Audio Technica AT831b Specifications

AT831b 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 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 battery or phantom power
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 AT831b requires 11-52V DC phantom power, or a 1.5V AA
battery for operation. A battery need not be in place for phantom
power operation.
Battery installation: Remove the cap from the top of the power
module. Insert a fresh 1.5V AA battery ("+" end toward the
cap release button), then reassemble the power module. Alkaline
batteries are recommended for longest life. Remove the battery
during long-term storage.
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
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.
® filter provides easy switching
AT831b SPECIFICATIONS †
ELEMENT
POLAR PATTERN
FREQUENCY RESPONSE
LOW FREQUENCY ROLL-OFF
OPEN CIRCUIT SENSITIVITY
(Phantom / Battery)
IMPEDANCE (Phantom / Battery)
MAXIMUM INPUT SOUND LEVEL
(Phantom / Battery)
DYNAMIC RANGE (typical)
(Phantom / Battery)
SIGNAL-TO-NOISE RATIO 1
PHANTOM POWER
REQUIREMENTS
BATTERY TYPE
BATTERY CURRENT / LIFE
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
P52048 ©2008 Audio-Technica U.S., Inc.
Fixed-charge back plate
permanently polarized
condenser
Cardioid
40-18,000 Hz
80 Hz, 18 dB/octave
–44 dB (6.3 mV) /
–46 dB (5.0 mV) re 1V at 1 Pa*
200 ohms / 270 ohms
135 dB / 121 dB SPL,
1 kHz at 1% T.H.D.
106 dB / 92 dB,
1 kHz at Max SPL
65 dB, 1 kHz at 1 Pa*
11-52V DC, 2 mA typical
1.5V AA/UM3
0.4 mA / 1200 hours typical
(alkaline)
Off, on-flat, on-roll-off
2.8 g (0.1 oz)
139 g (4.9 oz)
25.0 mm (0.98") long,
10.2 mm (0.40") diameter
84.0 mm (3.31") H x
63.0 mm (2.48") W x
22.0 mm (0.87") D
Integral 3-pin XLRM-type
1.8 m (6') long (permanently
attached to microphone),
2.6 mm ( 0.10") diameter,
2-conductor, shielded cable
with TA3F-type connector
AT8531 power module;
AT8419 clothing clip;
AT8444 instrument adapter;
AT8116 windscreen; battery;
protective carrying case
Frequency Response
Frequency in Hertz
12" or more on axis
Roll-off
Printed in Japan