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

POLAR

PATTERN

PHASE COHERENT

CARDIOID® MICROPHONE

PCC®-170SWO

The 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 press- ing a membrane switch on the mic. A pair

of extra leads in the mic cable allow isolated remote sensing of the microphone switch clo- sure. In a typical distance-learning application, a video camera would track to the person who switched on the microphone.

Features
• Ideal for distance learning applications		• Half-supercardioid polar pattern reduces
•	Programmable on/off switch	•	pickup of muddy-sounding room acoustics
•	Extra leads in mic cable allow remote		Bass-tilt switch
	sensing of mic switch closure	•	Adjustable high-frequency response

The mic includes a bass-tilt switch, which lets the user tailor the low-end response for par- ticular 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 bot- tom-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 re- sponse as shown in Fig. 1.

•The FLAT position provides a flat low-fre- quency 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

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/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 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: 6.8 mA nominal.

Cable: 15-foot, black, integral to microphone, unter- minated.

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.

Operating temperature range: –10° to +50° C, or +14° to +122° F.

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).

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

Fig. 1

Frequency Response

Fig. 2

Vertical Plane Polar Response

Fig. 3

Horizontal Plane Polar Response