The Crown ® PZM-10 is a Pressure Zone Microphone designed for security,surveillance,and conference-table use. Since it does not look like a microphone, it is inconspicuous. The mic’s tubular housing mounts in a 25/32-inch diameter hole in a ceiling panel, wall or table.

Like other Pressure Zone Microphones, the PZM-10 uses a miniature mic capsule mounted very near a sound-reflecting plate or boundary, in the Pressure Zone. In this zone, direct sound from the sound source combines in phase at all frequencies with reflected sound off the boundary.

The benefits are many: 6 dB more sensitivity, 6 dB less noise, a wide smooth frequency response free of phase interference, excellent clarity and “reach,” and consistent pickup anywhere around the mic.

In the PZM-10, frequencies below the voice range are rolled off to reduce pickup of air conditioning rumble. The high-frequency response is boosted slightly to help articulation.

Because of its tailored response and PZM construction, the PZM-10 will pick up conversations or other desired sounds with extra clarity and definition. The microphone connector is a 3-pin XLRM type for easy plug-in installation. The output is balanced, low impedance, which allows long cable runs without hum pickup or high-frequency loss. The PZM-10 requires 12 to 48 V phantom power. The mic’s humbucking transformer and steel case prevent hum pickup, even near fluorescent lights.

Installation: To pick up speech from a conference table, mount the PZM-10 in the ceiling over the table or in a wall next to the table.

Specifications:

• Transducer type: Electret condenser
• Frequency response (typical): 80 Hz to 20,000 Hz. See Fig. 1.
• Polar pattern: Hemispherical
• Impedance: 240 ohms, balanced. Recommended
• minimum load impedance 1000 ohms
• Open circuit sensitivity: 2.5 mV/Pa* (–52 dBV/Pa)
• Power sensitivity: –52 dBm/Pa*
• Equivalent noise level (self-noise): 26 dB SPL typical (0 dB = .0002 dyne/cm2), A-weighted
• S/N Ratio: 68 dB at 94 dB SPL
• Maximum SPL: 120 dB SPL produces 3% THD
• Operating voltage: 12 to 48 V phantom power, positive voltage on pins 2 and 3 with respect to pin 1
• Polarity: Positive pressure on the diaphragm produces a positive voltage on pin 2 with respect to pin 3 of output connector
• Current drain: 400 microamperes
• Output connectors: Male XLR type (3-pin pro audio)
• Cable: None supplied. Use 2-conductor shielded mic cable
• Materials: Steel plate and housing
• Finish: Off-white. May be painted any color; take care to first seal the opening between the capsule and boundary plate
• Net weight: 2.6 oz. (73.6 g)

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