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Crown Audio PZM-20R Pressure Zone Flush-Mount Microphone



Crown Audio PZM-20R Pressure Zone Flush-Mount Microphone


 

Our Price : $369.51


Product Code: 505354

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Description
 
The Crown® PZM-20R is a Pressure Zone Microphone® designed for permanent 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) electrical outlet box.

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

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. 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.

Features
• For permanent flush-mounting in tables
• Hemispherical polar pattern picks up everyone around the microphone
• Frequency response tailored for speech clarity
• Low-frequency rolloff reduces air-handling noise
• Screw terminals provide low-cost connections

Specifications
  • Type: Pressure Zone Microphone.
  • Element: Electret condenser.
  • Frequency response (typical): 80 Hz to 20 kHz
  • 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 sensitivity –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 produces 3% THD.
  • Polarity: Positive pressure on the diaphragm produces 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 respect to terminal 1 of the output terminal strip.
  • Current drain: 1.1 mA.
  • Color: Black.

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