Audio-Technica AT831b Cardioid Condenser Lavalier Microphone
Audio-Technica AT831b Cardioid Condenser Lavalier Microphone
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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.
Audio-Technica AT831B |
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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 |