Crown International, Inc.
P. O. Box 1000
Elkhart, IN 46515-1000
TEL: 219-294-8000
FAX: 219-294-8FAX
©
2000 Crown International, Inc.
Crown
®
, PZM
®
and Pressure Zone Microphone
®
are
registered trademarks of Crown International, Inc.
Pressure Recording Process is a trademark of E. M.
Long Assocates.Specifications subject to change
without prior notice.
3/00
125576-3
mixer input, or if your mixer has phantom power
built in, simply plug the PZM direct into a mixer
mic input.
is placed. Specifically, the response begins to
shelve down at and below the frequency F,
where F = 750/D, and D = the boundary dimen-
sion in feet. At approximately F = 188/D, the
output of the microphone is down 6 dB, be-
comes omnidirectional, and maintains a flat
response down to approximately 30 Hz.
Several placement examples are described in
the
Crown Boundary Mic Application Guide
,
available free from your dealer or directly from
the Crown Literature Department.
Architects’ and Engineers’ Specifications
The microphone shall be the Crown PZM-6D
or equivalent. The microphone shall have a
hemispherical pattern when used on an
infinite boundary. The element shall be a sub-
miniature electret type of rugged construc-
tion. A smooth frequency response from 20
Hz to 20 kHz shall be obtained. The response
shall be switch-selectable between flat (F) or
rising (R).
The microphone shall employ the patented
PRP principle for maintaining phase coher-
ency, thus eliminating comb filtering in the
audible spectrum.
Permanently attached to the microphone is a
fifteen-foot black cable with an XLRM con-
nector.
The PZM-6D shall have a sensitivity of –43
dBV/Pa. The microphone shall accept 150 dB
SPL input while contributing no greater than
3% THD (open circuit termination). Equiva-
lent noise shall be typically 20 dBA re .0002
dyne/cm
2
. The Crown PZM-6D is specified.
PZM-6D Schematic
Fig. 3
2
+
3
1
1
2
3
18V (TWO 9-V ALKALINE)
MATCH RESISTORS WITHIN 1% (10 OHMS)
TO MIC
TO MIXER
MIC INPUT
1:1 XFMR
100mF 25V
1K
CT
TO MIXER
MIC INPUT
TO MIC
18V (TWO 9-V ALKALINE)
1K
+
100mF 25V
+
2
1
3
1
2
3
+
If your mixer or recorder requires an unbalanced
phone plug connector, modify the cable exiting
the power supply as follows: solder the cable
shield and the pin-3 lead to the phone-plug
ground terminal. Solder the pin-2 lead to the
phone plug “hot” or “tip” terminal.
Placement
PZMs are designed to operate on any stiff, non-
absorbent boundary (or surface). Typical bound-
aries are a floor, wall, ceiling or table. This type
of mounting maintains the flattest low-frequency
response.
The published response curve is measured on
an “infinite” boundary such as a floor, ceiling or
wall. The microphone’s low-frequency response
depends on the size of the boundary on which it
Warranty
Crown professional microphones are guaran-
teed unconditionally against malfunction from
any cause for a period of three years from date
of original purchase. Please refer to the en-
closed full warranty sheet for more detail.
Service
If the microphone does not function properly,
check that it is placed correctly and is con-
nected as described in the Operating Instruc-
tions. Also check mic cables and your power
supply. If the microphone is defective, return
the microphone in its original packaging to:
Crown Service Department, Plant 2SW, 1718
W. Mishawaka Road, Elkhart, IN 46517. For
further assistance or technical support call 800-
342-6939.
®
PZM
-6D