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Omnidirectional Condenser Boundary Microphone


  • Designed for surface-mount applications such as high-quality sound reinforcement, professional recording, television, conferencing and other demanding sound pickup situations
  • Low-profile element provides uniform omnidirectional polar pattern with 360º acceptance angle
  • PivotPoint® rotating output connector allows cable to exit from either the rear or the bottom of the microphones
  • Small-diameter UniPoint omnidirectional capsule near boundary eliminates phase distortion and delivers clear, high-output performance
  • UniGuard® RFI-shielding technology offers outstanding rejection of radio frequency interference (RFI)
  • Self-contained electronics eliminate need for external power module
  • UniSteep® filter provides a steep low-frequency attenuation to improve sound pickup without affecting voice quality
  • Heavy die-cast case and non-slip silicon foam bottom pads minimize coupling of surface vibration to the microphone
  • Low-profile design with low-reflectance finish for minimum visibility

    • audio technica U851RO
    • audio technica U851RO
    • audio technica U851RO
    • audio technica U851RO
  • U851RO Specifications

    Fixed-charge back plate, permanently polarized condenser
    Frequency Response
    30 ~ 20,000 Hz
    Polar Pattern
    Omnidirectional in hemisphere above mounting surface
    Low Frequency Roll-Off
    80 Hz, 18 dB/octave
    Open Circuit Sensitivity
    -31 dB (28.2 mV) re 1V at 1 Pa
    200 Ω
    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
    Flat, Roll-off
    262 g
    23.0mm X 108.0mm X 84.0mm (H X W X D)
    Output Connector
    7.6 m long, 3.2 mm diameter, 2-conductor shielded cable with TA3F-type and XLRM connector.
    Accessories Furnished
    Soft protective pouch


    audio technica support U851RO.pdf - Operation Manual