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Audio-Technica AT831b Cardioid Condenser Lavalier Microphone

BH #AUAT831B • MFR #AT831B
Audio-Technica AT831b Cardioid Condenser Lavalier Microphone
Key Features
  • Clip-On Lavalier Microphone
  • Great on Guitars
  • Full Rich Sound for Vocals & Instruments
  • Frequency Response: 40 Hz to 16 kHz
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.
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Audio-Technica AT831B Overview

  • 1Description
  • 2Miniature Capsule
  • 3Cardioid Polar Pattern
  • 4High Sensitivity

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 40 Hz to 16 kHz 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.

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.
UPC: 042005309078

Audio-Technica AT831B Specs

Transducer
Permanently Polarized Condenser
Polar Pattern
Cardioid
Frequency Response
40 Hz to 16 kHz
Low Frequency Roll-Off
80 Hz, 18 dB/Octave
Sensitivity
Phantom: -44 dB (6.3 mV) re 1 V at 1 Pa
Battery: -46 dB (5.0 mV) re 1 V 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
Power Requirements
Phantom Power Requirements: 11 to 52 VDC, 2 mA Typical
Battery
Battery Type: 1.5 V AA/UM3
Battery Current / Life: 0.4 mA / 1200 Hours Typical (Alkaline)
Switch
Off, On-Flat, On-Roll-Off
Output Connectors
Output Connector (Power Module): Integral 3-Pin XLRM-type
Dimensions
Microphone (L x Diam): 1.0 x 0.4" / 25.0 x 10.2 mm
Power Module: 3.3 x 2.5 x 0.9" / 84.0 x 63.0 x 22.0 mm
Cable: 6.0' / 1.8 m Long
Weight
Microphone: 0.1 oz / 2.8 g
Power Module: 4.9 oz / 138.9 g
Packaging Info
Package Weight
1.145 lb
Box Dimensions (LxWxH)
10.35 x 4.45 x 1.75"

Audio-Technica AT831B Reviews

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question

Is this wireless to the receiver/amp?
Asked by: Anonymous
Hi! No, it is completely wired. Must be connected to the receiver. I consider this microphone (AT831B) is more for passive situations, interviews where the speaker does not need to move from one place to another while shooting. Of course you can, but you need someone to watch cables and connections.Enter an answer to this question.
Answered by: Luis P.
Date published: 2018-08-28

Can this be used as a replacement microphone on ...

Can this be used as a replacement microphone on for an existing wireless system? (ta3 style connector on the existing system's body pack)
Asked by: Mike
The Audio-Technica AT831b Cardioid Condenser Lavalier Microphone can be connected directly to a wireless bodypack transmitter with a TA3 style mini-XLR input connector that is capable of supplying the proper amount of voltage needed to power the mic. The specs list the power requirement for the AT831b as 11 to 52V.
Answered by: Lisa
Date published: 2022-11-09

Is the end of the cable an XLR connector? I have ...

Is the end of the cable an XLR connector? I have phantom power on my field recorder and don't want to add any power modules.
Asked by: Daniel
The Audio-Technica AT831B terminates in a TA3 (miniXLR) connector, but the included power module has a regular XLR output.
Answered by: calvinm
Date published: 2023-07-13

question

Where can I get a wind cover for this microphone?
Asked by: Anonymous
I don't know if you're searching for a replacement wind cover or not, but this mic does come with one. It's listed in the 'In the Box' section of the item page. There is also a standalone option buy the same one that comes in the box.
Answered by: Elliot H.
Date published: 2018-08-28

Can I connect this mic through a Rode AI-1 audio ...

Can I connect this mic through a Rode AI-1 audio interface to my PC using the XLR connector from the included power module?
Asked by: Robert
Yes, the Audio-Technica AT831b Cardioid Condenser Lavalier Microphone can be connected to an audio interface such as the Rode AI-1 using an XLR cable.
Answered by: calvinm
Date published: 2024-02-27

question

Can I connect the AT 831B ( with the power supply module ) in an acoustic guitar amp with a XLR input and already providing a phantom power of 16 V?
Asked by: Anonymous
The AT831B can operate on phantom power ranging from 9-52 volts and also using battery. There would be no issue connecting to a device that provides 16V phantom via XLR.
Answered by: Jeff P.
Date published: 2018-08-28

question

Using for interviews.I'm getting a lot of noise from this microphone that I wouldn't expect. Very sensitive to any movement near the microphone like a jacket moving, heavy breaths causes overmodulation. I use the windscreen at all times and that helps some. It's pretty annoying. I've used dozens of mics over the years and have never had this much problems. Am I doing something wrong?Any suggestions? Would a unidirectional mic be better.
Asked by: Gene D.
The Audio-Technica AT831B is a unidirectional microphone, suitable for professional video, broadcast and sound reinforcement applications. The fact that it is a condenser makes it more sensitive than your traditional dynamic hand-held interview mic. In video production, condensers are preferred because of their sensitivity- especially when pristine audio is demanded. In your case, I would try a couple of things before considering a mic change. 1. Engage the low-cut filter. The power switch has three positions: off , flat , and low-cut . The low-cut filter makes the microphone less sensitive to low frequencies found in wind, breath noise, and general ambiance. 2. Consider adding the Rycote Undercover (B&H#RYUC) lavalier wind cover and adhesive mount to your sound bag. The covers help reduce rustling noise caused by cable movement and friction between the mic element and clothing.
Answered by: Andrea O.
Date published: 2018-08-28

question

Can I plug this into my Sony HandyCam (Camcorder)?
Asked by: Anonymous
I haven't looked closely at the Sony HandyCam, but most compact consumer camcorders have a 1/8 inch (3.5 mm) port to plug in a microphone. To plug this mic into that port, you'll need to get a cable that has female XLR connector at one end and male 1/8 inch (3.5 mm) plug on other end.
Answered by: Julia S.
Date published: 2018-08-28
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