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Description:

Manufacturer's website

Specs for wired version below:

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

SPECIFICATION GRAPHS
Click on the chart to view the larger image
		POLAR PATTERN
		FREQUENCY RESPONSE