Crown Audio PCC-170 - Manual

POLAR
PATTERN
PCC
®
-170
PCC-170W
PHASE COHERENT CARDIOID
MICROPHONE
Horizontal-Plane Polar Response
Fig. 3
Fig. 1
Frequency Response
T 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 in-
clude churches, courtrooms and council chambers.
Because of its highly directional pickup pattern, the
PCC-170 minimizes background noise and feed-
back. 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 refl ected sounds
arrive at the diaphragm in-phase. This coherent
addition of direct and refl ected 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 mic-
level 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 0.25-in. (0.635-cm) stereo phone
plug on the bottom of the base plate as the PCC-
170SPP.
The PCC-170W is fi nished 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 particu-
lar 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 fl at low-frequency
response, for normal usage. The PCC-170 is
shipped from the factory in fl at 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 fl at response
at high frequencies. You can raise or lower the
high-frequency response for special applications.
Please follow this procedure:
(Continued on back)
Specifi cations
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 typi-
cal (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 produc-
es 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 0.25-in. (0.635-cm) 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).
*1 pascal = 10 dynes/cm 2 = 10 microbars = 94 dB SPL.
Frequency in Hz
Features
Perfect for multimiking applications in telecon-
ferencing, distance learning, boardrooms and
courtrooms
Phase Coherent Cardioid design prevents color-
ation from surface sound refl ections
Half-supercardioid polar pattern reduces
ambient noise and room reverberation
Small and inconspicuous
Available in black (PCC-170) or white (PCC-
170W)
Vertical-Plane Polar Response
Fig. 2