U851Rb Cardioid Condenser Boundary Microphone (Black) Product Image

U851Rb Cardioid Condenser Boundary Microphone (Black)

Product Description

Achieve clear, intelligible speech reproduction with the black Audio-Technica U851Rb, a cardioid condenser boundary microphone optimized for surface-mount applications in conference rooms, houses of worship, recording studios, live event venues, and sports arenas. The high-output condenser element yields a wide frequency response of 20 Hz to 20 kHz, which can be modified via the switchable 80 Hz low-cut filter—ideal for mitigating rumble and low-frequency buildup.

The cardioid polar pattern delivers directional pickup and enhanced off-axis rejection, allowing reduced ambience and high gain before feedback. Thanks to the UniGuard RFI-shielding technology, the U851Rb impedes radio frequency interference from sources such as wireless devices, fluorescent lights, air conditioners, and more. It can be powered by 11 to 52 VDC phantom power, so no batteries or external power supplies are required. The rotatable balanced TB3M output connects to the included 25' TA3F to XLR microphone cable, ensuring easy hookup to your mixer, preamplifier, or audio interface.
Analog Performance
Sound Field Mono
Operating Principle Pressure Gradient
Capsule Electret Condenser
Circuitry Solid-State
Polar Pattern Cardioid
Frequency Range 20 Hz to 20 kHz
Signal-to-Noise Ratio 68 dB A-Weighted
Equivalent Noise Level
Maximum SPL 134 dB SPL
Pad None
Impedance 50 Ohms
Load Impedance
Sensitivity -34 dBV/Pa
Low-Cut Filter 18 dB/Octave @ 80 Hz
Dynamic Range 108 dB
Output Connectors 1 x TB3M
Cable Length 25' / 7.62 m
Operating Current Consumption 4.4 mA
Operating Voltage 11 to 52 V
Operating Temperature
Operating Humidity
Storage Temperature
Dimensions (W x H x D) 3.3 x 0.9 x 4.3" / 83.9 x 23 x 108 mm
Weight 8.92 oz / 253 g
Warranty Length Limited 2-Year Warranty