Crown PZM11 AKG Pressure Zone Pro Microphone Security & Surveilence

The Crown® PZM®-11 or PZM-11LL is a

Pressure Zone Microphone® designed for

conference-room, security and surveillance

applications. Each can be mounted in the ceiling or

wall in a standard electrical outlet box. Providing

excellent intelligibility, the PZM-11 and

PZM-11LL are designed to look like a light switch

so as not to draw attention.

The PZM-11 has a mic-level output and is powered

by 12-48V phantom power.

The PZM-11LL has a line-level output and can be

powered by 24V AC, 12-24V DC, or 12-48V phantom

power. Since the PZM-11LL has a high output,

it can be plugged directly into a VCR line input—no

costly mic preamp is needed.

To phantom power the PZM-11LL, a modifi cation

will have to be made to the electronics module (see

Installation Step 3 for details).

Like other Pressure Zone Microphones, the

PZM-11and PZM-11LL utilize the Pressure Recording

Process™ in which a miniature condenser

microphone capsule is mounted very close to a

sound-refl ecting 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 refl ected off the boundary. The benefi ts are

a wide, smooth frequency response free of phase

interference, excellent clarity and “reach,” and consistent

pickup anywhere around the microphone.

In the PZM-11and PZM-11LL, low frequencies

below the voice range are rolled off to reduce

pickup of air-conditioning rumble. The high-frequency

response is boosted slightly to aid clarity

and articulation.

The microphone connector is a row of screw terminals

for easy installation. The output is balanced,

low impedance, which allows long cable runs

without hum pickup or high-frequency loss.

Type: Pressure Zone Microphone.

Element: Electret condenser.

Frequency response (typical): 80 Hz to 20,000 Hz.

See Fig. 1.

Polar pattern: Hemispherical.

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.

Output connector: Three screw terminals.

1 = ground, 2 = audio hot (in polarity),

3 = audio cold (opposite polarity).

Polarity: Positive pressure on the diaphragm produces

a positive voltage on screw terminal 2 with

respect to screw terminal 3.

Operating voltage:

Materials: Steel plate and high-impact plastic

capsule holder.

Finish: Off-white. May be painted any color; take

care to fi rst seal the opening between the mic

capsule and boundary plate.

Operating Temperature Range: –10° to +60° C

(+14° to +140° F).