Audio-Technica AT831R Dépliant

Audio-Technica U.S., Inc., 1221 Commerce Drive, Stow, Ohio 44224

Audio-Technica Limited, Old Lane, Leeds LS11 8AG England

www.audio-technica.com

P52049     ©2008  Audio-Technica U.S., Inc.    Printed in Japan

SCALE IS 5 DECIBELS PER DIVISION

200 Hz

LEGEND

5 kHz

1 kHz

8 kHz

12" or more on axis

LEGEND

Roll-off

Frequency in Hertz

Response in dB

• 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 

• UniSteep

®

filter provides a steep low-frequency attenuation to 

improve sound pickup without affecting voice quality

• Operates on phantom power only 

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.

The AT831R is intended for use in professional applications where
remote power is available. It requires 11 to 52V DC phantom power,
which may be provided by a mixer or console, or by a separate, 
in-line source such as the Audio-Technica AT8801 single-channel 
or CP8506 four-channel phantom power supplies.

Output from the power module’s XLRM-type connector 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.

To avoid phase cancellation and poor sound, all mic cables must
be wired consistently: Pin 1-to-Pin 1, etc.

An integral 80 Hz high-pass UniSteep

®

filter provides easy switching

from a flat frequency response to a low-end roll-off. The roll-off
position reduces the microphone’s sensitivity to popping in close
vocal use. It also reduces the pickup of low-frequency ambient
noise (such as traffic, air-handling systems, etc.), room reverberation
and mechanically coupled vibrations.

The microphone is RoHS compliant–free from all substances 
specified in the EU directive on hazardous substances.

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.

Fixed-charge back plate 
permanently polarized 
condenser

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.

DYNAMIC RANGE (typical)

112 dB, 1 kHz at Max SPL

65 dB, 1 kHz at 1 Pa*

11-52V DC, 2 mA typical

Flat, roll-off

WEIGHT (less cable and accessories)

2.8 g (0.1 oz)

81 g (2.9 oz)

25.0 mm (0.98") long, 
10.2 mm (0.40") diameter

92.9 mm (3.66") long,  
18.9 mm (0.74") diameter

Integral 3-pin XLRM-type

(power module) 

4.0 m (13.1') long (permanently 
attached to microphone), 
3.2 mm (0.13") diameter, 
2-conductor, shielded cable with 
TA3F-type connector

AT8538 power module;
AT8419 clothing clip;
AT8444 instrument adapter;
AT8116 windscreen;
protective carrying case

†In the interest of standards development, A.T.U.S. offers full details on its test 

methods to other industry professionals on request.

*1 Pascal = 10 dynes /cm

2

= 10 microbars = 94 dB SPL

1

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

Specifications are subject to change without notice.