Audio-Technica U851Rb Cardioid Condenser Boundary Microphone (Black) U851Rb Cardioid condenser boundary microphone with integral power module, phantom power only Audio-Technica U851RB Overview 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. Cardioid condenser boundary microphone Designed for surface-mount applications such as high-quality sound reinforcement, professional recording, television, and conferencing Superior off-axis rejection for maximum gain before feedback PivotPoint rotating output connector allows cable to exit from either the rear or the bottom of the microphone Small-diameter UniPoint element near boundary eliminates phase distortion and delivers clear, high-output performance Separately available interchangeable elements permit angle of acceptance from 100° to 360° UniGuard RFI-shielding technology offers outstanding rejection of radio-frequency interference (RFI) Switchable 18 dB/octave UniSteep roll-off filter at 80 Hz Self-contained electronics eliminate need for external power module Powered via 11 to 52 VDC phantom power Heavy die-cast case and non-slip silicone foam bottom pads minimize coupling of surface vibration to the microphone Low-profile design with low-reflectance finish for minimum visibility Threaded inserts on bottom of microphone allow it to be mounted with screws for increased security Balanced TB3M output connector Includes 25' TA3F to XLR male shielded microphone cable Audio-Technica U851RB Specs 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 Maximum SPL 134 dB SPL Pad None Impedance 50 Ohms Sensitivity -34 dBV/Pa Low-Cut Filter 18 dB/Octave @ 80 Hz Dynamic Range 108 dB General Output Connectors 1 x TB3M Cable Length 25' / 7.62 m Operating Current Consumption 4.4 mA Operating Voltage 11 to 52 V 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 Packaging Info Package Weight 1.365 lb Box Dimensions (LxWxH) 10.5 x 5.5 x 2.9"
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