@crown
T
PHASE COHERENT
CARDIOID
®
MICROPHONE
PCC-170W
PCC-170
®
®
he Crown PCC-170 is a surface-mounted
supercardioid microphone of professional
quality. This handsomely styled unit is
appropriate for use on the most elegant
boardroom table or lectern. Other applications
include churches, courtrooms and council cham-
bers.
Because of its highly directional pickup pattern,
the PCC-170 minimizes background noise and
feedback. The microphone reproduces the voice
with a clean, clear and natural sound.
Since the microphone capsule is placed on a
boundary or surface, direct and reflected sounds
arrive at the diaphragm in-phase. This coherent
addition of direct and reflected waves increases
sensitivity 6 dB and prevents phase cancellations.
The mic capsule is small enough to ensure phase
coherency up to the highest frequencies in the
audible spectrum, resulting in a wide, smooth
frequency response free of phase interference.
Clarity and reach are also enhanced.
Self-contained electronics eliminate the need for
an in-line preamp. Powered by 12-48V phantom
power, the PCC-170 has a low-impedance
balanced output which permits long cable runs
without hum pickup or high-frequency loss.
Although the standard connector option is a
Switchcraft TB3M, the microphone can be
special-ordered with a
1
¦
4
" stereo phone plug on
the bottom of the base plate as the PCC-170/SPP.
The PCC-170W is finished in off-white to blend
with church altars and other surroundings where
the lighter color is appropriate.
RFI suppression is included. Self-noise is low
and sensitivity is very high. A bass-tilt switch
allows the user to tailor the low-end response for
particular applications.
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, which is normal usage. The PCC-170 is
shipped from the factory in 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.
How to Adjust the High-Frequency Response
The microphone is factory-set for flat response at
high frequencies. You can raise or lower the
high-frequency response for special applications.
Please follow this procedure:
1. On the bottom of the microphone, find the
hole labeled HF ADJ. This trim pot adjusts the
high-frequency response as shown in Fig. 1.
Specifications
Type: Phase Coherent Cardioid
®
.
Element: Electret condenser.
Frequency response (typical): 50 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 (typical): 22 mV/Pa* (-33
dB re 1 volt/Pa).
Power sensitivity: -30.5 dB re 1 mW/Pa*. EIA
rating -125 dBm.
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, 12 to 48 volts
DC on pins 2 and 3 with respect to pin 1.
Current drain: 4 mA nominal.
Connector:
Switchcraft TB3M in model PCC-170.
Bottom-mounted
1
¦
4
" stereo phone plug in model
PCC-170/SPP. See Fig. 7.
Cable:
15-foot, black, two-conductor shielded cable
with Switchcraft TA3F and A3M connectors. No
cable supplied with SPP option.
Materials: High-impact molded plastic and steel
mesh grille.
Finish: PCC-170: black. PCC-170W: off-white.
Net weight:
6 oz. (170 g).
Dimensions:
See Figs. 4 and 7.
Optional accessories:
Crown PH-1A phantom
power supply (single channel, battery or AC
adapter powered), Crown PH-4B phantom power
supply (4 channels, AC powered).
*1 pascal = 10 dynes/cm
2
= 10 microbars = 94 dB SPL.
Fig. 1
Fig. 3
Fig. 2
Frequency in Hz
Frequency Response
–20
–25
–30
–35
20
100
1K
+15
+10
+5
dB 0
–5
–10
–15
10K
BOOST
FLAT
CUT
135°
BOOST
CUT
FRONT
REAR
-20
-15
-10
-5
-0
60°
90°
120°
150°
180°
0°
30°
200 Hz - 4 kHz
+
5
Vertical-Plane Polar Response
FRONT
REAR
-20
-15
-10
-5
-0 dB
60°
90°
120°
150°
180°
210°
240°
270°
300°
0°
30°
330°
300 Hz-4 kHz
Horizontal-Plane Polar Response
