Crown Audio specifications PCC-170 PCC-170W, Features, How to Set the Bass Tilt Switch

POLAR

PATTERN

PHASE COHERENT CARDIOID

MICROPHONE

PCC®-170

PCC-170W

The 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 reflected sounds arrive at the diaphragm in-phase. This coherent addition of direct and reflected waves increases sensitivity 6 dB and prevents phase cancellations.

Features
Perfect for multimiking applications in telecon-	Half-supercardioid polar pattern reduces
ferencing, distance learning, boardrooms and	ambient noise and room reverberation
courtrooms	Small and inconspicuous
Phase Coherent Cardioid design prevents color-	Available in black (PCC-170) or white (PCC-
ation from surface sound reflections	170W)

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 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 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 flat low-frequency response, for 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

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 typi- cal (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 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).

Fig. 1

Frequency Response

Frequency in Hz

Fig. 2

Vertical-Plane Polar Response

Fig. 3

Horizontal-Plane Polar 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:

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*1 pascal = 10 dynes/cm2 = 10 microbars = 94 dB SPL.