Fig. 3; Architects’ and Engineers’ Specifications; Crown Service Department, Plant 2SW, 1718- Page 2

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