Crown PZM-30D Manual

®
PZM-30D
T
® ®
he Crown PZM -30D is a Pressure Zone
Microphone ® designed for professional
recording, sound reinforcement and broad-
casting. It has many applications, from miking
full orchestras or individual musical instruments
to security or teleconferencing.
The PZM-30D has a switchable dual frequency
response: rising (R) or flat (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 frequencies
on the recording console; the result is lower
noise. The "flat" position provides a smooth,
flat, high-frequency response for natural sound
reproduction.
These sturdy microphones are especially reli-
able because they can be used with a rugged
detachable cable. The output 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 ™ utilizes the Pressure Recording Pro-
cess in which a miniature condenser micro-
phone capsule is positioned 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 excellent clarity and "reach," a
hemispherical polar pattern, uncolored off-axis
response, and a wide smooth frequency re-
sponse free of phase interference.
Operating Instructions
The PZM-30D features self-contained electron-
ics which allows it to plug directly into a stan-
dard 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 sug-
gested in Fig. 3 on the reverse side.
Using two-conductor shielded microphone
cable, plug the microphone into a phantom
power supply. Connect the power supply output
to a mixer mic input, or if your mixer has phan-
tom power built in, simply plug the PZM directly
into a mixer mic input.
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
sensitivity –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
produces 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: None supplied; use 2-conductor shielded
microphone cable.
Switch: Frequency-response select switch for rising
or flat response.
Color: Black.
Weight: 6.5 ounces (184 grams).
Dimensions: 6-in. x 5-in. x .75-in. (15.2 cm x 12.7
cm x 1.9 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/cm 2 = 10 microbars = 94 dB SPL.
Fig. 1
Frequency Response
Frequency in Hz
Legend –––––––––– RISING
- - - - - - - - - FLAT
Low-frequency response depends on size of surface.
Fig. 2