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Cardioid Condenser Lavalier Microphone

U.S. Five-Year Limited End-User Warranty

*Manufacturer's Suggested Retail Price. Actual selling price may vary; please check with an authorized Audio-Technica dealer.

  • Overview
  • Features
  • Specifications
  • Downloads
  • Reviews
  • Q & A

  • Overview

    This clip-on lavalier mic provides crisp, full-sounding voice pickup and excels as an instrument mic, especially for pickup of acoustic guitar with included AT8444 guitar adapter. It offers excellent gain before feedback and suppression of background noise. An integral 80 Hz high-pass filter provides easy switching from a flat frequency response to a low-end roll-off. It operates on battery or phantom power.

  • Features

    • Clip-on lavalier mic also excels in acoustic guitar applications

    • Provides crisp, full-sounding voice and instrument pickup

    • Operates on battery or phantom power

    • 6' (1.8 m) cable permanently attached to mic, TA3F connector at power module

    • Also available as:
      AT831R – with phantom-only power module
      AT831c – less power module; includes clothing clip and windscreen only; 10' (3 m) cable, unterminated
      AT831cW – less power module; includes clothing clip and windscreen only; 55" (1.4 m) cable terminated with locking 4-pin connector for A-T UniPak® wireless systems
      AT831cT5 – less power module; includes clothing clip and windscreen only; 55" (1.4 m) cable terminated with TA5F connector

  • Specifications

    ELEMENTFixed-charge back plate, permanently polarized condenser
    LOW FREQUENCY ROLL-OFF80 Hz, 18 dB/octave
    OPEN CIRCUIT SENSITIVITYPhantom: -44 dB (6.3 mV) re 1V at 1 Pa
    Battery: -46 dB (5.0 mV) re 1V at 1 Pa
    IMPEDANCEPhantom: 200 ohms
    Battery: 270 ohms
    MAXIMUM INPUT SOUND LEVELPhantom: 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 RATIO65 dB, 1 kHz at 1 Pa
    BATTERY CURRENT / LIFE0.4 mA / 1200 hours typical (alkaline)
    SWITCHOff, on-flat, on-roll-off
    WEIGHT (MICROPHONE)0.1 oz (2.8 g)
    WEIGHT (POWER MODULE)4.9 oz (139 g)
    DIMENSIONS (MICROPHONE)0.98" (25.0 mm) long,
    0.40" (10.2 mm) diameter
    DIMENSIONS (POWER MODULE)3.31" (84.0 mm) H x
    2.48" (63.0 mm) W x
    0.87" (22.0 mm) D
    CABLE6' (1.8 m) long (permanently attached to microphone), 0.10" (2.6 mm) diameter, 2-conductor, shielded cable with TA3F-type connector
    ACCESSORIES FURNISHEDClothing clip; AT8444 instrument adapter; AT8531 power module; AT8116 windscreen; battery; protective carrying case
    Click on the chart to view the larger image

  • Downloads

    AT831b Specification Sheet (pdf 409.04 KB)
    AT831b Submittal Sheet (pdf 286.84 KB)
    Optional Windscreens / Mounts
  • Reviews



    I selected this mic to use with the System 10 Pro , just purchased. Sound for a Presenter ! Very, very Good - Excellent !

    North Hills


    This product has great features


    Pros: veil-free sound, good space imaging Cons: slight high-pitched voice absence and few glitter. Good value for money.

    Budapest, Hungary

    Good microphone but could use more mounting options


    I bought this microphone to use on acoustic guitar. The included sound hole mount works and the adjustment allows for some limited tonal adjustments. Audio-Technica should consider offering additional instrument mounts for this quality microphone such as the 4099G mount offered by DPA that positions the microphone over the fretboard of the guitar for more natural sound. I prototyped an alternative such mount and the results are encouraging.

    S. E. Pennsylvania

    AT831b Cardioid Condenser Lavalier Microphone

    4.3 3


  • Q & A

    Greetings, I have bought two is these to put at the edge of the sound hole on Mr guitars and they work all good. Would you have any recommendations that would work even better, on guitar and preferably "clip on/gooseneck"-solution. Also, is it possible to buy extra lid for the preamp, mine has been lost. Regards Peter


    You may contact Audio-Technica Europe for further assistance.


    Hello, thank you for your time! I am looking to bypass the belt clip preamp in order to go straight into an interface which supplies 15 volts of phantom power. Could I use a ta3f to xlr adapter and then connect to my interface with an xlr? Thanks Again, Sean


    You cannot do this. The inline power module (preamp) is a necessary component. Among other things, it converts phantom power to a much lower bias voltage (around 5 V DC) to power the FET in the mic capsule. Sending 15 volts of phantom power to the capsule will destroy it.


    The at831b is made in china?


    The AT831b Microphone is not made in China.


    Hello, I want to buy 3 mics AT831b, the price of $ 199 already include the phantom power unit?


    Thank you for your inquiry. Yes, this includes the power module.


    Is this an omnidirectional microphone?


    No, The AT831b has a directional cardioid pickup pattern.


    I need the cable to connect with a 1/4" cable to run into my amp, will this do that or otherwise how will I be able to interface with my amp?


    Depending on your amp, you may need an impedance transformer such as the CP8201. If your amp is looking for a LINE level signal (such as a guitar or keyboard amp), use a standard XLR cable from the AT831b power module to the CP8201, then into your LINE level input on the amp.


    will this work with the AT8418.


    Technically, they are not compatible. With that being said, the AT831 body is a bit smaller and will fit into the AT8418.


    I'm having some problems with excess breathing sound coming through. I've tried having it clipped higher and lower but can't seems to get rid of it. Anything that could help this?


    Please contact our Audio Solutions Department at (330) 686-2600 ext 5000 or at for assistance with this.


    I need a new mic. I make a lot of software instructional YouTube videos via a screen recording app. I'm currently using an AKG C520 condenser headset mic, running through studio grade preamps and converters. However, I'm not happy with the overall tonal quality that headsets tend to provide. IMO, the sound is generally thin and compressed, partly due to the capsule and its distance and angle relationship to the mouth. Reading through your lavalier type mics it seems that the AT831b might be an excellent choice for this type of application. Would you agree, or do you recommend a different model? I record in a quiet home studio and want a hands free solution that could reasonably rival, (as far as lavaliers go), an SM7 or RE20. Thanks!

    Mic for instructor

    The AT831b is a popular choice but as you know, sound is always subjective and I recommend trying it out and see if it will best suit your needs. Additionally, you may want an omni element such as the AT899 which again, may better suit your capturing needs. Overall tone may be adjusted in your post production but it is important to get good, clean audio into your recordings with a good sounding microphone element; which Audio-Technica is known for.


    I have no experience with microphones. How do I get this to work? Where does the sound go to?

    Baffled Brittany

    For technical support, please contact the Audio-Technica United States (ATUS) Audio Solutions Team at: