AT831R

Cardioid Condenser Lavalier Microphone

Features

•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

•Cardioid polar pattern reduces pickup of sounds from the sides and rear, improving isolation of desired sound source

•Rugged design and construction for reliable performance

•UniSteep® filter provides a steep low-frequency attenuation to improve sound pickup without affecting voice quality

•Also available in wireless models (without power module) terminated for use with all Audio-Technica UniPak® wireless systems and many other manufacturers' wireless systems

AT831R Description

The AT831R is a miniature clip-on/lavalier condenser microphone with a cardioid polar pattern. It is designed for quality sound reinforcement, professional recording, television and other demanding sound pickup applications.

The microphone is intended to be worn on the clothing or used as an instrument mic for excellent yet unobtrusive sound pickup. The wide- range capability of the microphone ensures clean, accurate reproduction with high intelligibility for speakers and presenters as well as for instrument pickup. Its small size makes it ideal for use in applications where minimum visibility is required.

The microphone requires 11V to 52V phantom power for operation.

The microphone’s cardioid polar pattern provides a 120° angle of acceptance.

The microphone includes a 4 m (13.1') permanently attached miniature cable. Its free end connects to the provided AT8538 power module via a TA3F-type connector. The output of the power module is a 3-pin XLRM- type connector.

A recessed switch in the power module permits choice of flat response or low-frequency roll-off (via integral 80 Hz high-pass UniSteep® filter) to help control undesired ambient noise.

The microphone comes equipped with a power module, a clothing clip, an instrument adapter, a windscreen and a protective carrying case.

broadcast & production microphones

Wireless Models Description

The microphone is also available in a variety of wireless models, including the AT831cW. The AT831cW includes a 1.4 m (55") permanently attached miniature cable terminated with a locking 4-pin connector for use with Audio-Technica UniPak® body-pack transmitters. Models are also available in a variety of terminations for use with many other manufacturers’ wireless systems. No power module is included (or required) with the wireless models. The wireless models’ dimensions and polar pattern are otherwise identical to those of the AT831R.

The AT831cW is also available unterminated as the AT831c.

The AT831R is also available with the AT8531 power module offering battery/phantom operation as the AT831b.

CableTerminations

 

AT831cW

Terminated with locking 4-pin

 

connector for use with

 

Audio-Technica UniPak®

 

body-pack transmitters

AT831cT

Terminated for Telex, HME and

 

Swintec wireless systems using

 

TA4F-type connector

AT831cT5

Terminated for Lectrosonics®

 

wireless systems using

 

TA5F-type connector

AT831HRS-6

Terminated for Samson®

 

wireless systems

AT831c

Unterminated

Audio-Technica®is a registered trademark of Audio-Technica. Other product and company names mentioned herein may be trademarks and/or service marks of their respective owners.

Operation and Maintenance

The AT831R requires 11V to 52V phantom power for operation.

Output 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. To engage the UniSteep® filter, use the end tip of a paperclip or other small pointed instrument to slide the switch toward the “bent” line.

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.

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.

Architect’s and Engineer’s Specifications

The microphone shall be a fixed charge condenser. It shall have a cardioid polar pattern with a uniform 120° angle of acceptance and a frequency response of 40 Hz to 16,000 Hz. The microphone shall operate from an external 11V to 52V DC phantom power source. It shall be capable of handling sound input levels up to 141 dB with a dynamic range of 112 dB. Nominal open-circuit output voltage shall be 7.9 mV at 1V, 1 Pascal.

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Audio-Technica dimensions Features, AT831R Description, Wireless Models Description, Operation and Maintenance
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AT831R specifications

The Audio-Technica AT831R is a professional-grade lavalier microphone, designed specifically for superior audio quality in a compact form factor. Renowned for its versatility and reliability, the AT831R is a popular choice among sound engineers, filmmakers, and presenters who require exceptional performance in various recording situations.

One of the defining features of the AT831R is its omnidirectional polar pattern. This allows the microphone to capture sound equally from all directions, making it ideal for interviews, stage performances, and broadcast applications where the speaker's movement can vary. Its broad frequency response of 30 Hz to 20 kHz ensures that it can reproduce both the richness of lower frequencies and the brightness of higher harmonics, resulting in a natural sound that adds clarity to any audio project.

The AT831R incorporates a low-frequency roll-off switch, which helps reduce bass rumble and other unwanted background noise, providing users with more control over their audio capture. This feature is particularly useful when recording in environments where handling noise or low-frequency interference might be present. The microphone also boasts a high SPL handling capability, which allows it to capture loud sound sources without distortion, making it effective for a wide range of applications, from capturing musical performances to spoken word presentations.

Another notable characteristic of the AT831R is its lightweight design and compact size. Weighing in at a mere few grams, this microphone can be clipped discreetly onto clothing, providing comfort for the speaker while remaining unobtrusive. This makes it suitable for on-stage performances, corporate events, and situations where visual clutter should be minimized.

The microphone comes equipped with a 1.2-meter cable terminated with a mini XLR connector, allowing seamless integration with a variety of audio equipment. The flexibility of the AT831R is further enhanced by its compatibility with various wireless systems, making it an excellent choice for professionals on the go.

In summary, the Audio-Technica AT831R is a high-quality lavalier microphone that combines versatility, durability, and superior sound quality. Its features, including an omnidirectional polar pattern, low-frequency roll-off switch, and high SPL handling capability, make it an invaluable tool for anyone in the audio production industry seeking a reliable and effective lavalier microphone solution. Whether for live performances, television, or film production, the AT831R is designed to exceed user expectations.
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