Audio-Technica AT831B Cardioid Condenser Lavalier Microphone

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About the Audio-Technica AT831B

The Audio-Technica AT831B Cardioid Condenser Lavalier Microphone is a miniature cardioid lavalier microphone with a sensitivity and frequency response suitable for professional video, broadcast and sound reinforcement applications. The cardioid polar pattern is effective minimizing off-axis signal, providing high gain-before-feedback while using nearby monitors and speakers.

The wide frequency response of 40Hz to 20kHz enables audio signal to be reproduced with accurate detail and minimal noise at low frequencies. The miniature capsule enables the microphone to be hidden underneath clothing and the included windscreen protects against noise caused by plosive signals and wind.

Audio-Technica AT831B Includes

  • Audio-Technica AT831B Cardioid Condenser Lavalier Microphone
  • AT8417 Clothing Clip
  • AT8444 Instrument Adapter
  • AT8531 Detachable Power Module
  • AT8116 Foam Windscreen
  • AA Battery
  • Protective Carrying Case
  • Audio-Technica 5 Years Limited Warranty

Audio-Technica AT831B Features

  • Miniature Capsule: The miniature, unobtrusive capsule allows for easy concealment underneath clothing
  • Cardioid Polar Pattern: The cardioid polar pattern is effective in minimizing audio signal at the off-axis sections of the capsule. This provides high gain-before-feedback response while using nearby monitors and speakers
  • High Sensitivity: The frequency and sensitivity response of the AT831 result in transparent, pristine audio signal reproduction with low noise floor

Audio-Technica AT831B Specifications

Element Fixed-charge back plate, permanently polarized condenser
Polar pattern Cardioid
Frequency response 40-18000 Hz
Low frequency roll-off 80 Hz, 18 dB/octave
Open circuit sensitivity Phantom: -44 dB (6.3 mV) re 1V at 1 Pa
Battery: -46 dB (5.0 mV) re 1V at 1 Pa
Impedance Phantom: 200 ohms
Battery: 270 ohms
Maximum input sound level Phantom: 135 dB SPL, 1 kHz at 1% T.H.D.
Battery: 121 dB SPL, 1 kHz at 1% T.H.D.
Dynamic range (typical) Phantom: 106 dB, 1 kHz at Max SPL
Battery: 92 dB, 1 kHz at Max SPL
Signal-to-noise ratio 65 dB, 1 kHz at 1 Pa
Phantom power requirements 11-52V DC, 2 mA typical
Battery type 1.5V AA/UM3
Battery current / life 0.4 mA / 1200 hours typical (alkaline)
Switch Off, on-flat, on-roll-off
Output connector Power module: Integral 3-pin XLRM-type
Cable Length 1.8m / 6' (permanently attached to microphone), 2.6mm / 0.10" (Diameter), 2-conductor, shielded cable with TA3Ftype connector
Audio-Technica case style M1
Dimensions Microphone: 25.0x10.2mm / 0.98x0.40" (LxDiameter)
Power Module: 84x63.0x22.0mm / 3.30x2.48x0.86" (LxWxD)
Weight Microphone: 2.8g / 0.09oz
Power module: 139g / 4.9oz
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