Audio-Technica AT831b

Miniature Lavalier Condenser Microphone for Voice, Acoustic Guitar, and Various Hard-to-Mic Instruments, with Cardioid Pickup Pattern, Clothing and Instrument Clips, Power Module, and Case
Audio-Technica AT831b image 1
Audio-Technica AT831b image 1
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Audio-Technica AT831b
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Not Just For Voice — Great for Acoustic Guitars, Too!

Your first glance at the Audio-Technica AT831b may make you think that this little cardioid condenser lavalier microphone is only suited for the voice — but, don't let your eyes be the judge. Many musicians and engineers are finding out just how versatile the Audio-Technica AT831b really is. If you have, say, a straight-up acoustic guitar — without electronics — you can easily use the AT831b and an included clip, to achieve a crisp, full-sounding amplified voice. You can also grab other notoriously hard-to-mic instruments and simply clip on the Audio-Technica AT831b.

Audio-Technica AT831b Condenser Lavalier Microphone at a Glance:
  • Excels on vocals, but is also a stand-out choice on acoustic guitar
  • Includes a bunch of accessories — windscreen, clip, instrument adapter, and more

Excels on vocals, but is also a stand-out choice on acoustic guitar
Audio-Technica classifies their AT831b as a lavalier microphone, but if there were a "seriously versatile" category, the AT831b would surely fit into it. And, it's for that reason that the AT831b is such a good fit for any venue — be it a school, a church, or a stage — looking to get the most out of their locker of microphones. You can use the AT831b on vocals, for excellent pickup. Yet, using an included instrument adapter clip, you can just as easily ust the AT831b to pick up acoustic guitars or other difficult-to-mic instruments. You'll be surprised by how full sounding the AT831b is — plus, with its cardioid pickup pattern, the AT831b can excel in situations where feedback or room noise tend to be problems.

Includes a bunch of accessories — windscreen, clip, instrument adapter, and more
You get a load of accessories with your AT831b, to make it suitable to nearly every miking situation. The AT831b condenser lavalier microphone comes with an attached AT8530 power module with a battery, and can use either 1.5V AA batteries or 9-52V phantom power. It also comes with the AT8116 foam windscreen to help you protect against wind noise outside. For using as a traditional lavalier microphone, just use the included AT8417 clothing clip. Or, if you're using the AT831b to mic instruments, you can use the AT8444 instrument adapter, also included. Finally, the AT831b comes with a protective case for traveling with and storing your microphone.

Audio-Technica AT831b Condenser Lavalier Microphone Features:
  • This miniature lavalier condenser microphone is hard-to-see onstage
  • Works well on vocals, acoustic guitars, and various hard-to-mic instruments
  • Includes a clothing clip and an instrument adapter clip
  • Cardioid pickup pattern helps to avoid feedback and room noise problems
  • Versatility brings you a lot of microphone for your dollar
Audio-Technica AT831b Condenser Lavalier Microphone Specifications:
  • Element: Condenser
  • Polar Pattern: Cardioid
  • Frequency Response: 40-18,000Hz
  • Low-frequency Roll-off: 80Hz, 18 dB/octave
  • Impedance (Phantom / Battery): 200 ohms / 270 ohms
  • Maximum Input Sound Level (Phantom/Battery): 135 dB / 121 dB SPL
  • Dynamic Range (Phantom/Battery): 106 dB / 92 dB
  • 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
  • Weight (less cable and accessories): Microphone .1 oz.; Power Module 4.9 oz.
  • Dimensions: Microphone .98" long, .40" diameter; Power Module 3.31" H x 2.48" W x .87" D
  • Output Connector (power module): Integral 3-pin XLRM-type
  • Cable: 6' long (permanently
  • attached to microphone), .10" diameter,
  • 2-conductor, shielded cable with TA3F-type connector
  • Included accessories: AT8531 power module; AT8417 clothing clip; AT8444 instrument adapter; AT8116 windscreen; battery; protective carrying case
The Audio-Technica AT831b condenser lavalier microphone is ready to mic a range of voices and instruments!

Additional Media

AT831b Spec Sheet
Studio Microphone Buying Guide

Tech Specs

Microphone Type Condenser
Color Black
Connector XLR
Polar Pattern Cardioid
Frequency Response 40Hz-18kHz
Max SPL 135dB SPL (1kHz at 1% THD) - Phantom; 121dB SPL - Battery
Output Impedance 200 ohms (Phantom); 270 ohm (Battery)
Signal to Noise Ratio 65dB, 1kHz at 1 Pa
Cable Length 6 ft.
Weight .3 lb.
Included Accessories AT8444 instrument adapter, AT8531 power module, AT8116 windscreen, battery, carry case
Manufacturer Part Number AT831B

Customer Reviews

Based on 2 reviews
Write your review

AT831b outstanding for autoharp

I've been using the AT831b in performance settings for over a year, and I've been thoroughly impressed with it. Autoharps are notoriously hard to mic, but this little dandy does an outstanding job capturing subtleties of sound normally lost when mic'ing with more traditional methods. I wear the AT831b in my clothing, behind the autoharp, and when combined with a good dynamic mic out in front of the instrument I'm able to produce a sound quality for the audience that is almost identical to what I hear myself. The sound quality is superb -- very natural -- and I've not had any problems with extraneous noise. Feedback issues were minimal. The AT831b is a permanent part of my gear, and I never leave home without this little gem.
Music background: Semi-Pro Musician

Met the need

I bought this for recording and performing with several obscure African instruments (segaba, karimba, and chipendani). These are instruments with very hard to reach "sweet" spots; normal mic technique did not do them justice. Has met all expectations. Am especially impressed by how good the mic sounds in recording. I have also taken to clipping it to the sound hole of my guitar as an alternative to plugging in my acoustic. A year of use, though, and the belt clip is losing its integrity. The screws on the screw-in clip stripped after about a month of use. Not a problem for studio use, but this mic isn't a true "road warrior" up to the demands of regular on-stage use. I'm probably using it pretty hard, since I have to switch it from instrument to instrument several times during a single gig.
Music background: Producer, musician
See also: Lav Mics, Audio-Technica, Audio-Technica Wireless Transmitters and Receivers, Audio-Technica Lavalier Microphones