The U841A delivers exceptionally intelligible audio reproduction in a super-compact, low-profile design. Equipped with UniGuard™ RFI-shielding technology, this omnidirectional condenser boundary microphone is designed for clear, highly intelligible sound reinforcement, professional recording, television and conferencing in surface-mount applications. The U841A has a 360° pickup angle and operates on battery or phantom power.

• Designed for surface-mount applications such as high-quality sound reinforcement, professional recording, television, conferencing and other demanding sound pickup situations
• UniGuard™ RFI-shielding technology offers outstanding rejection of radio frequency interference (RFI)
• UniSteep® filter provides a steep low-frequency attenuation to improve sound pickup without affecting voice quality
• Small-diameter UniPoint capsule near boundary eliminates phase distortion and delivers clear, high-output performance
• Heavy die-cast case and silicon foam bottom pad minimize coupling of surface vibration to the microphone
• Low-profile design with low-reflectance black finish for minimum visibility
• Operates on battery or phantom power

Specifications

• ELEMENT: Fixed-charge back plate permanently polarized condenser
• POLAR PATTERN: Omnidirectional in hemisphere above mounting surface
• FREQUENCY RESPONSE: 30-20,000 Hz
• LOW FREQUENCY ROLL-OFF: 80 Hz, 18 dB/octave
• OPEN CIRCUIT SENSITIVITY
  • Phantom: -39 dB (11.2 mV) re 1V at 1 Pa
  • Battery: -40 dB (10.0 mV) re 1V at 1 Pa
• IMPEDANCE
  • Phantom: 200 ohms
  • Battery: 270 ohms
• MAXIMUM INPUT SOUND LEVEL
  • Phantom: 132 dB, 1 kHz at 1% T.H.D.
  • Battery: 122 dB SPL, 1 kHz at 1% T.H.D.
• DYNAMIC RANGE (typical)
  • Phantom: 111 dB, 1 kHz at Max SPL
  • Battery: 101 dB, 1 kHz at Max SPL
• SIGNAL-TO-NOISE RATIO: 73 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 (MICROPHONE): 2.8 oz (78 g)
• WEIGHT (POWER MODULE): 4.9 oz (139 g)
• DIMENSIONS (MICROPHONE): 2.56" (65.0 mm) diameter, 0.59" (15.1 mm) height
• DIMENSIONS (POWER MODULE): 3.31" (84.0 mm) H x 2.48" (63.0 mm) W x 0.87" (22.0 mm) D
• OUTPUT CONNECTOR (POWER MODULE): Integral 3-pin XLRM-type
• CABLE: 25.0' (7.6 m) long (permanently attached to microphone), 0.13" (3.2 mm) diameter, 2-conductor, shielded cable with TA3F-type connector
• ACCESSORIES FURNISHED: AT8531 power module; battery; soft protective pouch

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