Owners Manual
®
T
PZM30 D
he PZM30 D is a Pressure Zone
Microphone
®
designed for professional
recording, sound reinforcement and
broadcasting. It has many applications, from
miking full orchestras or individual musical
instruments to security or teleconferencing.
The PZM30 D 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
reliable 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
PZM30 D
utilizes the Pressure Recording
Process in which a miniature condenser
microphone 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 a wide, smooth
frequency response free of phase interference,
excellent clarity and “reach,” a hemispherical
polar pattern, and uncolored off-axis response.
Operating Instructions
The PZM30 D features self-contained
electronics which allows it to plug directly into
a standard 12-48 VDC phantom power supply.
AKG/Crown makes an AC-powered model
PH4B
supply for powering up to four PZMs.
Also available is a single-channel AC/battery
supply, AKG/Crown model PH1A. For special
applications, you can make your own battery
supply as
suggested 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
phantom power built in, simply plug the PZM
directly into a mixer mic input.
®
PRESSURE
ONE
MICROPHONE
Specifications
Fig. 1
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:
PH4B phantom power supply
(4 channels, AC powered). PH1A phantom power
supply (1 channel, battery or AC-adapter
powered).
Low
Fig. 2
*1 pascal = 10 dynes/cm
2
= 10 microbars = 94 dB SPL.
Frequency Response
Frequency in Hz
Legend –––––––––– RISING
- - - - - - - - - FLAT
Low
-frequency response depends on size of surface.