Omnicron electronics PZ-2LA User guide

Pressure Zone room monitoring Microphone

PZ-2LA

DESCRIPTION

The Omnicron PZ-2LA Pressure Zone
Microphone® is designed for meeting and
conference recording. So that it does not
draw attention, it looks like a switch, not a
microphone. It has its own power supply and
can be used with recorders which do not pr o­vide power for external microphones.
Like other Pressure Zone Microphones,
the PZ-2LA uses a miniature mic capsule
mounted near a sound reflecting plate. In
this zone, direct sound from the source
combines in phase at all frequencies with
reflected sound. The benefits are many: 6 dB
more sensitivity, 6 dB less noise, a wide
smooth frequency response free of phase
interference, excellent clarity, and consistent
pickup anywhere around the microphone.
A built-in amplifier provides a high
level output. Power for the amplifier is pro­vided by an AC power adapter which is sup­plied with the PZ-2LA microphone. The
high level output permits longer cable runs
than possible with a standard microphone.

INSTALLATION

The PZ-2LA comes pre-wired for use
with recorders that have a 3.5mm “AUX”
(auxiliary) input jack. It is supplied with a 6'
cable that plugs into a supplied junction box.
The junction box has an AC adapter
which plugs into 120VAC to power the unit,
and a 6' cable to connect audio output from
the microphone to your recorder. Follow the
directions supplied with your recorder for
recording with the PZ-2LA microphone.
If the microphone is located more than
12' from your recorder, standard RJ-11 tele-
phone extension cables can be used. One
twenty five foot (25') extension cable is
supplied with each PZ-2LA microphone.

1K

with line level output and AC power adapter.

NOTES

The PZ-2LA can also be powered by
an external AC or DC source between 8
and 24 volts. Connect it to the electronics
circuit board at INPUT screw terminals
# 1 and # 2. A balanced audio output is
available at OUTPUT screw terminals
# 2 and # 3. The recommended minimum
load impedance is 1000 ohms.
If the microphone is mounted to a
grounded enclosure, ground loops could

CUSTOM INSTALLATION

After removing the plastic housing, the
microphone can be installed in a ceiling or
wall using a standard electrical outlet box.

Internal connections to the PZ-2LA elec­tronics are as follows:

1. Power from the 12VDC AC power
adapter connects to INPUT terminals
# 1 & # 2.

2. Audio output connections are made at
OUTPUT terminals # 2 and # 3.

3. If the audio output is connected to
equipment that has a balanced input
circuit with a separate ground
connection, the ground connects
to OUTPUT terminal # 1.

PZ-2LA Circuit board layout (top)

occur that would cause hum. If hum is pre­sent when the PZ-2LA housing is con­nected to ground, remove the resistor
labeled GND LIFT on the printed circuit
board (see schematic below).
The microphone is factory set to han­dle sound levels up to 110 dB without ex­cessive distortion. If the sound at the mic
will exceed 110 dB, increase the value of
the plug-in resistor (labeled Gain) for more
headroom. To increase the gain, replacing
the 1K ohm resistor with a 390 ohm resis­tor will provide 12 dB more gain with a
corresponding decrease in headroom.

MICROPHONE SPECIFICATIONS

Element: Pressure Zone Electret Con­denser l Frequency Response: 80-20,000
Hz l S/N Ratio: 68 dB l Polar Pattern:
Hemispherical l Impedance: 75 ohms l
Output Level: 1.4 V/Pa (+3 dB re 1 V/Pa)

l Maximum SPL: 100 dB 3% THD l

Equivalent Noise Level: Less than 26 dB,

A weighted l Power: supplied by an exter­nal 120VAC to 12VDC adapter, or 8-24
VAC/DC, 4 ma l Dimensions: 2" x 3" x
4¾" l Net Weight: 6 oz without cable

l Color: Microphone and Cable are Ivory
l Warranty: Limited 1 year parts & labor.

SERVICE

If the unit fails to work, recheck all
your connections as described in the In­stallation Section. Assistance is also avail­able from your place of purchase or from
Omnicron. If service is required, return it
to Omnicron at the address shown below.
Please refer to the warranty statement for
warranty details.

PZM® and Pressure Zone Microphone® are
registered trademarks of Crown International,
Inc. The PZM® microphone used in the PZ-2LA
is manufactured by Crown International, Inc.

PZ-2LA Schematic diagram

CC

581 Liberty Highway ll P.O. Box 623 ll Putnam, CT 06260-0623 ll (([phone] ll FAX [phone]

OMNICRON ELECTRONICS www.omnicronelectronics.com

02020098