Audio-Technica AT831C Specifications

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 aecting 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 trac, 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 oering 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.

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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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.

oers 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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