- Cardioid condenser boundary microphone
- Designed for surface-mount applications such as high-quality sound reinforcement, professional recording, television, conferencing and other demanding sound pickup situations
- Superior off-axis rejection for maximum gain before feedback
- Cardioid condenser boundary microphone
- Designed for surface-mount applications such as high-quality sound reinforcement, professional recording, television, conferencing and other demanding sound pickup situations
- Superior off-axis rejection for maximum gain before feedback
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Become an ADI Customer- Cardioid condenser boundary microphone
- Designed for surface-mount applications such as high-quality sound reinforcement, professional recording, television, conferencing and other demanding sound pickup situations
- Superior off-axis rejection for maximum gain before feedback

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Product Overview
The phantom-powered U851Rb cardioid condenser boundary microphone offers outstanding speech intelligibility and transparent sound quality for surface-mount applications such as high-quality sound reinforcement, professional recording, television, conferencing and other demanding sound pickup situations. The microphone is equipped with a PivotPoint® rotating output connector, UniSteep® filter and UniGuard® RFI-shielding technology. It accepts interchangeable condenser elements, available separately in hypercardioid and omnidirectional polar patterns. With a heavy die-cast case and silicon foam bottom pads to minimize coupling of surface vibration to the microphone, the U851Rb is equipped with self-contained electronics, eliminating the need for an external power module. Threaded inserts on the bottom of the microphone allow it to be mounted with screws for increased security.
Available in two colors: black (U851Rb) and white (U851RWb).Main Features
- Cardioid condenser boundary microphone
- Designed for surface-mount applications such as high-quality sound reinforcement, professional recording, television, conferencing and other demanding sound pickup situations
- 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
- Available interchangeable elements permit angle of acceptance from 100° to 360°
- UniGuard® RFI-shielding technology offers outstanding rejection of radio frequency interference (RFI)
- Self-contained electronics eliminate need for external power module
- 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
General Information
Specifications
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ADI Part Number ME-U851RB Brand Name Audio-Technica Manufacturer Audio-Technica U.S., Inc Manufacturer Part Number U851RB Product Line UniPoint Product Model U851Rb Product Name U851Rb Cardioid Condenser Boundary Microphone Product Type Boundary Mics Weight 8.92oz
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Connectivity Technology Wired Host Interface TB3M, XLRM Polar Pattern Cardioid, Hyper-cardioid, Omni-directional Sensitivity -34dB
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Maximum Frequency Response 20 kHz Minimum Frequency Response 20Hz
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TAA Compliant No
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Microphone Technology Boundary, Condenser Microphone Type Boundary, Condenser
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Application/Usage Conferencing, Professional Recording, Sound Reinforcement, Television Cable Length 24.93' Color Black Depth 4.3" Form Factor Surface Mount Height 0.9" Width 3.3"
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Limited Warranty 2-Year
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Country of Origin JP Package Contents - U851Rb Cardioid Condenser Boundary Microphone
- Soft Protective Pouch