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.
- The miniature, unobtrusive capsule allows for easy concealment underneath clothing.
- 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.
- The frequency and sensitivity response of the AT831 result in transparent, pristine audio signal reproduction with low noise floor.
Phantom: 106 dB, 1 kHz at Max SPL
Battery: 92 dB, 1 kHz at Max SPL
40 Hz to 16 kHz
Phantom: 200 Ohms
Battery: 270 Ohms
Phantom: -44 dB (6.3 mV) re 1 V at 1 Pa
Battery: -46 dB (5.0 mV) re 1 V at 1 Pa
65 dB, 1 kHz at 1 Pa
Permanently Polarized Condenser
Low Frequency Roll-Off
80 Hz, 18 dB/Octave
Maximum Input Level
Phantom: 135 dB SPL, 1 kHz at 1% T.H.D.
Battery: 121 dB SPL, 1 kHz at 1% T.H.D.
Output Connector (Power Module): Integral 3-Pin XLRM-type
Phantom Power Requirements: 11 to 52 VDC, 2 mA Typical
Package Dimensions (L x W x H)
10.35 x 4.45 x 1.75"
Microphone: 0.1 oz / 2.8 g
Power Module: 4.9 oz / 138.9 g