Product Highlights
  • Lavalier Microphone
  • Cardioid Pickup Pattern
  • XLR-3M Connection
  • 40 Hz - 20 kHz Frequency Range
  • 200Ω Output Impedance
  • AA Battery Type
  • 9-52 V DC Phantom Power
Audio Technica AT831B Miniature Cardioid Condenser Microphone Audio Technica AT831B Miniature Cardioid Cond...
Web Availability: Special Order
This product will be Special Ordered just for you from the manufacturer. We do not stock this item due to its uniqueness or import schedule. Special Order items are Final Sale, see our Return Policy for details.
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  • Ottawa Special Order
  • Mississauga Special Order
  • Calgary Special Order
  • Edmonton Special Order
Please call and verify availability at the store as stock changes daily.


The Audio-Technica AT831B 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.

Key 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.

What's Included

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


Product Specifications


Detailed Specifications
Transducer         Permanently Polarized Condenser
Polar Pattern     Cardioid
Frequency Response     40 Hz - 20 kHz
Dynamic Range (Typical)     101 dB, (@ Maximum SPL)
Signal-to-Noise Ratio     65 dB, (A-Weighted)
Maximum Input Sound Level 126 dB, (@ 1 kHz 1% THD)
Power Requirements     Phantom: 9 - 52v DC
Battery: AA (1.5v)
Output Impedance     200 Ohms
Output Connectors     XLR-3M Type, (from AT8531 Power Module)
Pad     None
Low Frequency Roll-Off     -6 dB / Octave @ 150 Hz
Dimensions     Microphone: .98 x .39" (25 x 10 mm) L x Diameter
Power Module: 3.27 x 2.48 x 0.87" (83 x 63 x 22mm) L x W x D
Cable: 6' (1.8 m) Long
Weight     Microphone: 0.1 oz. (2.8 g) Less Cable and Accessories
Power Module: 5.2 oz. (147 g)

Questions & Answers

Audio Technica AT831B Miniature Cardioid Condenser Microphone

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