Description
When the camera or the audience can’t know a microphone is there, the Audio-Technica AT831B earns its keep. This cardioid condenser lavalier weighs next to nothing and disappears under a lapel or collar, yet it still delivers the clean, detailed pickup that broadcast, video, and live sound engineers rely on.
Its cardioid capsule rejects sound arriving from the rear, which keeps feedback in check when floor monitors or PA speakers are nearby and helps isolate the wearer’s voice from ambient stage noise. A 40Hz-20kHz frequency response captures dialogue and vocals with natural warmth and low-frequency clarity, while an included windscreen tames breath pops and plosives so post-production stays simple.
Power flexibility is built in: run the AT831B off a single 1.5V AA/UM3 battery for untethered field work, or switch to 9-52V phantom power (2mA typical) through its in-line module for studio and console setups. A three-position switch lets you go off, flat response, or engage a 150Hz low-frequency roll-off to cut handling and rumble noise on the fly.
- Element: Condenser
- Polar Pattern: Cardioid
- Frequency Response: 40Hz – 20,000Hz
- Phantom Power: 9-52V, 2mA typical
- Battery: 1.5V AA/UM3, roughly 1000 hours typical life
- Open Circuit Sensitivity: -45dB (5.6mV) re 1V at 1 Pa
- Impedance: 200 ohms
- Max SPL: 126dB (1kHz at 1% T.H.D.)
- Dynamic Range: 97dB typical (1kHz at max SPL)
- Signal-to-Noise Ratio: 65dB (1kHz at 1 Pa)
- Weight: 0.1 oz (2.8g)
- Output: XLRM-type via power module
Whether you’re miking a presenter for broadcast, a performer on stage, or a subject on camera, the AT831B stays out of sight and delivers audio that stays out of the way of the story.
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