Audio Technica U851R Unipoint Cardioid condenser boundary microphone

AUDIOTECHNICA U851R Details ^top

U851R
Cardioid 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.

• 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 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
  

• Available in two colors: black (U851R) and white (U851RW)
  

AUDIOTECHNICA U851R Specs ^top

SPECIFICATIONS

ELEMENT Fixed-charge back plate, permanently polarized condenser

POLAR PATTERN Half-cardioid
(cardioid in hemisphere above mounting surface)

FREQUENCY RESPONSE 30-20,000 Hz

LOW FREQUENCY ROLL-OFF 80 Hz, 18 dB/octave

OPEN CIRCUIT SENSITIVITY –34 dB (19.9 mV) re 1V at 1 Pa

IMPEDANCE 200 ohms

MAXIMUM 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" (108.0 mm) long,
3.31" (84.0 mm) maximum width,
0.91" (23.0 mm) height

OUTPUT CONNECTOR TB3M-type

CABLE 25.0' (7.6 m) long, 0.13" (3.2 mm) diameter, 2-conductor, shielded cable with TA3F and XLRM-type connectors

OPTIONAL INTERCHANGEABLE ELEMENTS UE-H hypercardioid (100°);
UE-O omnidirectional (360°)

ACCESSORY FURNISHED Soft protective pouch

AUDIOTECHNICA U851R Documentation ^top