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Crown International, Inc.
1718 W. Mishawaka Rd.
Elkhart, IN 46517-9439
TEL: 574-294-8000
FAX: 574-294-8FAX
www.crownaudio.com
©2005 Crown Audio
®
, Inc. Specifi cations subject to change
without prior notice. Latest information available at
www.crownaudio.com. Crown, Crown Audio, PZM and Pres-
sure Zone Microphone are registered trademarks of Crown
International. Pressure Recording Process is a trademark of
E. M. Long Associates.
9/05 102362-5
PZM-20R
PZM-20RW
Fig. 2B
For small conference tables seating up to
eight people, mount the 20R in the center of
the table. For larger tables, use one 20R in
the middle of every four to six people. Ideally
no person should be more than 3 feet from
the nearest microphone. For maximum clarity
hold the conference in an acoustically “dead”
room with carpeting, acoustic-tile ceiling and
drapes.
Operating Instructions
Using two-conductor shielded microphone
cable, connect the output of the 20R to a
mixer microphone input that provides 12-48
volts phantom powering. This cable may be
of any length because the microphone output
is balanced low impedance.
The 20R has three screw terminals. Connect
screw #1 to the cable shield, #2 to the audio
in-polarity (hot) lead, and #3 to the audio
cold lead. On the equipment end of the cable,
solder the cable to the XLR-type connector as
follows: pin 1: shield, pin 2: audio in-polarity
(hot) lead, pin 3: audio cold lead.
If your mixer or recorder does not provide
phantom powering, you’ll need a microphone
power supply. Crown offers a model PH-4B
power supply for powering up to four PZMs.
Also available is a single channel AC/bat-
tery supply, Crown model PH-1A. Connect
the 20R output to the power-supply input;
connect the power-supply output to your
recorder or mixer mix input.
Architects’ and Engineers’ Specifi cations
The microphone shall be the Crown Model
PZM-20R or equivalent. The microphone
shall be a Pressure Zone, electret condenser
type, designed for permanent fl ush-mount-
ing in a 4.59-in. (11.659-cm) square hole or
in a standard 4.0-in. x 4.0-in. (10.16-cm x
10.16-cm) electrical outlet box. A smooth
frequency response from 80 Hz to 20,000 Hz
shall be obtained. The microphone shall have
a sensitivity of –43 dBV/Pa (measured on
an infi nite boundary). The microphone shall
accept a 150 dB SPL input while producing
no more than 3% THD (open-circuit termina-
tion). Equivalent noise shall be typically 20
dBA (0 dB = .0002 dyne/cm
2
). The Crown
model PZM-20R is specifi ed.
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 sheet for
more detail.
Service
If the microphone does not function properly,
replace or repair mic cables and connectors,
check the power supply. If it is determined
that the microphone needs service and you
want to return it to Crown, a Service Return
Authorization (SRA) is required. An SRA can
be completed online at www.crownaudio.
com/support/factserv.htm. After securing an
SRA, return the microphone in its original
packaging to: Crown Factory Service, 1718
West Mishawaka Road, Elkhart, Indiana
46517-9439. For further assistance or techni-
cal support call 800-342-6939.
+
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A
(4) PILOT HOLES FOR ROUTER
0.25 in. (0.635 cm) RADIUS
(USE 0.5 in. (1.27 cm) ROUTER BIT)
A
4.094 in.
10.399 cm
4.59 in. (11.659 cm) SQUARE
0.188 in. (0.476 cm) ROUTER DEPTH
2.75 in. (6.985 cm)
SQUARE
TABLE
TOP
4.094 in.
10.399 cm