AUDIO TECHNICA ES931WML ES931MLMIC_ENG_L0008_V1.0.pdf

ES931ML/MIC & ES931WML/MIC

MicroLine® Condenser Gooseneck Microphones

Features

• MicroLine® polar pattern provides narrow 90° acceptance
angle.

• Low-profile design with low-reflectance finish for minimum
visibility.

• Superior off-axis rejection for maximum gain before feedback.

• UniGuard® RFI-shielding technology offers outstanding
rejection of radio frequency interference (RFI).

• 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 (ES931ML/MIC)
and white (ES931WML/MIC).

Description

The ES931ML / MIC is a wide-range miniature condenser

microphone with a MicroLine® (line cardioid) polar pat tern.
It is designed for quality sound reinforcement. The small
diameter gooseneck design permits highly flexible 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 a compatible Audio-Technica power

module (not included) for operation.
The microphone is equipped with UniGuard® RFI-shielding

technology, which offers outstanding rejection of radio frequency

interference (RFI).
The microphone’s MicroLine® (line cardioid) polar pat tern
provides a 90° angle of acceptance. Additional interchangeable
elements with omnidirectional (360°) , cardioid (120°) and

hypercardioid (100°) pickup patterns are available.
The microphone’s free end connects to a compatible Audio­Technica power module (not included) via a special TA3F-t ype
connector designed to optimize RFI immunity.

The microphone is enclosed in a rugged housing with a low­reflectance black finish and comes equipped with a two-stage

foam windscreen. It is also available with white housing and
windscreen as the ES931WML/MIC.

Installation and Operation

The ES931ML / MIC requires a compatible Audio-Technica power

module (not included) 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, ef fectively reducing noise from wind or

ventilation air currents.

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 par t of the connectors in the
Engineered Sound® line. If you remove or replace the connector,

you may adversely affect the unit’s RFI immunity.

Architect’s and Engineer’s Specifications

The microphone shall be a fixed-charge condenser designed for
permanent installation or portable applications. It shall have a

MicroLine® (line cardioid) polar pat tern with a uniform 90° angle

of acceptance and a frequency response of 30 Hz to 20,000 Hz. It
shall be capable of accepting optional interchangeable elements

for additional polar patterns. The microphone shall operate
from an Audio-Technica power module (not included). It shall be

capable of handling sound input levels up to 13 3 dB with a dynamic
range of 10 9 dB. Nominal open-circuit output voltage shall be

17.7 mV at 1V, 1 Pascal. It shall of fer outstanding rejection of radio
frequency interference (RFI).

MIC B

°

90

°

90

MIC A

1. 5 TIMES

DISTANCE “X”

Figure 1

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L00008_V1.0

ES931ML/MIC & ES931WML/MIC

MicroLine® Condenser Gooseneck Microphones

The microphone shall incorporate a special TA3F-t ype output
connector designed to optimize RFI immunity.

A two-stage foam windscreen shall be included.
The microphone shall be a small-diameter gooseneck design,

with an overall length of 2 71.4 mm and a head diameter of 8.0 mm.
Weight shall be 43 grams. The microphone shall be black (white) .

The Audio-Technica ES931ML /MIC (ES931WML/MIC) is specified.

Specifications

Element Fixed-charge back plate,

permanently polarized condenser

Polar pattern MicroLine® (line cardioid)

Frequency response 30-20,00 0 Hz

Open circuit sensitivit y –3 5 dB (17.7 mV ) re 1V at 1 Pa

Maximum input sound level 133 dB SPL , 1 kHz at 1% T.H.D.

Dynamic range (t ypical) 109 dB, 1 kHz at Max SPL

Signal-to-noise ratio1 70 dB, 1 kHz at 1 Pa

Weight 43 g

Dimensions 271. 4 mm long, 8.0 mm head diameter,

11.6 mm base diameter

Output connector TA3F-type

Optional interchangeable ESE-O omnidirectional (360°)
elements ESE-C cardioid (120°)
ESE-H hypercardioid (100° )

Audio -Technica case s tyle M42

Accessories furnished

ES931ML/MIC AT8138 t wo-stage foam windscreen
ES931WML/MIC AT8138 (WH) two-s tage foam windscreen

Compatible power modules AT85 34 wall /ceiling plate power module;

AT85 38 power module; ATND8 73 4 network

Specifications are subject to change without notice.

1

Typical, A-weighted, using Audio Precision System One.

audio microphone power module

0.31"

8.0 mm

5.17"

131.3 mm

10.7"

271.4 mm

0.24"

6.0 mm

0.46"

11.6 mm

frequency response: 30–20,000 Hz

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L00008_V1.0

50

100

LEGEND

polar pattern

330˚

300˚

270˚

240˚

210˚

SCALE IS 5 DECIBELS PER DIVISION

500

200

Frequency in Hertz

12" or more on axis

0˚

30˚

150˚

180˚

1k

60˚

120˚

90˚

2k

LEGEND

200 Hz

1 kHz
5 kHz
8 kHz

10 dB

Response in dB

5k

10k

20k