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ES931C/MIC & ES931WC/MIC
Cardioid Condenser Gooseneck Microphones
Features
• Uniform cardioid polar pattern with 120° 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 (ES931C/MIC)
and white (ES931WC/MIC).
Description
The ES9 31C/MIC 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 flexible positioning while maintaining a smooth, wellcontoured 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 cardioid polar pattern provides a 120° angle
of acceptance. Additional interchangeable elements with
omnidirectional (360°), hypercardioid (100° ) and MicroLine® (9 0°)
pickup patterns are available.
The microphone’s free end connects to a compatible AudioTechnica power module (not included) via a special TA3F-type
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 ES931WC /MIC.
Installation and Operation
The ES931C/MIC requires a compatible Audio-Technica power
module (not included) 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” bet ween
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.
Avoid leaving the microphone in the open sun or in areas
where temperatures exceed 110°F (43°C) for extended periods.
Extremely high humidit y 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 por table applications. It shall have a
cardioid polar pattern with a uniform 120° 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 AudioTechnica 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 1
V, 1 Pascal. It shall offer outstanding rejection of radio frequency
interference (RFI) . The microphone shall incorporate a special
TA3F-type output connector designed to optimize RFI immunit y.
A two-stage foam windscreen shall be included.
120°120°
MIC AMIC B
3 TIMES
DISTANCE “X”
Figure 1
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ES931C/MIC & ES931WC/MIC
Cardioid Condenser Gooseneck Microphones
The microphone shall be a small-diameter gooseneck design, with
an overall length (with capsule) of 152.4 mm and a head diameter
of 8.4 mm. Weight shall be 39 grams. The microphone shall be
black [white] .
The Audio-Technica ES931C/MIC (ES9 31WC/MIC) is specified.
0.33"
8.4 mm
6.0"
152.4 mm
0.24"
6.0 mm
Specifications
Element Fixed-charge back plate,
permanently polarized condenser
Polar pattern Cardioid
Frequency response 30-20,00 0 Hz
Open circuit sensitivit y –40 dB (10.0 mV) re 1V at 1 Pa
Maximum input sound level 138 dB SPL , 1 kHz at 1% T.H.D.
Dynamic range (t ypical) 109 dB, 1 kHz at Max SPL
Signal-to-noise ratio1 65 dB, 1 kHz at 1 Pa
Weight 39 g
Dimensions 152.4 mm long (with capsule) ,
8.4 mm head diameter, 11.6 mm base diameter
Output connector TA3F-type
Optional interchangeable ESE-O omnidirectional (360°)
elements ESE-H hypercardioid (100°)
ESE-ML MicroLine® (90°)
Audio -Technica case s tyle M41
Accessories furnished
ES931C/ MIC AT8109 t wo-stage foam windscreen
ES931WC /MIC AT8109 (WH) two-s tage foam windscreen
Compatible power modules AT85 34 wall /ceiling plate power module ;
AT8538 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
0.46"
11.6 mm
frequency response: 30–20,000 Hz
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
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Afin de ré duire l ’impa ct sur l’enviro nnement de l’ impre ssion d e plusieurs lan gues, le s informations
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Para r educir el impac to al me dioambiente, y redu cir la pro ducc ión de do cumen tos en v arios l eguaje s,
infor mació n de nues tros produ ctos está n dispo nibles e n nuestra pá gina del I nter net: www.audio-
technica.com.
10 dB
Response in dB
5k
10k
20k
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prov idência as info rmações do s seus produtos em di versas lingu as na www.audio-technica.c om.
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