Audio-Technica U851RO

U851RO, Boundary microphone from Audio-Technica.

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Audio-Technica U851RO

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Audio-Technica brings to market the new U851RO Omnidirectional Condenser Boundary Microphone.


The U851RO is phantom-powered and is designed with sound reinforcement, professional recording, television, conferencing and other sound pickup situations in mind.


The U851RO’s UniPoint capsule near the boundary is designed to eliminate phase distortion. The unit is equipped with a PivotPoint rotating output connector, allowing the cable to exit from either the rear or the bottom of the microphone; a UniSteep filter,designed to improve sound pickup without affecting voice quality; and UniGuard RFI-shielding technologye. It accepts interchangeable condenser elements in cardioid and hypercardioid polar patterns.


The U851RO comes with a black finish in a die-cast case and silicon foam bottom pads. The U851RO’s element provides an omnidirectional polar pattern with a 360-degree acceptance angle.


U851RO 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
-31 dB (28.2 mV) re 1V at 1 Pa
  • Impedance
200 ohms
  • Maximum Input Sound Level
132 dB SPL, 1 kHz at 1% T.H.D.
  • Dynamic Range (typical)
111 dB, 1 kHz at Max SPL
  • Signal-to-Noise Ratio
73 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) maximum length,
3.31" (84.0 mm) maximum width,
0.91" (23.0 mm) maximum height

  • Output Connector
  • Cable

25' (7.6 m) long, 0.13" (3.2 mm) diameter, 2-conductor, shielded cable with TA3F-type and XLRM-type connectors

  • Optional Interchangeable Elements
UE-C cardioid (120°); UE-H hypercardioid (100°)
  • Accessory Furnished
Soft protective pouch


Pricing & Availability

The U851RO Omnidirectional Condenser  Boundary Microphone is currently available with a U.S. MSRP of $313.00.


For more information, visit

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