Audio Technica U851R Condenser Boundary Microphone

Featuring breakthrough audio and mechanical design innovations, the phantom-powered U851R offers outstanding speech intelligibility and transparent sound quality for surface-mount applications. The microphone is equipped with a PivotPoint rotating output connector, UniSteep filter and UniGuard RFI-shielding technology. It accepts interchangeable condenser elements--available for boundary microphones in cardioid, 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 U851R is equipped with self-contained electronics, eliminating the need for an external power module.

Features
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

Superior off-axis rejection for maximum gain before feedback

UniGuard RFI-shielding technology offers outstanding rejection of radio frequency interference (RFI)

Self-contained electronics eliminate need for external power module

Small-diameter UniPoint(R) capsule near boundary eliminates phase distortion and delivers clear, high-output performance

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

Technical Info

Element: Fixed-charge back plate, permanently polarized condenser

Polar Pattern: Half-cardioid

(cardioid in hemisphere above mounting surface)

Freq. Response: 30-20,000 Hz

LF Roll Off: 80 Hz, 18 dB/octave

Open Circuit Sensitivity: -34 dB (19.9 mV) re 1V at 1 Pa

Impedance: 200 ohms

Max Input Sound Level: 134 dB SPL, 1 kHz at 1% T.H.D.

Dynamic Range (typical): 108 dB, 1 kHz at Max SPL

Signal-to-Noise Ratio: 68 dB, 1 kHz at 1 Pa

Phantom Power Requirements: 11-52V DC, 4 mA typical

Switch: Flat, roll-off

Weight: 9.2 oz (262 g)

Dimensions: 4.25 in. (108.0 mm) long,
3.31 in. (84.0 mm) maximum width,
0.91 in. (23.0 mm) height

Output Connector: TB3M-type

Cable: 25.0 ft (7.6 m) long, 0.13 in. (3.2 mm) diameter, 2-conductor, shielded cable with TA3F and XLRM-type connectors

Accessory Furnished: Soft protective pouch