Data Sheet

SpSpSpecifications:
Polar pattern: hemispherical
Frequency response: 20 Hz to 20,000 Hz
Impedance: 240 ohms
Maximum SPL: 150 dB
Finish: black
Cable: PZM-30D: None supplied; use 2-conductor
Shielded microphone cable.
PZM-6D: Permanently attached
4.58-m (15-foot) black cable with XLRM
connector. Model PZM-6D has a
1.83 m (6-foot) cable.
Net weight: 184 grams (6.5 ounces)
Item number: PZM-6D 6000H50010
PZM-30D 6000H50020
Boundary Layer Microphones
Operating Instructions
The PZM
® -30D and PZM® -6D feature self-contained electronics which allows them to plug
directly into a standard 12-48 VDC phantom power supply. Using a 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.
If your mixer or recorder requires an unbalanced phone plug connector, modify the cable
leaving 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
boundaries are a floor, wall, ceiling, or table. This type of mounting improves the 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 omni
directional, and maintains a flat response down to approximately 30 Hz.
Architects’ and Engineers’ Specifications
PZM
® -30D: The microphone shall be the PZM® -30D 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.
The PZM
® -30D 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 dyne/ cm2. The microphone color shall be black. The microphone connector shall be a male 3-pin XLR-
type. The Crown PZM-30D is specified.
PZM
® -6D: 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 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 dyne/ cm2. The microphone color shall be black. The microphone connector shall
be a male 3-pin XLR-type.
The PZM
®
-
6D is specified.