Crown Audio PZM-20RW dimensions Suggestions For Use, Features, Specifications

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POLAR

PATTERN

PRESSURE

ZONE

®MICROPHONE

PZM-20R

PZM-20RW

he Crown® PZM-20R is a Pressure TZone Microphone® designed for per

manent flush-mounting in tables, lecterns, pulpits, and judicial benches. Its unobtrusive appearance and hemispherical pickup pattern make it ideal for conference table use. The microphone fits into a 4.59-in. (11.659-cm) square hole or in a standard

4.0-in. x 4.0-in. (10.16-cm x 10.16-cm) elec- trical outlet box.

Electronics in the base of the 20R adapt the microphone for phantom powering. No ex- ternal power-supply interface is required. The

Features

For permanent flush-mounting in tables

Hemispherical polar pattern picks up every- one around the microphone

Frequency response tailored for speech clarity

Low-frequency rolloff reduces air-handling noise

Screw terminals provide low-cost connec- tions

microphone plugs directly into a phantom power supply providing 12 to 48 volts.

The wide-range frequency response of the 20R is emphasized at high frequencies for clarity and articulation. Low frequencies be- low the voice range are filtered out to reduce rumble.

Three small guard-posts prevent papers from sliding underneath the cantilever arm and altering the frequency response.

Like other Pressure Zone Microphones, the 20R utilizes the Pressure Recording Process™ in which a miniature condenser microphone capsule 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.

Suggestions For Use

The PZM-20R differs from other PZMs in that it is a stationary microphone, generally not moved from one location to another. Before installing it, first check that the pickup will be adequate by testing a regular PZM placed where you plan to install the 20R.

Specifications

Type: Pressure Zone Microphone.

Element: Electret condenser.

Frequency response (typical): 80 Hz to 20 kHz (see

Fig. 1).

Polar pattern: Hemispherical on an infinite plane.

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.

Equivalent noise level: 20 dB SPL (0 dB = 0.0002 dyne/cm2), A-weighted.

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

Maximum SPL: 150 dB SPL at the microphone pro- duces 3% THD.

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

Operating voltage: Phantom power, 12 to 48 volts DC, positive voltage on terminals 2 and 3 with re- spect to terminal 1 of the output terminal strip.

Current drain: 1.1 mA.

Color: Black.

Connector: Screw terminals. #1 shield, #2 audio in- polarity, #3 audio return.

Cable: None supplied; use 2-conductor shielded mi- crophone cable.

Weight: 8.1 ounces (230 grams).

Dimensions: See Figs. 2A and 2B.

Optional accessories: Crown PH-1A phantom power supply (single channel, battery or AC adapter powered).

Fig. 1

Frequency Response

+15

+10

+5

dB 0 –5

–10

–15

–20

–25

–30

–35

20

100

1K

10K

 

 

Frequency in Hz

 

Low frequency response depends on size of surface.

Fig. 2A

.250 in.

.635 cm

.187 in.

.475 cm

1.1 in.

2.695 cm

4.58in.

11.63 cm

3.42 in.

4.58 in.

8.69 cm

11.63 cm

Avoid areas where items might be placed on top of the microphone. Once you’ve decided on the microphone position, rout a recessed hole according to the dimensions in Fig. 2B on the reverse side.

*1 pascal = 10 dynes/cm2

= 10 microbars = 94 dB SPL.

3.42 in.

8.69 cm

 

 

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Contents Suggestions For Use FeaturesSpecifications Service WarrantyOperating Instructions Architects’ and Engineers’ Specifications

PZM-20RW, PZM-20R specifications

Crown Audio is renowned for its innovative sound reinforcement products, and the PZM-20R and PZM-20RW are no exception. These Boundary Microphones, part of the Pressure Zone Microphone (PZM) series, are designed to capture sound with exceptional clarity and detail, making them ideal for a range of professional audio applications.

One of the standout features of the PZM-20R and PZM-20RW is their unique PZM technology. This design utilizes a thin, high-quality condenser element mounted on a flat surface, allowing for the capture of sound waves that reflect off nearby surfaces. This feature significantly increases sensitivity and enhances the microphone's ability to pick up sound without the coloration that often accompanies traditional microphone designs. This results in a natural and open sound that is particularly effective in environments where ambient noise can be a challenge.

The PZM-20R is engineered for indoor use while the PZM-20RW version offers weather-resistant properties, making it suitable for outdoor applications. The PZM-20RW is ideal for locations where moisture and environmental factors can affect performance, such as outdoor events, conferences, or theater performances. Both models come with a rugged construction, ensuring durability and longevity in a variety of settings.

A key characteristic of the PZM-20R and PZM-20RW is their ability to provide exceptional off-axis rejection. This feature minimizes the pickup of unwanted sounds that may originate from the sides or rear of the microphones, focusing instead on the intended sound source. This is particularly beneficial in crowded or noisy environments and makes these microphones a preferred choice for recording conferences, lectures, and performances.

Both microphones offer a frequency response that captures a wide range of sound, making them versatile for various applications, including broadcast, film, and live sound reinforcement. Additionally, their low self-noise level ensures that even the most subtle audio nuances are captured without interference.

In summary, the Crown Audio PZM-20R and PZM-20RW boundary microphones combine advanced PZM technology with robust construction to deliver high-fidelity audio reproduction. Their adaptability to both indoor and outdoor environments, along with their excellent sound capturing capabilities, makes them an invaluable addition to any professional audio toolkit. Whether for installations or live performances, these microphones provide reliability and exceptional audio quality.