Crown 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