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®
PZM-10
®
PRESSURE ZONE
MICROPHONE
he Crown PZM®-10 is a Pressure Zone
Microphone
T
surveillance, and conference-table use.
Since it does not look like a microphone, it is
inconspicuous. The mic’s tubular housing
mounts in a 25/32" diameter hole in a ceiling
panel, wall or table.
Like other Pressure Zone Microphones, the
PZM-10 uses a miniature mic capsule
mounted very near a sound-reflecting 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.
In the PZM-10, low frequencies below the
voice range are rolled off to reduce pickup of
air conditioning rumble. The high-frequency
response is boosted slightly to help articulation. Because of its tailored response and PZM
construction, the PZM-10 will pick up conversations or other desired sounds with extra
clarity and definition.
The microphone connector is an XLR type
(3-pin pro audio) for easy plug-in installation.
The output is balanced, low impedance, which
allows long cable runs without hum pickup or
high-frequency loss. Powering is by 12 to
48 V phantom power.
The mic’s humbucking transformer and steel
case prevent hum pickup, even near fluorescent lights.
Installation
To pick up speech at a small conference table
(about 6 feet square), mount one PZM-10 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 microphone.
1. Please refer to Fig. 2 and identify the parts
shown.
2. Determine where you want to install the
microphone, and drill a 25/32" diameter hole
there.
®
designed for security,
Specifications
Transducer type: Electret condenser.
Frequency response (typical): 80 Hz to 20,000
Hz. See Fig. 1.
Polar pattern: Hemispherical.
Impedance: 240 ohms, balanced. Recom-
mended minimum load impedance 1000
ohms.
Open circuit sensitivity: 2.5 mV/Pa*
(–52 dBV/Pa).
Power sensitivity: –52 dBm/Pa*
Equivalent noise level (self-noise): 26 dB SPL
typical (0 dB = .0002 dyne/cm
S/N Ratio: 68 dB at 94 dB SPL.
Maximum SPL: 120 dB SPL produces 3% THD.
Operating voltage: 12 to 48 V phantom power,
positive voltage on pins 2 and 3 with respect
to pin 1.
Polarity: Positive pressure on the diaphragm
produces a positive voltage on pin 2 with
respect to pin 3 of output connector.
Current drain: 400 microamperes.
Output connectors: Male XLR type (3-pin pro
audio).
Cable: None supplied. Use 2-conductor shielded
mic cable.
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: 2.6 oz. (73.6 g).
Dimensions: See Fig.2.
*1 pascal = 10 dynes/cm2 = 10 microbars = 94 dB SPL.
2
), A-weighted.
Fig. 1
Fig. 2
Frequency Response
Frequency in Hz
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®
PZM-10
3. 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 rightangle 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.
4. Run the female XLR and mic cable to the
hole.
5. Using a 5/32" Allen wrench, remove the
collar from the microphone. Insert the microphone tube into the hole.
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. Plug your mic cable into the microphone.
8. 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-4B or PH-1A.
Connect the output of the supply to the mic
input of your mic preamp, mixer or recorder.
Architects’ and Engineers’ Specifications
The microphone shall be the Crown PZM-10
or equivalent. The microphone shall be a
electret condenser Pressure Zone Microphone
with a hemispherical polar pattern. The microphone shall have a tubular housing which
mounts in a 25/32" 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 microphone is specified.
Warranty
Crown 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, first replace or repair
the mic cables and check the power supply. If
service is required, return the microphone in
its original packaging to Crown’s Service
Department at Plant 2 SW , 1718 Mishawaka
Road, Elkhart, Indiana 46517. For further
assistance or technical support call 800-342-
6939.
PZM-10 Schematic
Crown International, Inc.
P.O. Box 1000
Elkhart, IN 4651 5-1000
TEL: 219/294-8000
©
Specifications subject to change without prior notice.
PZM® and Pressure Zone Microphone® are regis-
tered trademarks of Crown International, Inc.
Pressure Recording Process™ is a trademark of
E.M. Long Associates.
4/98 126259-1
FAX: 21 9/294-8FAX
1998 Crown International, Inc.