Crown Audio PZM-30D - Manual

POLAR
PATTERN
Specifi cations
PZM
®
-30D
PZM-6D
PRESSURE
ZONE
MICROPHONES
Type: Pressure Zone Microphone.
Transducer: Electret condenser.
Frequency response: 20 Hz to 20 kHz. See Fig. 1.
Polar pattern: Hemispherical when used on a fl oor,
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 to 48 volts
DC, positive voltage on pins 2 and 3 with respect
to pin 1 of the output connector.
Current drain: 1.1 mA.
Connector: Male 3-pin XLR-type.
Cable:
PZM-30D: None supplied; use 2-conductor
shielded microphone cable.
PZM-6D: Permanently attached 15-foot (4.58-m)
black cable with XLRM connector. Model
PZM-6DS2 has a 6-foot (1.83-m) cable, and can
be special-ordered from your Crown dealer.
Switch: Frequency-response select switch for rising
or fl at response.
Color: Black.
Weight: 6.5 ounces (184 grams).
Dimensions:
PZM-30D: 6 in. x 5 in. x .75 in. (15.2 cm x 12.7 cm
x 1.9 cm). See Fig. 2.
PZM-6D: 3 in x 2.5 in. x .375 in. (7.62 cm x 6.35
cm x .95 cm). See Fig. 3.
Included accessories: PZM windscreen, carrying
pouch.
Optional accessories: PH-1A phantom power supply
(1 channel, battery or AC-adapter powered).
Fig. 2
Low-frequency response depends on size of surface.
T he Crown ® PZM ® -30D is a Pressure Zone
Microphone ® and the PZM-6D is a Pres-
sure Zone Microphone. Both are designed
for professional recording, sound reinforce-
ment and broadcasting. It has many applica-
tions, from miking full orchestras or individual
musical instruments to security or teleconfer-
encing.
Each mic has a switchable dual frequency
response: rising (R) or fl at (F). 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 fre-
quencies on the recording console; the result
is lower noise. The “fl at” position provides a
smooth, fl at, high-frequency response for natu-
ral sound reproduction.
The PZM-30D is sturdy and reliable because it
can be used with a rugged detachable cable.
The PZM-6D has a smaller plate. Its low pro-
fi le, unobtrusive appearance is appreciated in
conference rooms, as well as on television,
fi lm and video productions. When suspended
over an orchestra on a clear panel, the PZM-6D
practically disappears. Its miniature, perma-
nently attached 15-foot cable also reduces
visual clutter. Model PZM-6DS2 has a 6-foot
cable, and can be special-ordered from your
Crown dealer.
The output of either mic is a male 3-pin XLR-
type, balanced and low impedance, which
permits long cable runs without hum pickup or
high-frequency loss.
Like other Pressure Zone Microphones, the
PZM-30D and PZM-6D utilize the Pressure
Recording Process in which a miniature con-
denser microphone capsule is positioned very
close to a sound-refl ecting plate or bound-
ary. 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 refl ected off
the boundary. The benefi ts are excellent clarity
and "reach," a hemispherical polar pattern, un-
colored off-axis response, and a wide smooth
frequency response free of phase interference.
Operating Instructions
The PZM-30D and PZM-6D feature self-con-
tained electronics which allows them to plug
directly into a standard 12-48 VDC phantom
power supply.
Available from Crown is a single-channel AC/
battery phantom-power supply, model PH-1A.
For special applications, you can make your
own battery supply as suggested in Fig. 4.
*1 pascal = 10 dynes/cm 2 = 10 microbars = 94 dB SPL.
Fig. 1
Frequency in Hz
Legend –––––––––– RISING
- - - - - - - - - FLAT
Frequency Response
Features
Pressure Zone Microphone design prevents
coloration from surface sound refl ections
Choice of fl at response or rising high-
frequency response
PZM-30D uses a rugged detachable cable.
PZM-6D is smaller, lighter, and has a per-
manently attached cable
Hemispherical pickup pattern
PZM-30D Dimensions
PZM-30D PZM-6D