Crown Audio Microphone PCC 170SWO User Manual

POLAR  
PATTERN  
PHASE COHERENT  
CARDIOID® MICROPHONE  
®
PCC -170SWO  
he Crown® PCC-170SWO is a surface-  
mounted supercardioid microphone for  
T
distance learning or similar applications.  
The user can turn the mic on and off by press-  
ing a membrane switch on the mic. A pair  
of extra leads in the mic cable allow isolated  
remote sensing of the microphone switch clo-  
sure. In a typical distance-learning application,  
a video camera would track to the person who  
switched on the microphone.  
Features  
Ideal for distance learning applications  
Programmable on/off switch  
Half-supercardioid polar pattern reduces  
pickup of muddy-sounding room acoustics  
Bass-tilt switch  
Adjustable high-frequency response  
Extra leads in mic cable allow remote  
sensing of mic switch closure  
The mic includes a bass-tilt switch, which lets  
the user tailor the low-end response for par-  
ticular applications. A high-frequency adjust is  
also provided.  
power supply (one channel, battery or AC-adapter  
powered).  
*1 pascal = 10 dynes/cm2 = 10 microbars = 94 dB SPL.  
Specifications  
Element: Electret condenser.  
Frequency response (typical): 40 Hz to 20,000 Hz at  
30 degrees incidence to surface. See Fig. 1.  
Polar pattern: Half-supercardioid (supercardioid in  
the hemisphere above the primary boundary). See  
Figs. 2 and 3.  
Impedance: 150 ohms, balanced. (Recommended  
load impedance 1000 ohms or greater.)  
Open-circuit sensitivity: 22 mV/Pa* (–33 dB re  
1 V/Pa*).  
Power sensitivity: –30.5 dB re 1 milliwatt/Pa*.  
–125 dBm EIA rating.  
The membrane switch can be configured for  
touch on/off, momentary on, or momentary off  
operation. This configuration is set by a bot-  
tom-mounted DIP switch. A high-intensity LED  
lights when the unit is on.  
Fig. 1  
Frequency Response  
The mic can be set to be always on. In this  
mode, the switch only activates the remote  
sensing and LED. This is useful when using an  
external gated mixer (automatic mixer).  
Remote sensing is done by a patented opto-  
coupled MOS switching circuit. At the remote-  
sensing leads, the resistance goes low when  
the mic is on. The microphone is attenuated 70  
dB when the switch is off.  
Equivalent noise level (self noise): 22 dB SPL typical  
(0 dB = .0002 dyne/cm2), A-weighted.  
S/N ratio: 72 dB at 94 dB SPL.  
Maximum SPL: 120 dB SPL produces 3% THD.  
Polarity: Positive pressure on the diaphragm produces  
positive voltage on pin 2 with respect to pin 3.  
Operating voltage: Phantom power: 24 to 48 volts DC  
positive on pins 2 and 3 with respect to pin 1.  
Current drain: 6.8 mA nominal.  
Fig. 2  
Vertical Plane Polar Response  
How to Set the Bass Tilt Switch  
On the bottom of the microphone is a BASS-  
TILT switch with three positions: FLAT, CUT,  
and BOOST. It adjusts the low-frequency re-  
sponse as shown in Fig. 1.  
• The FLAT position provides a flat low-fre-  
quency response, (normal operation). The mic  
is shipped from the factory in the flat position.  
• The CUT position rolls off the bass, useful in  
noisy or boomy surroundings.  
• The BOOST position boosts the bass for a  
more natural sound when the mic is used on a  
small surface such as a lectern.  
Cable: 15-foot, black, integral to microphone, unter-  
minated.  
Off-attenuation: 70 dB at 1 kHz.  
Maximum voltage and current which may be applied  
to remote sensing contact-closure leads: 350 V,  
200 mA. Small voltages are recommended; large  
voltage changes may induce noise in audio output.  
On-resistance: 7 to 10 ohms with the included 15-foot  
cable.  
Cable wiring:  
Shield: Audio shield.  
Green: Audio in-polarity.  
Fig. 3  
Horizontal Plane Polar Response  
You can also adjust the high-frequency re-  
sponse. Insert a small screwdriver into the hole  
labeled “HF ADJ” on the bottom of the mic.  
How to Configure the Membrane Switch  
The membrane switch can be programmed to  
work three ways:  
White: Audio opposite-polarity.  
Red: Remote contact-closure sensing, +DC.  
Black: Remote contact-closure sensing, –DC.  
1. Touch on/off. Touch the switch to turn on  
the mic; touch it again to turn off the mic.  
Operating temperature range: –10° to +50° C, or  
+14° to +122° F.  
2. Momentary on. Touch and hold the switch  
to momentarily turn on the mic. Release the  
switch to turn the mic back off.  
Materials: High-impact molded plastic and steel mesh  
grille.  
Finish: Satin black.  
3. Momentary off. Touch and hold the switch  
to momentarily turn off the mic. Release the  
switch to turn the mic back on. This option  
Net weight: 6 oz. (170 g).  
Dimensions: See Fig. 4.  
Optional accessories: Crown PH-1A phantom  
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