U851RO Omnidirectional Condenser Boundary Microphone

Featuring breakthrough audio and mechanical design innovations, the phantom-powered U851RO offers outstanding speech intelligibility and transparent sound quality for surface-mount applications. The omnidirectional microphone is equipped with a PivotPoint® rotating output connector, UniSteep® filter and UniGuard® RFI-shielding technology. It accepts interchangeable condenser elements in cardioid and hypercardioid polar patterns. With a heavy die-cast case and silicon foam bottom pads to minimize coupling of surface vibration to the microphone, the U851RO is equipped with self-contained electronics, eliminating the need for an external power module.

Designed for surface-mount applications such as high-quality sound reinforcement, professional recording, television, conferencing and other demanding sound pickup situations

Low-profile element provides uniform omnidirectional polar pattern with 360º acceptance angle

PivotPoint® rotating output connector allows cable to exit from either the rear or the bottom of the microphone

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

UniSteep® filter provides a steep low-frequency attenuation to improve sound pickup without affecting voice quality

Self-contained electronics eliminate need for external power module

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

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

SPECIFICATIONS
ELEMENT	Fixed-charge back plate, permanently polarized condenser
POLAR PATTERN	Omnidirectional in hemisphere above mounting surface
FREQUENCY RESPONSE	30-20,000 Hz
LOW FREQUENCY ROLL-OFF	80 Hz, 18 dB/octave
OPEN CIRCUIT SENSITIVITY	–31 dB (28.2 mV) re 1V at 1 Pa
IMPEDANCE	200 ohms
MAXIMUM INPUT SOUND LEVEL	132 dB SPL, 1 kHz at 1% T.H.D.
DYNAMIC RANGE (typical)	111 dB, 1 kHz at Max SPL
SIGNAL-TO-NOISE RATIO	73 dB, 1 kHz at 1 Pa
PHANTOM POWER REQUIREMENTS	11-52V DC, 4 mA typical
SWITCH	Flat, roll-off
WEIGHT	262 g (9.2 oz)
DIMENSIONS	108.0 mm (4.25") maximum length, 84.0 mm (3.31") maximum width, 23.0 mm (0.91") maximum height
OUTPUT CONNECTOR	TB3M-type
CABLE	7.6 m (25.0') long, 3.2 mm (0.13") diameter, 2-conductor, shielded cable with TA3F-type and XLRM-type connectors
OPTIONAL INTERCHANGEABLE ELEMENTS	UE-C cardioid (120°); UE-H hypercardioid (100°)
ACCESSORY FURNISHED	Soft protective pouch