Audio-Technica specifications AT831R MINIATURE CARDIOID CONDENSER MICROPHONE

Models: AT831R

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AT831R MINIATURE CARDIOID CONDENSER MICROPHONE

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 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.

AT831R SPECIFICATIONS

ELEMENT

Fixed-charge back plate

 

permanently polarized

 

condenser

 

 

POLAR PATTERN

Cardioid

 

 

FREQUENCY RESPONSE

40-16,000 Hz

 

 

LOW FREQUENCY ROLL-OFF

80 Hz, 18 dB/octave

 

 

OPEN CIRCUIT SENSITIVITY

–42 dB (7.9 mV) re 1V at 1 Pa*

 

 

IMPEDANCE

250 ohms

 

 

MAXIMUM INPUT SOUND LEVEL

141 dB SPL, 1 kHz at 1% T.H.D.

 

 

DYNAMIC RANGE (typical)

112 dB, 1 kHz at Max SPL

 

 

SIGNAL-TO-NOISE RATIO1

65 dB, 1 kHz at 1 Pa*

PHANTOM POWER

11-52V DC, 2 mA typical

REQUIREMENTS

 

SWITCH

Flat, roll-off

 

 

WEIGHT (less cable and accessories)

 

MICROPHONE

2.8 g (0.1 oz)

POWER MODULE

81 g (2.9 oz)

 

 

DIMENSIONS

 

MICROPHONE

25.0 mm (0.98") long,

POWER MODULE

10.2 mm (0.40") diameter

92.9 mm (3.66") long,

 

18.9 mm (0.74") diameter

 

 

OUTPUT CONNECTOR

Integral 3-pin XLRM-type

(power module)

 

 

 

CABLE

4.0 m (13.1') long (permanently

 

attached to microphone),

 

3.2 mm (0.13") diameter,

 

2-conductor, shielded cable with

 

TA3F-type connector

 

 

ACCESSORIES FURNISHED

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

1Typical, A-weighted, using Audio Precision System One. Specifications are subject to change without notice.

Polar Pattern

Frequency Response

Response in dB

Frequency in Hertz

SCALE IS 5 DECIBELS PER DIVISION

LEGEND

 

12" or more on axis

 

LEGEND

 

 

Roll-off

200Hz 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

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

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Audio-Technica specifications AT831R MINIATURE CARDIOID CONDENSER MICROPHONE