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AT831R
MINIATURE CARDIOID CONDENSER MICROPHONE
• 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 guitar adapter
• Ideal for higher SPL applications, such as pickup for horns with
included AT8418 UniMount
®
microphone instrument mount
• Excellent gain before feedback and suppression of background
noise
• 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 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.
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.
AT831R SPECIFICATIONS
†
ELEMENT
POLAR PATTERN
FREQUENCY RESPONSE
LOW FREQUENCY ROLL-OFF
OPEN CIRCUIT SENSITIVITY
IMPEDANCE
MAXIMUM INPUT SOUND LEVEL
DYNAMIC RANGE (typical)
SIGNAL-TO-NOISE RATIO
1
PHANTOM POWER
REQUIREMENTS
SWITCH
WEIGHT (less cable and accessories)
MICROPHONE
POWER MODULE
DIMENSIONS
MICROPHONE
POWER MODULE
OUTPUT CONNECTOR
(power module)
CABLE
ACCESSORIES FURNISHED
† 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.
Polar
Pattern
LEGEND
SCALE IS 5 DECIBELS PER DIVISION
LEGEND
200 Hz
1 kHz
5 kHz
8 kHz
Audio-Technica U.S., Inc., 1221 Commerce Drive, Stow, Ohio 44224
Audio-Technica Limited, Old Lane, Leeds LS11 8AG England
www.audio-technica.com
P51666-01
©2006 Audio-Technica U.S., Inc.
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.
112 dB, 1 kHz at Max SPL
65 dB, 1 kHz at 1 Pa*
11-52V DC, 2 mA typical
Flat, roll-off
0.1 oz (2.8 g)
2.9 oz (81 g)
0.98" (24.8 mm) long,
0.40"(10.2 mm) diameter
3.66" (92.9 mm) long,
0.74" (18.9 mm) diameter
Integral 3-pin XLRM-type
25.0' (7.6 m) long (permanently
attached to microphone), 0.13"
(3.2 mm) diameter, 2-conductor,
shielded cable with TA3F-type
connector
AT8417 clothing clip;
AT8418 UniMount
®
microphone
instrument mount;
AT8444 guitar adapter;
AT8538 power module;
AT8116 windscreen;
protective carrying case
Frequency Response
Frequency in Hertz
12" or more on axis
Roll-off
Printed in Japan
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