Audio Technica UniPoint AT853PMWx Product Information

Description
The AT853PMx is a wide-range miniature
condenser microphone with a cardioid (unidi-
rectional) polar pattern. It has been designed
for use in high-quality sound reinforcement,
professional recording, television, and other
demanding sound pickup applications. The
AT853PMx is furnished with a vinyl-coated
steel hanger that allows it to be positioned
inconspicuously over a choir, orchestra,
stage, etc., for very low-profile situations.
Supplied as a cardioid, the AT853PMx easily
accepts interchangeable elements to permit
selection of angle of acceptance from 100° to
360°. The following optional elements are
available from an authorized Audio-Technica
dealer or the A-T service department:
AT853H-ELE hypercardioid, AT853O-ELE
omnidirectional, AT853SC-ELE subcardioid.
The AT853PMx features a 25' (7.6 m) perma-
nently-attached miniature cable that may be
cut to any length and connected to screw
terminals on the AT8534(A) wall/ceiling plate
power module provided. The power module
features a white-finished standard electrical
cover plate for easy, secure installation.
Output is low impedance balanced via screw
terminals. The AT853PMx requires power
from an external 9V to 52V DC phantom
power supply.
The microphone element is enclosed in a
rugged housing with a low-reflectance black
finish. The microphone is also available in
white as the AT853PMWx, with a white-
finished microphone housing, windscreen,
cable and steel hanger, for applications
where the microphone must be hung against
a light background.
Installation and Operation
The combination of small size and excellent
response makes the AT853PMx ideal for
suspension over choirs, instrumental groups
or theater stages. A uniform 120° angle of
acceptance provides well-balanced audio
pickup. The microphone should be located
forward of the front-most source, above the
rear-most source, and "aimed" between
them (Fig. 1). Increasing the height of the mic
above the sources will tend to equalize sound
levels between them, but may also increase
background/reverberant sound pickup.
Whenever possible, the distance from the mic
to the rear-most pickup should be no more
than twice the distance to the front source, to
maintain front-to-rear balance (Fig. 1).
Width of pickup is approximately three times
the distance to the closest performer. If addi-
tional mics are needed for wide sources,
they should not be closer together laterally
than three times the distance to the front
source, to avoid phase cancellation (Fig. 2).
To orient in the proper direction, twist the
microphone housing slightly in its wire holder
(clockwise rotation moves the microphone to
the right; counterclockwise rotation moves
it to the left). The foam windscreen slips over
the head of the microphone, effectively reduc-
ing noise from wind or ventilation air currents.
AT853PMx
AT853PMWx
CARDIOID
CONDENSER
MICROPHONES
WITH
WALL/CEILING
PLATE POWER
MODULE
The AT8534(A) wall/ceiling plate power mod-
ule is designed to be mounted in a standard
single-gang electrical box. For safety and best
performance, use the electrical box only for
the AT8534(A); do not include any AC power
conductors. (Also route the mic cable as far
away from AC power cables as possible.)
Feed the small cable from the mic through
the strain relief on the power module plate.
Tie a loose knot in the cable at the desired
length and push it down gently into the
recess in the back of the strain relief to
secure the microphone. Cut excess cable,
strip the mic cable wires and attach them to
their respective input terminals (Fig. 3 on the
back of this sheet). Screw-terminal output
connections of the AT8534(A) are the same
as those of an XLR-type plug: shield to
Terminal 1, balanced signal and phantom
power to Terminals 2 and 3. Output is phased
so that positive acoustic pressure produces
positive voltage at Terminal 2, in accordance
with industry convention. Do not connect the
output cable shield to the box. Double-check
120
120
ANGLE OF
ACCEPTANCE
MIC A
DISTANCE "X"
Figure 1. Vertical positioning. Figure 2. Horizontal spacing.
to make certain that all input and output
leads have no bare wires or loose strands
that could touch each other, the circuit board
or the electrical box. Then attach the power
module plate to the electrical box.
The AT853PMx offers a low-roll-off filter. As
supplied, the AT8534(A) power module is
wired for flat response. To enable the low-roll-
off filter, clip the jumper wire "JW" (Fig. 3)
on the circuit board of the AT8534(A). Low
roll-off is useful in reducing room rumble,
low-frequency air movement noise, and low-
frequency vibration.
While a modern condenser microphone
is not unduly sensitive to the environment,
temperature extremes can be harmful. Avoid
leaving the microphone in the open sun or in
areas where temperatures exceed 110° F
(43° C) for long periods of time. Extremely
high humidity should also be avoided.
Architects and Engineers Specifications
The microphone shall be a fixed-charge
condenser with a cardioid polar pattern and
a frequency response of 30 Hz to 20,000 Hz.
It shall be capable of accepting optional inter-
changeable elements for additional polar pat-
terns. It shall operate from an external 9V to
52V DC phantom power source. Nominal
open-circuit output shall be 22.4 mV at 1 kHz,
1 Pascal. Output with the wall/ceiling plate
power module shall be low impedance bal-
anced (200 ohms).
The microphone shall have a permanently-
attached 25' (7.6 m) miniature cable with a
pigtail output. The pigtail output shall connect
to screw terminals on the power module.
Output connections on the power module
shall be screw terminals.
The microphone shall be mountable in an
included steel hanger that allows permanent
overhead installation for pickup of dialogue,
orchestras, choirs, and other large groups.
The microphone shall be 1.39" (35.2 mm)
long with a head diameter of 0.47" (12.0
mm). The microphone weight shall be 0.4 oz.
(10 grams) without cable. The microphone
case, cable and steel hanger shall be black
[white].
The Audio-Technica AT853PMx [AT853PMWx.]
is specified.
Frequency Response
50 100 200
12" or more on axis (flat)
LEGEND
Roll-off
120
MIC B
3 TIMES
10 dB
500 1k 2k 5k 10k 20k
Frequency in Hertz