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Audio-Technica AT-U851R Boundary Microphone

Black Cardioid Condenser Boundary Microphone

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What's in the box:

  • Audio-Technica U851R Cardioid Condenser Boundary Microphone (Black)
  • Soft Protective Pouch
  • 25' Cable with TA3F & XLRM-Type Connectors
  • Limited 2-Year Warranty

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Outstanding speech intelligibility and transparent sound quality for surface-mount applications.

    Audio-Technica is featuring breakthrough audio and mechanical design innovations, the phantom-powered U851R offers outstanding speech intelligibility and transparent sound quality for surface-mount applications. The microphone is equipped with a PivotPoint® rotating output connector, UniSteep® filter and UniGuard® RFI-shielding technology. It accepts interchangeable condenser elements-available for boundary microphones in cardioid, 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 U851R is equipped with self-contained electronics, eliminating the need for an external power module.


  • Designed for surface-mount applications such as high-quality sound reinforcement, professional recording, television, conferencing and other demanding sound pickup situations

  • PivotPoint® rotating output connector allows cable to exit from either the rear or the bottom of the microphone

  • Superior off-axis rejection for maximum gain before feedback
  • UniGuard® RFI-shielding technology offers outstanding rejection of radio frequency interference (RFI)
  • Self-contained electronics eliminate need for external power module
  • Small-diameter UniPoint® capsule near boundary eliminates phase distortion and delivers clear, high-output performance
  • 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
  • Available in two colors: black (U851R) and white (U851RW)

Specifications for the Audio-Technica AT-U851R

{ "ELEMENT" : "Fixed-charge back plate, permanently polarized condenser", "POLAR PATTERN" : [ "Half-cardioid", "(cardioid in hemisphere above mounting surface)" ], "FREQUENCY RESPONSE" : "30-20,000 Hz", "LOW FREQUENCY ROLL-OFF" : "80 Hz, 18 dB/octave", "OPEN CIRCUIT SENSITIVITY" : "–34 dB (19.9 mV) re 1V at 1 Pa", "IMPEDANCE" : "200 ohms", "MAXIMUM INPUT SOUND LEVEL" : "134 dB SPL, 1 kHz at 1% T.H.D.", "DYNAMIC RANGE (typical)" : "108 dB, 1 kHz at Max SPL", "SIGNAL-TO-NOISE RATIO" : "68 dB, 1 kHz at 1 Pa", "PHANTOM POWER REQUIREMENTS" : "11-52V DC, 4 mA typical", "SWITCH" : "Flat, roll-off", "WEIGHT" : "9.2 oz (262 g)", "DIMENSIONS" : [ "4.25" (108.0 mm) long,", "3.31" (84.0 mm) maximum width,", "0.91" (23.0 mm) height" ], "OUTPUT CONNECTOR" : "TB3M-type", "CABLE" : "25.0' (7.6 m) long, 0.13" (3.2 mm) diameter, 2-conductor, shielded cable with TA3F and XLRM-type connectors", "OPTIONAL INTERCHANGEABLE ELEMENTS" : [ "UE-H hypercardioid (100°);", "UE-O omnidirectional (360°)" ], "ACCESSORY FURNISHED" : "Soft protective pouch" }

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