Audio-Technica U851Rb Cardioid Condenser Boundary Microphone, Black

The phantom-powered U851Rb 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 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.

Key Features

• 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 deg to 360 deg
• 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
• Available in two colors: black (U851Rb) and white (U851RWb)

Technical Specifications

ELEMENT
Fixed-charge back plate, permanently polarized condenser
POLAR PATTERN
Cardioid
FREQUENCY RESPONSE
20-20,000 Hz
LOW FREQUENCY ROLL-OFF
80 Hz, 18 dB/octave
OPEN CIRCUIt'sENSITIVITY
-34 dB (19.9 mV) re 1V at 1 Pa
IMPEDANCE
50 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, A-weighted
PHANTOM POWER REQUIREMENTS
11-52V DC, 4.4 mA
SWITCH
Flat, roll-off
WEIGHT
253 g (8.9 oz)
DIMENSIONS
0.91" (23.0 mm) H x 3.30" (83.9 mm) W x 4.25" (108.0 mm) D
OUTPUT CONNECTOR
Microphone: TB3M-type
Cable: 3-pin XLRM-type
CABLE
25.0' (7.6 m) long, 0.13" (3.2 mm) diameter, 2-conductor, shielded cable with TA3F and XLRM connectors
OPTIONAL INTERCHANGEABLE ELEMENTS
UE-H hypercardioid (100 deg)
UE-O omnidirectional (360 deg)
ACCESSORY FURNISHED
Soft protective pouch