Crown PZM-6D User Manual
3"
2.5"
.375"
2.5"
®
PZM -6D
he PZM-6D is a Pressure Zone Microphone
designed for professional recording, sound
T
reinforcement, teleconferencing and broadcasting. Its low profile, unobtrusive appearance
is appreciated in conference rooms, as well as
on television, film and video productions. When
suspended over an orchestra on a clear panel,
the PZM practically disappears. Its miniature,
permanently attached cable also reduces visual
clutter .
The PZM-6D has a switchable dual frequency
response: rising or flat. The “rising” position
adds brilliance. This makes it useful wherever a
crisp attack is desired, such as on percussion,
drums or piano. The user can get a bright sound
without boosting high frequencies on the recording console; the benefit is lower noise. The
“flat” position provides a smooth, flat high-frequency response for natural sound reproduction.
Capable of withstanding up to 150 dB SPL without distortion, the PZM will never overload in
practical use. Its electret condenser capsule
provides a wide, smooth frequency response
from 20 Hz to 20 kHz. Self noise is low, and
sensitivity is high enough to override mixer
noise in distant-miking applications.
Like other Pressure Zone Microphones, the 6D
utilizes the Pressure Recording Process™ in
which a miniature condenser microphone capsule is arranged very close to a sound-reflecting
plate or boundary. The capsule is mounted in the
“Pressure Zone” just above the boundary, a
region where sound coming directly from the
sound source combines in phase with sound
reflected off the boundary. The benefits are a
wide, smooth frequency response free of phase
interference, excellent clarity and “reach,” a
hemispherical polar pattern and uncolored offaxis response.
Operating Instructions
The PZM-6D features self-contained electronics
in the attached XLRM connector housing, which
allows it to plug directly into a standard 12-48
VDC phantom power supply.
Crown makes an AC-powered model PH-4B
supply for powering up to four PZMs. Also available is a single-channel AC/battery supply,
Crown model PH-1A. For special applications,
you can make your own battery supply as suggested in Fig. 3.
Using 2-conductor shielded microphone cable,
plug the microphone into a phantom power supply. Connect the power supply output to a
PRESSURE ZONE
MICROPHONE
Specifications
Type: Pressure Zone Microphone.
Transducer: Electret condenser.
Frequency response: 20 Hz to 20 kHz. See Fig. 1.
Polar pattern: Hemispherical when used on a floor,
wall or ceiling.
Open circuit sensitivity: 7 mV/Pa* (–43 dB re 1
volt/Pa).
Power sensitivity: –43 dB re 1 mW/Pa. EIA sensitiv-
ity: –135 dBm.
Impedance: 240 ohms, balanced. Recommended
minimum load impedance 1000 ohms.
Self-Noise: 20 dB equivalent sound pressure level,
A-weighted.
S/N ratio: 74 dB at 94 dB SPL.
Maximum Sound Pressure Level: 150 dB SPL at the
microphone produces 3% THD.
Polarity: Positive pressure on the diaphragm pro-
duces positive voltage on pin 2 with respect to pin
3 of the output connector.
Operating voltage: Phantom power, 12-48 volts DC,
positive voltage on pins 2 and 3 with respect to pin
1 of the output connector.
Current drain: 1.1 mA.
Cable: Permanently attached 15-foot (4.58-m) black
cable with an XLRM connector.
Switch: Frequency-response select switch for rising
or flat response.
Color: Black.
Dimensions: 3-in. x 2.5-in. x .375-in. (7.62-cm x
6.35-cm x .95-cm). See Fig. 2.
Included accessories: PZM windscreen, carrying
pouch.
Optional accessories: PH-4B phantom power supply
(4 channels, AC powered). PH-1A phantom power
supply (1 channel, battery or AC-adapter powered).
* 1 pascal = 10 dynes/cm2 = 10 microbars = 94 dB SPL.
®
Fig. 1
+15
+10
+5
dB
0
–5
–10
–15
–20
–25
–30
–35
20 100 1K
Frequency in Hz
Legend –––––––––– RISING
Low frequency response depends on size of surface.
Fig. 2
- - - - - - - - - FLAT
FLAT
3 in.
(7.62 cm)
2.5 in.
(6.35 cm)
3.8 in.
3.8"
(9.65 cm)
RISING
RISING
FLAT
.375 in.
(0.95 cm)
.750 in.
.750" DIA.
(1.91 cm)
10K
2.5 in.
(6.35 cm)
DIA.
(
)
®
PZM -6D
mixer input, or if your mixer has phantom power
built in, simply plug the PZM direct into a mixer
mic input.
Fig. 3
1
TO MIC
1
TO MIC
3
MATCH RESISTORS WITHIN 1%
2
3
2
1:1 XFMR
CT
+
18V (TWO 9-V ALKALINE)
100mF 25V
+
1K
100mF 25V
1K
+
+
18V (TWO 9-V ALKALINE)
2
3
2
3
10 OHMS
1
1
TO MIXER
MIC INPUT
TO MIXER
MIC INPUT
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, nonabsorbent boundary (or surface). Typical boundaries 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
is placed. Specifically, the response begins to
shelve down at and below the frequency F,
where F = 750/D, and D = the boundary dimension in feet. At approximately F = 188/D, the
output of the microphone is down 6 dB, becomes omnidirectional, and maintains a flat
response down to approximately 30 Hz.
Several placement examples are described in
Crown Boundary Mic Application Guide
the
,
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 subminiature electret type of rugged construction. 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 coherency, thus eliminating comb filtering in the
audible spectrum.
Permanently attached to the microphone is a
fifteen-foot black cable with an XLRM connector.
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). Equivalent noise shall be typically 20 dBA re .0002
2
dyne/cm
. The Crown PZM-6D 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 sheet for more detail.
Service
If the microphone does not function properly,
check that it is placed correctly and is connected as described in the Operating Instructions. 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 800342-6939.
PZM-6D Schematic
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
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