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ES931H/MIC & ES931WH/MIC
Hypercardioid Condenser Gooseneck Microphones
Installation and Operation
The ES931H/MIC requires a compatible Audio-Technica power module (not included)
for operation.
A uniform 100° 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 2.5 times the distance to the closest source. If
additional mics are needed for wide sources, they should be positioned apart laterally
at least 2.5 times the distance to the front source, to avoid phase cancellation (Fig. 1).
Engineered Sound® Microphones
Features
• Uniform hypercardioid polar pattern with 100° acceptance angle
• Low-profile design with low-reflectance finish for minimum visibility
• Superior o-axis rejection for maximum gain before feedback
• UniGuard® RFI-shielding technology oers 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 (ES931H/MIC) and white (ES931WH/MIC)
Description
The ES931H/MIC is a wide-range miniature condenser microphone with a
hypercardioid polar pattern. It is designed for quality sound reinforcement. The smalldiameter 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 oers
outstanding rejection of radio frequency interference (RFI).
The microphone’s hypercardioid polar pattern provides a 100° angle of acceptance.
Additional interchangeable elements with omnidirectional (360°), cardioid (120°) and
MicroLine® (90°) pickup patterns are available.
The microphone’s free end connects to a compatible Audio-Technica power module
(not included) via a special TA3F-type connector designed to optimize RFI immunity.
The provided two-stage foam windscreen simply snaps over the head of the
microphone, eectively 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 part of the connectors in the Engineered Sound® line. If you remove or
replace the connector, you may adversely aect 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 hypercardioid polar pattern with
a uniform 100° angle of acceptance and a frequency response of 80 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 138 dB with a
dynamic range of 109 dB. Nominal open-circuit output voltage shall be 10.0 mV at 1V,
1 Pascal. It shall oer outstanding rejection of radio frequency interference (RFI).
The microphone shall incorporate a special TA3F-type 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
(with capsule) of 152.4 mm (6.0") and a head diameter of 8.4 mm (0.33"). Weight
shall be 39 grams (1.4 oz). The microphone shall be black [white].
The Audio-Technica ES931H/MIC [ES931WH/MIC] is specified.
The microphone is enclosed in a rugged housing with a low-reflectance black finish
and comes equipped with a two-stage foam windscreen. It is also available with
white housing and windscreen as the ES931WH/MIC.
Figure 1
100
100
°
MIC A
2.5 TIMES
DISTANCE “X”
°
MIC B
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ES931H/MIC & ES931WH/MIC
8 kHz
SCALE IS 5 DECIBELS PER DIVISION
0.33"
8.4 mm
0.24"
6.0 mm
0.46"
11.6 mm
6.0"
152.4 mm
Specifications
Element
Polar pattern
Frequency response
Open circuit sensitivity
Maximum input sound level
Dynamic range (typical)
Signal-to-noise ratio
Weight
Dimensions
Output connector
Optional interchangeable elements
Audio-Technica case style
Accessories furnished
ES931H/MIC
ES931WH/MIC
Compatible power modules
Specifications derived by using AT8538 power module.
In the interest of standards development, A.T.U.S. oers full details
1 Pascal = 10 dynes/cm
1
Typical, A-weighted, using Audio Precision System One.
on its test methods to other industry
professionals on request.
2
= 10 microbars = 94 dB SPL
Specifications are subject to change without notice.
Fixed-charge back plate, permanently
polarized condenser
Hypercardioid
80-20,000 Hz
–40 dB (10.0 mV) re 1V at 1 Pa
138 dB SPL, 1 kHz at 1% T.H.D.
109 dB, 1 kHz at Max SPL
1
65 dB, 1 kHz at 1 Pa
39 g (1.4 oz)
152.4 mm (6.0") long (with capsule),
8.4 mm (0.33") head diameter, 11.6 mm
(0.46") base diameter
TA3F-type
ESE-O omnidirectional (360°)
ESE-C cardioid (120°)
ESE-ML MicroLine
®
(90°)
M41
AT8109 two-stage foam windscreen
AT8109(WH) two-stage foam windscreen
AT8534 wall/ceiling plate power
module; AT8538 power module;
ATND8734a network audio microphone
power module
frequency response: 80– 20,000 Hz
50
polar pattern
330˚
300˚
240˚
210˚
100
500
200
Frequency in Hertz
12" or more on axis
0˚
30˚
150˚
180˚
1k
60˚
90˚
120˚
Audio-Technica Corporation
www.audio-technica.com
©2018 Audio-Technica 0001-0345-00
2k
LEGEND
200 Hz
1 kHz
5 kHz
10 dB
5k
10k
20k