Audio Technica AT831b Quick Start Manual

AT831b
MINATURE 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
- Switchable low-frequency roll-off
- Operates on battery or phantom power
For use as a lavalier, attach the microphone about 150mm 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 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 43°C for extended periods. Extremely high
humidity should also be avoided.

SPECIFICATIONS

ELEMENT

POLAR PATTERN

FREQUENCY RESPONSE

OPEN CIRCUIT SENSITIVITY
(Phantom / Battery)

IMPEDANCE (Phantom / Battery)

MAXIMUM INPUT SOUND LEVEL
(Phantom / Battery)
LOW FREQUENCY ROLL-OFF
DYNAMIC RANGE (typical)
(Phantom / Battery)

SIGNAL-TO-NOISE RATIO

PHANTOM POWER REQUIREMENTS 11-52V DC, 2 mA typical

BATTERY TYPE

BATTERY CURRENT / LIFE
SWITCH

WEIGHT (less cable and accessories)

MICROPHONE
POWER MODULE

DIMENSIONS

MICROPHONE
POWER MODULE
OUTPUT CONNECTOR
CABLE
ACCESSORIES FURNISHED
Polar Pattern
0°
330° 30°
300° 60°
270° 90°
120°
240°
150°
210°
180°
SCALE IS 5 DECIBELS PER DIVISION
LEGEND
200 Hz
1 kHz
5 kHz
8 kHz
Frequency Response
50 100 200 500 1k
Frequency in Hertz
LEGEND
12" or more on axis
Roll-off (MT830a)
Fixed-change back plate permanently
polarized condenser
Cardioid
40-20,000 Hz
-44 dB (6.3 mV) /
-45 dB (5.6 mV) re 1V at 1 Pa
200 ohms / 270 ohms
135 dB SPL / 121 dB SPL,
1 kHz at 1% T.H.D.
80 Hz, 18 dB/octave
106 dB / 92 dB,
1 kHz at Max SPL
65 dB, 1 kHz at 1 Pa
1.5V AA
0.4 mA / 1200 hours typical (alkaline)
Off, on-flat, roll-off
2.8 g
139 g
25.0 mm - long, 10.2 mm - diameter
84.0 x 63.0 x 22.0 (mm) - H x W x D
Integral 3-pin XLRM-type
1.8 m long (permanently attached to
microphone), 2.6 mm diameter,
2-conductor, shielded cable with TA3F
output connector
AT8531 power module;
AT8417 clothing clip;
AT8444 instrument adapter;
AT8116 windscreens;
protective carrying case
10 dB
2k 5k 10k 20k
Machida • Tokyo • Japan
FORM No. ATGC-L0151-08-E