Audio Technica AT831CW Miniature Cardioid Condenser Lapel MicrophoneThe AT831 is a miniature condenser microphone with a cardioid polar pattern. It has been designed for hands-free applications in sound reinforcement systems and for use by professional musicians, especially for pickup of acoustic guitar. The AT831 provides improved gain before feedback that normally cannot be achieved with miniature omnidirectional microphones. Close-up voice and instrument pickup are crisp and clean, yet full sounding, while suppression of background noise is significantly improved over that of stand-mounted full-size cardioid microphones. Audio-Technica design engineers have utilized the newest low-mass technology in the quest for superior performance. The permanent charge is now on the fixed back plate, rather than the moving element. With A-T fixed charge “back plate” construction, a gold-vaporized diaphragm just 2 microns thick (or about 0.000079") can be used. This reduces moving mass, thus improving frequency response and transient response while reducing distortion. The microphone element is enclosed in a rugged housing with low-reflectance finish. Internal construction is designed to minimize handling and clothing noise. An AT8417 clothing clip is provided, as well as an accessory AT8116 windscreen.
Features
- Clip-on lavalier mic also excels in acoustic guitar applications
- Provides crisp, full-sounding voice and instrument pickup
- Excellent gain before feedback and suppression of background noise
The microphone can be attached to clothing using the clip provided. An open-pore foam windscreen simply slips over the head of the microphone, effectively reducing wind noise or “popping” when used extra close.
While a modern condenser microphone is not unduly sensitive to the environment, temperature extremes can be harmful. Exposure to high temperatures can result in gradual and permanent reduction of the output level. Avoid leaving the microphone in the open sun or in areas where temperatures exceed 110° F (43° C) for long periods of time. Extremely high humidity should also be avoided.
Architects and Engineers Specifications
The microphone shall be a fixed-charge condenser with a cardioid polar pattern and a frequency response of 40 Hz to 20,000 Hz.
The microphone shall be 0.98" (24.8 mm) long with a diameter of 0.40" (10.2 mm). The microphone weight shall be 0.1 oz (2.8 grams). Finish shall be low-reflectance matte.
AT831R Specifications
- Element: Condenser
- Signal to Noise Ratio: 65 dB, 1 kHz at 1 Pa
- Polar Pattern: Cardioid
- Dynamic Range (Typical): 112 dB, 1 kHz at Max. SPL
- Frequency Response: 40 - 20,000 Hz
- Phantom Power Requirements: 9 - 52V, 2 mA typical
- Open Circuit Sensitivity: -42 dB (7.9 mV) re 1V at 1 Pa
- Weight: 0.1 oz (2.8 g)
- Impedance: 200 ohms
- Maximum Input Sound Level: 141 dB SPL, 1 kHz at 1% T.H.D.
- Output Connector: Locking 4-pin connector for A-T UniPak™
