Omnidirectional Condenser Boundary Microphone

  • 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
  • PivotPoint™ rotating output connector allows cable to exit from either the rear or the bottom of the microphone
  • Small-diameter UniPoint™ capsule near boundary eliminates phase distortion and delivers clear, high-output performance
  • UniGuard™ RFI-shielding technology offers outstanding rejection of radio frequency interference (RFI)
  • 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

  • U851RbO Specifications


    Fixed-charge back plate, permanently polarized condenser

    Polar Pattern


    Frequency Response

    20 ~ 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


    50 Ω

    Maximum Input Sound Level

    132 dB SPL, 1 kHz at 1% T.H.D.


    21 dB SPL (A-weighted)

    Dynamic Range (Typical)

    111 dB,1 kHz at Max SPL

    Signal-To-Noise Ratio

    73 dB (1kHz at 1Pa, A-weighted)

    Phantom Power

    11-52V DC, 4.4 mA typical


    Low cut: on/off


    253 g


    23mm × 83.9mm × 108mm (H×W×D)

    Output Connector

    TB3M-type (Microphone), 3-pin XLRM-type (Cable)


    7.6m Microphone black cable (TA3F, XLRM)

    Accessories Furnished

    Soft protective pouch

    Accessories (Optional)

    Interchangeable elements - UE-C cardioid (120°), UE-H hypercardioid (100°)


    audio technica support U851RbO_UM_EN.pdf - U851RbO User Manual
    audio technica support U851RbO_UM_TC.pdf - U851RbO User Manual (Chinese)