Crown PZM-11LL - Manual

POLAR
PATTERN

Specifi cations

Type:

Pressure Zone Microphone.

Element:

Electret condenser.

Frequency response (typical):

80 Hz to 20,000 Hz.

See Fig. 1.

Polar pattern:

Hemispherical.

Impedance:

PZM-11: 225 ohms, balanced.
PZM-11LL: 75 ohms, balanced.
Recommended minimum load impedance 1000
ohms.

Open circuit sensitivity:

PZM-11: 5 mV/Pa* (–46 dBV/Pa).
PZM-11LL: 1.4V/Pa* (+3 dB re 1V/Pa).

Power sensitivity:

PZM-11: –45.5 dBm/Pa*
PZM-11LL: +8 dBm/Pa*.

Equivalent noise level (self-noise):

26 dB SPL typi-

cal (0 dB = .0002 dyne/cm

2

), A-weighted.

S/N Ratio:

68 dB at 94 dB SPL.

Maximum SPL:

PZM-11: 120 dB SPL produces 3% THD.
PZM-11LL: 100 dB SPL produces 3% THD.

Output connector:

Three screw terminals.

1 = ground, 2 = audio hot (in polarity),
3 = audio cold (opposite polarity).

Polarity:

Positive pressure on the diaphragm pro-

duces a positive voltage on screw terminal 2 with
respect to screw terminal 3

.

Operating voltage:

PZM-11: Standard phantom power, 12 to 48V DC
on screw terminals 2 and 3 with respect to screw
terminal 1.
PZM-11LL: 24V AC, 12-24V DC, or phantom
power as the PZM-11LLS2.

Current drain:

PZM-11: 400 microamperes.
PZM-11LL: 4 milliamperes.

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).

PRESSURE ZONE
MICROPHONES

Fig. 1.

Frequency Response

Fig. 2.

Dimensions

T

he 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 phan-
tom 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 Re-
cording 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 con-
sistent 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-fre-
quency response is boosted slightly to aid clarity
and articulation.

The microphone connector is a row of screw termi-
nals for easy installation. The output is balanced,
low impedance, which allows long cable runs
without hum pickup or high-frequency loss.

Installation

1. Please refer to Fig. 3 (PZM-11) or Fig. 4 (PZM-
11LL) and locate all the parts shown.

2. Run a 2-conductor shielded mic cable to the
hole where you intend to install the microphone.
Install a standard electrical outlet box in the hole.

To use phantom power, you need a mixer with
phantom power or an external phantom-power
supply. Crown makes a PH-1A phantom power
supply which has 1 channel and is AC-adapter
powered.

(Continued on back)

*1 pascal = 10 dynes/cm

2

= 10 microbars = 94 dB SPL.

Frequency in Hz

PZM

®

-11

PZM-11LL

Net weight:

2.5 oz. (71 g).

Dimensions:

See Fig. 2.

Optional accessories:

Crown PH-1A phantom power

supply (1 channel, AC-adapter powered).

Features

• Ideal for security, surveillance and confer-

rence rooms

• Clear, articulate sound

• Low-impedance screw-terminal output

• Inconspicuous

• PZM-11 is mic level; PZM-11LL is line level

20

25

30

35

20

100

1K

+15

+10

+5

dB 0

5

10

15

10K