Crown Audio Microphone PZM 20R User Manual

POLAR  
PATTERN  
PRESSURE  
ZONE  
MICROPHONE  
®
PZM-20R  
PZM-20RW  
he Crown® PZM-20R is a Pressure  
Zone Microphone® designed for per  
T
manent flush-mounting in tables,  
lecterns, pulpits, and judicial benches. Its  
unobtrusive appearance and hemispherical  
pickup pattern make it ideal for conference  
table use. The microphone fits into a 4.59-in.  
(11.659-cm) square hole or in a standard  
4.0-in. x 4.0-in. (10.16-cm x 10.16-cm) elec-  
trical outlet box.  
Features  
Frequency response tailored for speech  
clarity  
For permanent flush-mounting in tables  
Low-frequency rolloff reduces air-handling  
noise  
Hemispherical polar pattern picks up every-  
one around the microphone  
Electronics in the base of the 20R adapt the  
microphone for phantom powering. No ex-  
ternal power-supply interface is required. The  
microphone plugs directly into a phantom  
power supply providing 12 to 48 volts.  
The wide-range frequency response of the  
20R is emphasized at high frequencies for  
clarity and articulation. Low frequencies be-  
low the voice range are filtered out to reduce  
rumble.  
Screw terminals provide low-cost connec-  
tions  
Fig. 1  
Specifications  
Frequency Response  
Type: Pressure Zone Microphone.  
+15  
+10  
Element: Electret condenser.  
Frequency response (typical): 80 Hz to 20 kHz (see  
Fig. 1).  
Polar pattern: Hemispherical on an infinite plane.  
Open circuit sensitivity: 7 mV/Pa* (–43 dB re 1  
volt/Pa).  
+5  
dB 0  
–5  
–10  
–15  
–20  
Three small guard-posts prevent papers from  
sliding underneath the cantilever arm and  
altering the frequency response.  
Power sensitivity: –43 dB re 1 mW/Pa. EIA sensitiv-  
–25  
–30  
ity –135 dBm.  
–35  
20  
Impedance: 240 ohms balanced. Recommended  
minimum load impedance 1000 ohms.  
10K  
100  
Frequency in1HK z  
Like other Pressure Zone Microphones,  
the 20R utilizes the Pressure Recording  
Process™ in which a miniature condenser  
microphone capsule is arranged 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.  
Equivalent noise level: 20 dB SPL (0 dB = 0.0002  
Low frequency response depends on size of surface.  
dyne/cm2), A-weighted.  
S/N ratio: 74 dB at 94 dB SPL.  
Maximum SPL: 150 dB SPL at the microphone pro-  
duces 3% THD.  
Polarity: Positive pressure on the diaphragm pro-  
duces positive voltage on terminal 2 with respect to  
terminal 3 of the output terminal strip.  
Operating voltage: Phantom power, 12 to 48 volts  
DC, positive voltage on terminals 2 and 3 with re-  
spect to terminal 1 of the output terminal strip.  
Current drain: 1.1 mA.  
Color: Black.  
Connector: Screw terminals. #1 shield, #2 audio in-  
polarity, #3 audio return.  
Cable: None supplied; use 2-conductor shielded mi-  
crophone cable.  
Fig. 2A  
.250 in.  
.635 cm  
.187 in.  
.475 cm  
1.1 in.  
2.695 cm  
4.58 in.  
11.63 cm  
Suggestions For Use  
Weight: 8.1 ounces (230 grams).  
Dimensions: See Figs. 2A and 2B.  
Optional accessories: Crown PH-1A phantom power  
supply (single channel, battery or AC adapter  
powered).  
The PZM-20R differs from other PZMs in that  
it is a stationary microphone, generally not  
moved from one location to another. Before  
installing it, first check that the pickup will  
be adequate by testing a regular PZM placed  
where you plan to install the 20R.  
3.42 in.  
8.69 cm  
4.58 in.  
11.63 cm  
Avoid areas where items might be placed on  
top of the microphone. Once you’ve decided  
on the microphone position, rout a recessed  
hole according to the dimensions in Fig. 2B  
on the reverse side.  
3.42 in.  
8.69 cm  
*1 pascal = 10 dynes/cm2 = 10 microbars = 94 dB SPL.  
 

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