Audio-Technica ES931PMML Specifications
ES931PMML & ES931PMWML
MicroLine® Condenser Gooseneck Microphones
Features
• Wall/ceiling plate power module permits permanent installation in
standard, single-gang electrical box
• MicroLine
• 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 (ES931PMML) and white (ES931PMWML)
Description
The ES931PMML is a wide-range miniature condenser microphone with
a MicroLine
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
offers outstanding rejection of radio frequency interference (RFI).
The microphone’s MicroLine® (line cardioid) polar pattern provides a 90° angle
of acceptance. Additional interchangeable elements with omnidirectional
(360°), cardioid (120°) and hypercardioid (100°) pickup patterns are available.
®
polar pattern provides narrow 90° acceptance angle
®
RFI-shielding technology offers outstanding rejection of
®
lter provides a steep low-frequency attenuation to
®
(line cardioid) polar pattern. It is designed for quality sound
®
RFI-shielding technology, which
engineered sound® microphones
Installation and Operation
The ES931PMML requires 11V to 52V phantom power for operation.
A uniform 90° 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 1.5 times the distance to the closest source.
If additional mics are needed for wide sources, they should be positioned
apart laterally at least 1.5 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.
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.
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 roll-off (via integral
80 Hz high-pass UniSteep
®
lter) to help control undesired ambient noise.
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 twostage foam windscreen. The microphone is also available with white housing
and windscreen as the ES931PMWML.
RED/
RED
YEL / YEL
SHIELD
INPUT
MIC B
°
90
°
90
MIC A
1. 5 TIMES
DISTANCE “X”
Figure 1 Figure 2
v+
SIG
GND
Terminal screws
3
2
1
AUDIO AUDIO +
SHIELD
OUTPUT
ES931PMML & ES931PMWML
8 kHz
SCALE IS 5 DECIBELS PER DIVISION
270˚
LEGEND
Response in dB
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0.31"
8.0 mm
5.17"
131.3 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
ES931PMML
ES931PMWML
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
MicroLine® (line cardioid)
30-20,000 Hz
80 Hz, 18 dB/octave
–35 dB (17.7 mV) re 1V at 1 Pa
200 ohms
123 dB SPL, 1 kHz at 1% T.H.D.
102 dB, 1 kHz at Max SPL
1
73 dB, 1 kHz at 1 Pa
11-52V DC, 4 mA typical
Flat, roll-off; 0 dB, +10 dB gain setting
Microphone: 43 g (1.5 oz)
Power module: 97 g (3.4 oz)
Microphone: 271.4 mm (10.7") long,
8.0 mm (0.31") 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-C cardioid (120°)
ESE-H hypercardioid (100°)
M42
AT8534 wall/ceiling plate power module;
AT8138 two-stage foam windscreen
AT8534 wall/ceiling plate power module;
AT8138(WH) two-stage foam
0.24"
6.0 mm
0.46"
11.6 mm
10.7"
271.4 mm
frequency response: 30–20,000 Hz
10 dB
50
100
polar pattern
330˚
300˚
240˚
210˚
Audio-Technica Corporation
audio-technica.com ©2016 Audio-Technica P52597-01
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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