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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
®
lter 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 at response
or low-frequency roll-off (via integral 80 Hz high-pass UniSteep
®
lter) 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.
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.
Cable Terminations
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
®
lter provides easy switching from
a at 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 trafc, air-handling
systems, etc.), room reverberation and mechanically coupled vibrations. To
engage the UniSteep
®
lter, 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 Specications
The microphone shall be a xed 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.