Crown PCC-170SWO Quick Start Manual

®
PCC-170SWO
T
he Crown PCC-170SWO is a surface-
mounted supercardioid microphone for
distance learning or similar applications.
The user can turn the mic on and off by pressing
a membrane switch on the mic. A pair of extra
leads in the mic cable allows remote sensing of
the switch closure. In a typical distance-learning
application, a video camera would track to the
person who switched on the microphone.
The mic includes a bass-tilt switch, which lets
the user tailor the low-end response for particu-
lar applications. A high-frequency adjust is also
provided.
The membrane switch can be configured for
touch on/off, momentary on, or momentary off
Operation. This configuration is set by a bottom-
mounted DIP switch. A high-intensity LED lights
when the unit is on.
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.

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 response as
shown in Fig. 1.
• The FLAT position provides a flat low-frequency
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.
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:
1. Touch on/off. Touch the switch to turn on the
mic; touch it again to turn off the mic.
2. Momentary on. Touch and hold the switch to
momentarily turn on the mic. Release the switch
to turn the mic back off.
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 serves as a
cough button or privacy button.
PHASE COHERENT
CARDIOID ® MICROPHONE

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.
Equivalent noise level (self noise): 22 dB SPL typical
(0 dB = .0002 dyne/cm 2 ), 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: 4.5 mA nominal.
Cable: 15-foot, black, integral to microphone,
unterminated.
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.
White: Audio opposite-polarity.
Red: Remote contact-closure sensing, +DC.
Black: Remote contact-closure sensing, –DC.
Materials: High-impact molded plastic and steel mesh
grille.
Finish: Satin black.
Net weight: 6 oz. (170 g).
Dimensions: See Fig. 4.
Optional accessories: Crown PH-1A phantom power
supply (one channel, battery or AC-adapter
powered). Crown PH-4B phantom power supply
(four channels, AC powered).
Fig. 1
Frequency Response
+15
+10
BOOST
+5
dB 0
–5
FLAT
CUT
–10
–15
–20
135°
–25
–30
–35
20 100 1K
Frequency in Hz
Fig. 2
Vertical Plane Polar Response
60° 90°
30°
FRONT
0°
-0 -10
+ 5 -5 -15 -20
Fig. 3
Horizontal Plane Polar Response
330° 0°
FRONT
-0 dB
300°
-5
-10
-15
-20
270°
240°
REAR
210° 180°
2
*1 pascal = 10 dynes/cm = 10 microbars = 94 dB SPL.
www.audiovias.com
BOOST
CUT
10K
120°
200 Hz - 4 kHz
150°
REAR
180°
30°
60°
90°
120°
300 Hz-4 kHz
150°