Crown Audio Microphone PZM 11 User Manual

POLAR  
PATTERN  
PRESSURE ZONE  
MICROPHONES  
PZM®-11  
PZM-11LL  
he Crown® PZM®-11 or PZM-11LL is a  
Pressure Zone Microphone® designed for  
conference-room, security and surveillance  
Features  
Low-impedance screw-terminal output  
Inconspicuous  
PZM-11 is mic level; PZM-11LL is line level  
Ideal for security, surveillance and confer-  
rence rooms  
Clear, articulate sound  
T
applications. Each can be mounted in the ceiling or  
wall in a standard electrical outlet box. Providing  
excellent intelligibility, the PZM-11 and  
PZM-11LL are designed to look like a light switch  
so as not to draw attention.  
Net weight: 2.5 oz. (71 g).  
Dimensions: See Fig. 2.  
Optional accessories: Crown PH-1A phantom power  
supply (1 channel, AC-adapter powered).  
Specifications  
Type: Pressure Zone Microphone.  
Element: Electret condenser.  
Frequency response (typical): 80 Hz to 20,000 Hz.  
See Fig. 1.  
Polar pattern: Hemispherical.  
Impedance:  
PZM-11: 225 ohms, balanced.  
PZM-11LL: 75 ohms, balanced.  
Recommended minimum load impedance 1000  
ohms.  
Open circuit sensitivity:  
PZM-11: 5 mV/Pa* (–46 dBV/Pa).  
PZM-11LL: 1.4V/Pa* (+3 dB re 1V/Pa).  
Power sensitivity:  
PZM-11: –45.5 dBm/Pa*  
PZM-11LL: +8 dBm/Pa*.  
The PZM-11 has a mic-level output and is powered  
by 12-48V phantom power.  
The PZM-11LL has a line-level output and can be  
powered by 24V AC, 12-24V DC, or 12-48V phan-  
tom power. Since the PZM-11LL has a high output,  
it can be plugged directly into a VCR line input—no  
costly mic preamp is needed.  
*1 pascal = 10 dynes/cm2 = 10 microbars = 94 dB SPL.  
To phantom power the PZM-11LL, a modification  
will have to be made to the electronics module (see  
Installation Step 3 for details).  
Fig. 1.  
Frequency Response  
+15  
+10  
Like other Pressure Zone Microphones, the  
PZM-11and PZM-11LL utilize the Pressure Re-  
cording Processin which a miniature condenser  
microphone capsule is mounted 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,” and con-  
sistent pickup anywhere around the microphone.  
+5  
dB 0  
5
10  
15  
20  
25  
30  
35  
Equivalent noise level (self-noise): 26 dB SPL typi-  
cal (0 dB = .0002 dyne/cm2), A-weighted.  
S/N Ratio: 68 dB at 94 dB SPL.  
Maximum SPL:  
PZM-11: 120 dB SPL produces 3% THD.  
PZM-11LL: 100 dB SPL produces 3% THD.  
10K  
20  
100  
1K  
Frequency in Hz  
Output connector: Three screw terminals.  
1 = ground, 2 = audio hot (in polarity),  
3 = audio cold (opposite polarity).  
Polarity: Positive pressure on the diaphragm pro-  
duces a positive voltage on screw terminal 2 with  
respect to screw terminal 3.  
In the PZM-11and PZM-11LL, low frequencies  
below the voice range are rolled off to reduce  
pickup of air-conditioning rumble. The high-fre-  
quency response is boosted slightly to aid clarity  
and articulation.  
Fig. 2.  
Dimensions  
The microphone connector is a row of screw termi-  
nals for easy installation. The output is balanced,  
low impedance, which allows long cable runs  
without hum pickup or high-frequency loss.  
Operating voltage:  
PZM-11: Standard phantom power, 12 to 48V DC  
on screw terminals 2 and 3 with respect to screw  
terminal 1.  
PZM-11LL: 24V AC, 12-24V DC, or phantom  
power as the PZM-11LLS2.  
Installation  
1. Please refer to Fig. 3 (PZM-11) or Fig. 4 (PZM-  
11LL) and locate all the parts shown.  
Current drain:  
PZM-11: 400 microamperes.  
PZM-11LL: 4 milliamperes.  
Materials: Steel plate and high-impact plastic  
capsule holder.  
Finish: Off-white. May be painted any color; take  
care to first seal the opening between the mic  
capsule and boundary plate.  
Operating Temperature Range: –10° to +60° C  
(+14° to +140° F).  
2. Run a 2-conductor shielded mic cable to the  
hole where you intend to install the microphone.  
Install a standard electrical outlet box in the hole.  
To use phantom power, you need a mixer with  
phantom power or an external phantom-power  
supply. Crown makes a PH-1A phantom power  
supply which has 1 channel and is AC-adapter  
powered.  
(Continued on back)  
 

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