Crown PZM-6D specifications Operating Instructions, Open circuit sensitivity 7 mV/Pa* -43 dB re

PRESSURE ZONE

MICROPHONE®

PZM®-6D

The PZM-6D is a Pressure Zone Microphone designed for professional recording, sound reinforcement, teleconferencing and broad-

casting. Its low profile, unobtrusive appearance is appreciated in conference rooms, as well as on television, film and video productions. When suspended over an orchestra on a clear panel, the PZM practically disappears. Its miniature, permanently attached cable also reduces visual clutter.

The PZM-6D has a switchable dual frequency response: rising or flat. The “rising” position adds brilliance. This makes it useful wherever a crisp attack is desired, such as on percussion, drums or piano. The user can get a bright sound without boosting high frequencies on the re- cording console; the benefit is lower noise. The “flat” position provides a smooth, flat high-fre- quency response for natural sound reproduc- tion.

Capable of withstanding up to 150 dB SPL with- out distortion, the PZM will never overload in practical use. Its electret condenser capsule provides a wide, smooth frequency response from 20 Hz to 20 kHz. Self noise is low, and sensitivity is high enough to override mixer noise in distant-miking applications.

Like other Pressure Zone Microphones, the 6D utilizes the Pressure Recording Process™ in which a miniature condenser microphone cap- sule is arranged very close to a sound-reflecting plate or boundary. The capsule is mounted in the “Pressure Zone” just above the boundary, a region where sound coming directly from the sound source combines in phase with sound reflected off the boundary. The benefits are a wide, smooth frequency response free of phase interference, excellent clarity and “reach,” a hemispherical polar pattern and uncolored off- axis response.

Operating Instructions

The PZM-6D features self-contained electronics in the attached XLRM connector housing, which allows it to plug directly into a standard 12-48 VDC phantom power supply.

Crown makes an AC-powered model PH-4B supply for powering up to four PZMs. Also avail- able is a single-channel AC/battery supply, Crown model PH-1A. For special applications, you can make your own battery supply as sug- gested in Fig. 3.

Using 2-conductor shielded microphone cable,

Specifications

Type: Pressure Zone Microphone.

Transducer: Electret condenser.

Frequency response: 20 Hz to 20 kHz. See Fig. 1.

Polar pattern: Hemispherical when used on a floor, wall or ceiling.

Open circuit sensitivity: 7 mV/Pa* (–43 dB re 1

volt/Pa).

Power sensitivity: –43 dB re 1 mW/Pa. EIA sensitiv-

ity: –135 dBm.

Impedance: 240 ohms, balanced. Recommended minimum load impedance 1000 ohms.

Self-Noise:20 dB equivalent sound pressure level, A-weighted.

S/N ratio: 74 dB at 94 dB SPL.

Maximum Sound Pressure Level: 150 dB SPL at the

microphone produces 3% THD.

Polarity: Positive pressure on the diaphragm pro- duces positive voltage on pin 2 with respect to pin 3 of the output connector.

Operating voltage: Phantom power, 12-48 volts DC, positive voltage on pins 2 and 3 with respect to pin 1 of the output connector.

Current drain: 1.1 mA.

Cable: Permanently attached 15-foot (4.58-m) black cable with an XLRM connector.

Switch: Frequency-response select switch for rising or flat response.

Color: Black.

Dimensions: 3-in. x 2.5-in. x .375-in. (7.62-cm x 6.35-cm x .95-cm). See Fig. 2.

Included accessories: PZM windscreen, carrying

pouch.

Optional accessories: PH-4B phantom power supply (4 channels, AC powered). PH-1A phantom power supply (1 channel, battery or AC-adapter pow- ered).

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

Fig. 1

+15
+10			RISING
+5
dB 0			FLAT
–5
–10
–15
–20
–25
–30
–35	100	1K	10K
20

Frequency in Hz

Legend –––––––––– RISING

- - - - - - - - - FLAT

Low frequency response depends on size of surface.

Fig. 2

3in.

(7.62 cm)

2.5 in.

(6.35 cm)

.375 in.

(0.95 cm)

2.5 in.

(6.35 cm)

3.8 in.

(9.65 cm)

.750 in.

(1.91 cm)

plug the microphone into a phantom power sup- ply. Connect the power supply output to a

FLAT RISING

DIA.