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Audio-Technica Cardioid Condenser Boundary Microphone

Model #: U851RWb
342927
Audio-Technica
At a Glance

The phantom-powered U851RWb cardioid 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.

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Get to know this product.

The phantom-powered U851RWb cardioid 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, available separately in hypercardioid and omnidirectional polar patterns. With a heavy die-cast case and silicon foam bottom pads to minimize coupling of surface vibration to the microphone, the U851RWb 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.

  • Cardioid condenser boundary microphone
  • 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
Useful Documents
Specifications

General

ElementFixed-charge back plate, permanently polarized condenser
Polar PatternCardioid
Frequency Response20-20,000 Hz
Low Frequency Roll-Off80 Hz, 18 dB/octave
Open Circuit Sensitivity-34 dB (19.9 mV) re 1V at 1 Pa
Impedance50 ohms
Maximum Input Sound Level134 dB SPL, 1 kHz at 1% T.H.D.
Dynamic Range (Typicals)108 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)
Dimensions0.91" (23.0 mm) H x 3.30" (83.9 mm) W x 4.25" (108.0 mm) D
Output ConnectorMicrophone: TB3M-type, Cable: 3-pin XLRM-type
Cable25.0' (7.6 m) long, 0.13" (3.2 mm) diameter, 2-conductor, shielded cable with TA3F and XLRM connectors
Optional Interchangeable ElementsUE-H hypercardioid (100°), UE-O omnidirectional (360°)
Accessory FurnishedSoft protective pouch

Misc. Specs

Manufacturer Warranty2 Year
WarningProposition 65 Warning for California Residents