Audio-Technica U851RB Condenser Boundary Microphone

The Audio-Technica U851RB Condenser Boundary Microphone is available in different colors and polar patterns. Each option has a 25.0' (7.6 m) cable with TA3F connector at the microphone and XLRM output connector.

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. 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.

Audio-Technica U851RB Features

• 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

Microphone Configurations

• U851Rb: cardioid polar pattern (120° acceptance angle), black finish
• U851RWb: cardioid polar pattern (120° acceptance angle), white finish
• U851RbO: omnidirectional polar pattern (360° acceptance angle), black finish

• U851RB Condenser Boundary Microphone1
• Soft protective pouch1
• Two Year Limited End User Warranty1

• Transducer TypeCondenser
• Polar PatternsCardioid and Omnidirectional
• Frequency Response20 Hz - 20 kHz
• Output Impedance50 ohms
• Low Frequency Roll Off80 Hz, 18 dB/octave
• Open Circuit Sensitivity-34 dB (19.9 mV) re 1V at 1 Pa
• Maximum Input Sound Level134 dB SPL, 1 kHz at 1% T.H.D.
• Dynamic Range108 dB, 1 kHz at Max SPL
• Signal-to-Noise Ratio68 dB, 1 kHz at 1 Pa, A-weighted
• Phantom Power Requirements11-52V DC, 4.4 mA
• SwitchesFlat, roll-off
• Weight253 g (8.9 oz)
• Cable25 feet (7.6 m) long, 0.13" (3.2 mm) diameter, 2-conductor, shielded cable with TA3F and XLRM connectors
• Dimensions0.91" (23 mm) H x 3.3" (83.9 mm) W x 4.25" (108 mm) D
• Output ConnectorMicrophone: TB3M-type Cable: 3-pin XLRM-type