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The phantom powered U851Rb 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 – omnidirectional (360°), cardioid (120°), and hypercardioid (100°) – available separately. 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 configurations:

U851Rb: cardioid polar pattern (120° acceptance angle); 7.6 m cable with TA3F connector at the microphone and XLRM output connector; black finish.

U851RWb: cardioid polar pattern (120° acceptance angle); 7.6 m cable with TA3F connector at the microphone and XLRM output connector; white finish.

U851RbO: omnidirectional polar pattern (360° acceptance angle); 7.6 m cable with TA3F connector at the microphone and XLRM output connector; black finish.


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

Threaded inserts on bottom of microphone allow it to be mounted with screws for increased security

Available in two colours: black (U851Rb) and white (U851RWb)

Element Fixed charge back plate, permanently polarized condenser
Frequency Response 20-20,000 Hz
Low Frequency Roll Off 80 Hz, 18 dB/octave
Open Circuit Sensitivity -34 dB (19.9 mV) re 1V at 1 Pa
Maximum Input Sound Level 134 dB SPL, 1 kHz at 1% T.H.D.
Dynamic Range 108 dB, 1 kHz at Max SPL
Signal to Noise Ratio 68 dB, 1 kHz at 1 Pa, A-weighted
Phantom Power Requirements 11-52V DC, 4.4 mA
Switches Flat, roll off
Weight 253 g
Cable 7.6 m long, 3.2 mm diameter, 2 conductor, shielded cable with TA3F and XLRM connectors
Dimensions 23.0 mm H x 83.9 mm W x 108.0 mm D
Output Connector Microphone: TB3M type
Cable: 3 pin XLRM type
Optional Interchangeable Elements UE-C cardioid (120°), UE-H hypercardioid (100°), UE-O omnidirectional (360°)
Accessories Included Soft protective pouch

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U851R Surface Boundary Mic Condenser Cardioid BLACK

  • Product Code:U851RB
  • U.O.M: ea
  • Available: 7
  • $377.41 GST Excl.
    $434.02 GST Inc.
    $433.91 GST Excl.
    $499.00 GST Inc.