Audio-Technica ES931PMC Specifications
ES931PMC & ES931PMWC
AM
DISTANCE “X”
Cardioid Condenser Gooseneck Microphones
Features
• Wall/ceiling plate power module permits permanent installation in
standard, single-gang electrical box
• Uniform cardioid polar pattern with 120° acceptance angle
• Low-prole design with low-reectance nish for minimum
visibility
• Superior off-axis rejection for maximum gain before feedback
• UniGuard
radio frequency interference (RFI)
• UniSteep
minimize pickup of undesired ambient noise
• Easy-to-adjust, rugged, small-diameter gooseneck with virtually no
“memory” permits quick positioning into desired shape
• Available interchangeable elements permit angle of acceptance
from 90° to 360°
• Ideal for boardrooms, school and government settings,
teleconferencing, houses of worship and other installed
applications
• Available in two colors: black (ES931PMC) and white
(ES931PMWC)
Description
The ES931PMC is a wide-range miniature condenser microphone with
a cardioid polar pattern. It is designed for quality sound reinforcement.
The small-diameter gooseneck design permits highly exible positioning
while maintaining a smooth, well-contoured appearance. The combination
of small size and excellent response makes the microphone ideal for
boardrooms, school and government settings, teleconferencing, houses
of worship and other installed applications.
The microphone requires 11V to 52V phantom power for operation.
The microphone is equipped with UniGuard
which offers outstanding rejection of radio frequency interference (RFI).
The microphone’s cardioid polar pattern provides a 120° angle of acceptance.
Additional interchangeable elements with omnidirectional (360°),
hypercardioid (100°) and MicroLine
®
RFI-shielding technology offers outstanding rejection of
®
lter provides a steep low-frequency attenuation to
®
RFI-shielding technology,
®
(90°) pickup patterns are available.
engineered sound® microphones
The microphone is enclosed in a rugged housing with a low-reectance
black nish and comes equipped with a wall/ceiling plate power module
and a two-stage foam windscreen. The microphone is also available with
white housing and windscreen as the ES931PMWC.
Installation and Operation
The ES931PMC requires 11V to 52V phantom power for operation.
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. 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. When possible, the distance from the mic to the rear-most
source should be no more than twice the distance to the front source, to
maintain front-to-rear balance.
Width of pickup is approximately three times the distance to the closest
source. If additional mics are needed for wide sources, they should be
positioned apart laterally at least three times the distance to the front
source, to avoid phase cancellation (Fig. 1).
The provided two-stage foam windscreen simply snaps over the head of
the microphone, effectively reducing noise from wind or ventilation air
currents.
An integral 80 Hz high-pass UniSteep
®
lter provides easy switching from
a at frequency response to a low-end roll-off. The roll-off position reduces
the pickup of low-frequency ambient noise (such as trafc, air-handling
systems, etc.), room reverberation and mechanically coupled vibrations.
To engage the UniSteep
®
lter, slide the switch toward the “bent” line. A
10 dB gain switch is provided for situations that demand extra sensitive
pickup. The +10 position increases the microphone’s overall output by 10
dB. To engage the 10 dB gain, slide the switch toward the +10 position.
The AT8534 wall/ceiling plate power module is designed to be mounted
in a standard metal U.S. single-gang electrical box. For safety and best
performance, use the electrical box only for the AT8534; do not include
any AC power conductors. (Also route the mic cable as far away from AC
power cables as possible.)
Screw-terminal output connections of the AT8534 are the same as those
of an XLR-type plug: shield to Terminal 1, balanced signal and phantom
power to Terminals 2 and 3 (Fig. 2). 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 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.
Connect the TA3F-type connector on the microphone to the TB3M-type
connector in the power module plate.
Avoid leaving the microphone in the open sun or in areas where
temperatures exceed 110° F (43° C) for extended periods. Extremely high
humidity should also be avoided.
The microphone’s free end connects to the provided AT8534 wall/
ceiling plate power module via a special TA3F-type connector designed
to optimize RFI immunity. The power module features a white-nished
standard electrical cover plate for easy, secure installation. Output
connections on the power module are screw terminals.
Switches in the power module permit a +10 dB gain setting for extra
sensitive pickup as well as a choice of at response or low-frequency rolloff (via integral 80 Hz high-pass UniSteep
®
lter) to help control undesired
ambient noise.
RED/
RED
YEL / YEL
SHIELD
INPUT
MIC
3 TIMES
120°120°
IC B
Figure 1 Figure 2
v+
SIG
GND
Terminal screws
3
2
1
AUDIO AUDIO +
SHIELD
OUTPUT
ES931PMC & ES931PMWC
8 kHz
270˚
LEGEND
Response in dB
Note: Audio-Technica has developed a special RFI-shielding mechanism,
which is an integral part of the connectors in the Engineered Sound® line.
If you remove or replace the connector, you may adversely affect the
unit’s RFI immunity.
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0.33"
8.4 mm
Specications
Element
Polar pattern
Frequency response
Low frequency roll-off
Open circuit sensitivity
Impedance
Maximum input sound level
Dynamic range (typical)
Signal-to-noise ratio
Phantom power requirements
Switches
Dimensions
Output connector
Optional interchangeable elements
Audio-Technica case style
Accessories furnished
ES931PMC
ES931PMWC
In the interest of standards development, A.T.U.S. offers full
details on its test methods to other industry
1 Pascal = 10 dynes/cm
1
Typical, A-weighted, using Audio Precision System One.
Specications are subject to change without notice.
professionals on request.
2
= 10 microbars = 94 dB SPL
Weight
Fixed-charge back plate, permanently
polarized condenser
Cardioid
30-20,000 Hz
80 Hz, 18 dB/octave
–40 dB (10.0 mV) re 1V at 1 Pa
200 ohms
128 dB SPL, 1 kHz at 1% T.H.D.
102 dB, 1 kHz at Max SPL
1
68 dB, 1 kHz at 1 Pa
11-52V DC, 4 mA typical
Flat, roll-off; 0 dB, +10 dB gain setting
Microphone: 39 g (1.4 oz)
Power module: 97 g (3.4 oz)
Microphone: 152.4 mm (6.0") long (with
capsule), 8.4 mm (0.33") head diameter,
11.6 mm (0.46") base diameter
Power module: 71.0 mm (2.80") W x
115.5 mm (4.55") H x 36.0 mm (1.42") D
Power module: Screw-terminals
ESE-O omnidirectional (360°)
ESE-H hypercardioid (100°)
ESE-ML MicroLine® (90°)
M41
AT8534 wall/ceiling plate power module;
AT8109 two-stage foam windscreen
AT8534 wall/ceiling plate power module;
AT8109(WH) two-stage foam
0.24"
6.0 mm
0.46"
11.6 mm
6.0"
152.4 mm
frequency response: 30–20,000 Hz
10 dB
50
100
polar pattern
330˚
300˚
240˚
210˚
SCALE IS 5 DECIBELS PER DIVISION
Audio-Technica Corporation
audio-technica.com ©2016 Audio-Technica P52595
500
200
Frequency in Hertz
12" or more on axis
Roll-off
0˚
30˚
150˚
180˚
1k
60˚
120˚
90˚
2k
LEGEND
200 Hz
1 kHz
5 kHz
5k
10k
20k
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