either a 2-conductor
shielded mic cable with a separate DC power
lead, or a 3-conductor shielded mic cable
(with one of the leads used for power).
4. Run the female XLR (if used) and mic cable
to the hole.
5. Using a 5/32-in. Allen wrench, remove the
collar from the microphone. Insert the micro-
phone tube into the hole.
Mic Placement (continued)
For other placement suggestions, see the
Crown Microphone Application Guide for Se-
curity and Surveillance at www.crownaudio.
com/mic_htm/mic_pubs.htm.
Mic Installation
1. Please refer to Fig. 3 and identify the parts
shown.
2. Determine where you want to install the
microphone, and drill a 25/32-inch diameter
hole there.
©2008 Crown Audio®, Inc. Specifications subject
to change without prior notice. Latest information
available at www.crownaudio.com. Crown, Crown
Audio, PZM and Pressure Zone Microphone are
registered trademarks of Crown International.
Pressure Recording Process is a trademark of E.M.
Long Associates.
5/08 136932-4
Fig. 1
Frequency in Hz
PZM-10 Frequency Response PZM-10
PZM-10LL
6. Slide the collar onto the mic tube. Pull
the plate tight against the hole and press the
collar tight against the mounting surface.
Tighten the Allen screw in the collar.
7. PZM-10 only: Plug your mic cable into the
microphone.
PZM-10LL only: Solder the PZM-10LL cable
leads to your mic cable as described below:
Red to 12-24V DC
White to Audio + lead
Black to Audio – lead
Shield to cable shield and power supply –.
8. PZM-10 only: Plug the other end of your
mic cable into one of these devices:
* A mic preamp that supplies phantom
power.
* A mixer that supplies phantom power.
* A phantom power supply, such as the
Crown PH-1A.
Connect the output of the supply to the mic
input of your mic preamp, mixer or recorder.
Architects’ and Engineers’ Specifications
PZM-10
The microphone shall be the Crown PZM-10
or equivalent. The microphone shall be a
electret condenser Pressure Zone Micro-
phone with a hemispherical polar pattern.
The microphone shall have a tubular housing
which mounts in a 25/32-in. diameter hole.
Open-circuit sensitivity shall be 2.5 mV/Pa
typical. Equivalent noise level shall be 26
dBA typical. Maximum SPL shall be 120
dB for 3% THD. Powering shall be 12-48 V
phantom power. Output connector shall be
male XLR-type. The Crown PZM-10 micro-
phone is specified.
Architects’ and Engineers’ Specifications
PZM-10LL
The microphone shall be the Crown PZM-
10LL or equivalent. The microphone shall be
a electret condenser Pressure Zone Micro-
phone with a hemispherical polar pattern.
The microphone shall have a tubular housing
which mounts in a 25/32-in. diameter hole.
Open-circuit sensitivity shall be 1.4V/Pa typi-
cal. Equivalent noise level shall be 26 dBA
typical. Maximum SPL shall be 120 dB for
3% THD. Powering shall be 12-24 V DC. The
microphone shall have a 12-in. unterminated
cable. The Crown PZM-10LL microphone is
specified.
Warranty
Crown professional microphones are guaran-
teed against malfunction for a period of three
years from date of original purchase. Please
refer to the enclosed full warranty statement
for more detail.
Fig. 2
PZM-10LL Frequency Response
Frequency in Hz
*2.450 in. (6.2 cm) in PZM-10LL
Fig. 3 Dimensions
Service
If the unit fails to work, first replace or repair
the mic cables and check the power sup-
ply. A Service Return Authorization (SRA) is
required for product being sent to the factory
for service. An SRA can be completed on line
at www.crownaudio.com/support/factserv.
htm. If service is required, return the micro-
phone in its original packaging to: Crown
Factory Service, 1718 West Mishawaka
Road, Elkhart, Indiana 46517-9439. For
further assistance or technical support call
800-342-6939.
*