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AT831R Cardioid Condenser
Lavalier Microphone
To avoid phase cancellation and poor sound, all mic cables must be wired
consistently: Pin 1-to-Pin 1, etc.
Broadcast & Production
Features
• Clip-on lavalier mic provides crisp, full-sounding voice pickup
• Also excels as an instrument mic, especially for pickup of acoustic guitar with
included AT8444 instrument adapter
• Excellent gain before feedback and suppression of background noise
• Cardioid polar pattern reduces pickup of sounds from the sides and rear,
improving isolation of desired sound source
• Rugged design and construction for reliable performance
• UniSteep® filter provides a steep low-frequency attenuation to improve sound
pickup without aecting voice quality
• Also available in wireless models (without power module) terminated for use
with all Audio-Technica wireless systems and many other manufacturers’
wireless systems
AT831R Description
The AT831R is a miniature clip-on/lavalier condenser microphone with a cardioid
polar pattern. It is designed for quality sound reinforcement, professional recording,
television and other demanding sound pickup applications.
The microphone is intended to be worn on the clothing or used as an instrument
mic for excellent yet unobtrusive sound pickup. The wide-range capability of the
microphone ensures clean, accurate reproduction with high intelligibility for speakers
and presenters as well as for instrument pickup. Its small size makes it ideal for use in
applications where minimum visibility is required.
The microphone requires 11V to 52V phantom power for operation.
The microphone’s cardioid polar pattern provides a 120° angle of acceptance.
The microphone includes a 4 m (13.1') permanently attached miniature cable. Its free
end connects to the provided AT8538 power module via a TA3F-type connector. The
output of the power module is a 3-pin XLRM-type connector.
An integral 80 Hz high-pass UniSteep
frequency response to a low-end roll-o. The roll-o position reduces the microphone’s
sensitivity to popping in close vocal use. It also reduces the pickup of low-frequency
ambient noise (such as trac, air-handling systems, etc.), room reverberation and
mechanically coupled vibrations. To engage the UniSteep
paperclip or other small pointed instrument to slide the switch toward the “bent” line.
For use as a lavalier, attach the microphone about six inches below the chin. Anticipate
movements that may cause the microphone to rub against or be covered by clothing,
and position the microphone to avoid it.
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.
Wireless Models Description
The microphone is also available in a variety of wireless models, including the
AT831cH. The AT831cH includes a 1.4 m (55") permanently attached miniature cable
terminated with a screw-down 4-pin connector for use with Audio-Technica cH-style
body-pack transmitters. Models are also available in a variety of terminations for
use with many other manufacturers’ wireless systems. No power module is included
(or required) with the wireless models. The wireless models’ dimensions and polar
pattern are otherwise identical to those of the AT831R.
The AT831cW is also available unterminated as the AT831c.
The AT831R is also available with the AT8531 power module oering battery/
phantom operation as the AT831b.
Cable Terminations
AT831cH Terminated with a screw-down 4-pin connector
for use with Audio-Technica® cH-style
body-pack transmitters
AT831cW Terminated with a locking 4-pin connector
for use with Audio-Technica® cW-style
body-pack transmitters
AT831cT4 Terminated for Shure® wireless systems using
TA4F-type connector
AT831cT5 Terminated for Lectrosonics® wireless systems
using TA5F-type connector
AT831c Unterminated
Audio-Technica® is a registered trademark of Audio-Technica. Other product and company names
mentioned herein may be trademarks and/or service marks of their respective owners.
®
filter provides easy switching from a flat
®
filter, use the end tip of a
A recessed switch in the power module permits choice of flat response or lowfrequency roll-o (via integral 80 Hz high-pass UniSteep® filter) to help control
undesired ambient noise.
The microphone comes equipped with a power module, a clothing clip, an instrument
adapter, a windscreen and a protective carrying case.
Operation and Maintenance
The AT831R requires 11V to 52V phantom power for operation.
Output is low impedance (Lo-Z) balanced. The signal appears across Pins 2 and 3;
Pin 1 is ground (shield). Output phase is “Pin 2 hot”— positive acoustic pressure
produces positive voltage at Pin 2.
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AT831R
12" or more on axis
LEGEND
Frequency in Hertz
Response in dB
10 dB
100
50
200
10k
5k
1k
500
2k
20k
Roll-off
Function Wire Color
Pin 1 Ground/Shield Green
Pin 2 Bias + In Red
Pin 3 Mic Audio Copper Color
Pin 4 Source Load Jumper to Pin 1
Pin 5 Line In Open
cT5
1
2
4
3
5
Function Wire Color
Pin 1 Ground/Shield Green
Pin 2 Instrument Jumper to Pin 1
Pin 3 Mic Audio Copper Color
Pin 4 Bias + In Red
cW
1
2
4
3
Function Wire Color
Pin 1 Ground/Shield Green
Pin 2 Instrument Jumper to Pin 1
Pin 3 Mic Audio Copper Color
Pin 4 Bias + In Red
cH
1
2
4
3
Function Wire Color
Pin 1 Ground/Shield Green
Pin 2 Bias + In Red
Pin 3 Mic Audio Copper Color
Pin 4 Source Load Jumper to Pin 3
cT4
1
2
4
3
Function Wire Color
Pin 1 N/C Open
Pin 2 N/C Open
Pin 3 Bias + In, Red
Mic Audio
Shell/Case Ground/Shield Green
cL4
1
23
Function Wire Color
Sleeve Ground/Shield Green
Ring Mic Audio Copper Color
Tip Bias + In Red
cLM3
lip
ring
sleeve
Wireless Termination Diagrams
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Der Umwelt zuliebe finden Sie die Produktinformationen in deutscher Sprache und weiteren Sprachen auf unserer
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Specifications*
Element
Fixed-charge back plate, permanently
polarized condenser
Polar pattern
Frequency response
Low frequency roll-o
Open circuit sensitivity
Impedance
Maximum input sound level
Dynamic range (typical)
Signal-to-noise ratio
Phantom power requirements
Element power requirements
Cardioid
40-16,000 Hz
80 Hz, 18 dB/octave
–42 dB (7.9 mV) re 1V at 1 Pa
250 ohms
141 dB SPL, 1 kHz at 1% T.H.D.
112 dB, 1 kHz at Max SPL
1
65 dB, 1 kHz at 1 Pa
11-52V DC, 2 mA typical
1.5-8V DC (0.15 mA current
consumption typical)
Switch
Weight
Flat, roll-o
Microphone: 2.8 g (0.1 oz)
Power module: 81 g (2.9 oz)
Dimensions
Microphone: 25.0 mm (0.98") long,
10.2 mm (0.40") diameter
Power module: 92.9 mm (3.66") long,
18.9 mm (0.74") diameter
Output connector
Power module: Integral 3-pin XLRM-type
4.0 m (13.1') long wired,
Cable
1.4 m (55") long wireless
Audio-Technica case style
Accessories furnished
M1
AT8538 power module; AT8419 clothing
clip; AT8444 instrument adapter; AT8116
windscreen; protective carrying case
In the interest of standards development, A.T.U.S.
oers full details on its test methods to other industry
1 Pascal = 10 dynes/cm
*Measured using AT8538 power module
1
Typical, A-weighted, using Audio Precision System One.
Specifications are subject to change without notice.
frequency response: 40– 16,000 Hz polar pattern
LEGEND
50
200
100
12" or more on axis
Roll-off
professionals on request.
2
= 10 microbars = 94 dB SPL
500
2k
1k
Frequency in Hertz
0˚
30˚
330˚
10 dB
5k
10k
Response in dB
20k
300˚
270˚
240˚
210˚
SCALE IS 5 DECIBELS PER DIVISION
60˚
90˚
120˚
LEGEND
200 Hz
150˚
180˚
1 kHz
5 kHz
8 kHz
Audio-Technica Corporation
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©2018 Audio-Technica P52750