Audio Technica U851RO Installation And Operation

U851RO
Omnidirectional Condenser Boundary Microphone

Features

• PivotPoint ® rotating output connector allows cable to exit
from either the rear or the bottom of the microphone
• Small-diameter UniPoint omnidirectional capsule near
boundary eliminates phase distortion and delivers clear,
high-output performance
• Superior off-axis rejection for maximum gain before feedback
• UniGuard RFI-shielding technology offers outstanding rejection
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of radio frequency interference (RFI)
• Self-contained electronics eliminate need for external
power module
• UniSteep filter provides a steep low-frequency attenuation
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to improve sound pickup without affecting voice quality
• Available interchangeable elements permit angle of acceptance
from 100° to 360°
• 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

U851RO Description

The U851RO is a wide-range condenser microphone with an
omnidirectional polar pattern. It is designed for surface-mount
applications such as high-quality sound reinforcement, conferencing,
professional recording, television and other demanding sound pickup
applications.
The microphone requires 11V to 52V phantom power for operation.
The microphone is equipped with UniGuard
which offers outstanding rejection of radio frequency interference (RFI).
The microphone's omnidirectional polar pattern provides a 360° angle of
acceptance (omni in hemisphere above mounting surface). Additional
interchangeable elements with cardioid (120°) and hypercardioid (100°)
pickup patterns are available.
The microphone includes a 7 .6 m (25') output cable terminating in special
TA3F-type and XLRM-type connectors designed to optimize RFI
immunity. The output of the microphone is a TB3M-type connector. The
microphone is equipped with Audio-Technica's unique PivotPoint
output connector.
A switch permits choice of flat response or low-frequency roll-off (via
integral 80 Hz high-pass UniSteep
ambient noise.
RFI-shielding technology,
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filter) to help control undesired
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The microphone's heavy die-cast case and non-slip silicon foam
bottom pads minimize coupling of surface vibration to the microphone.
The microphone includes a soft protective pouch and features a low-
reflectance black finish.
Installation and Operation
The U851RO requires 11V to 52V phantom power for operation.
Output is low impedance (Lo-Z) balanced. The signal appears across Pins
2 and 3; Pin 1 is ground (shield). Output phase is "Pin 2 hot"— positive
acoustic pressure produces positive voltage at Pin 2.
The microphone should be placed on a flat, unobstructed mounting
surface. The sound source should not be below the plane of the
mounting surface.
An integral 80 Hz high-pass UniSteep
from a flat frequency response to a low-end roll-off. The roll-off position
reduces the pickup of low-frequency ambient noise (such as traffic, air-
handling systems, etc.), room reverberation and mechanically coupled
vibrations. To engage the UniSteep
"bent" line.
The microphone's PivotPoint
to exit from either the rear or the bottom of the microphone without the
need for tools or disassembly.
Avoid leaving the microphone in the open sun or in areas where
temperatures exceed 110° F (43° C) for extended periods. Extremely high
humidity should also be avoided.
Note: Audio-Technica has developed a special RFI-shielding mechanism,
which is an integral part of the connectors in the UniPoint
remove or replace the connector, you may adversely affect the unit's
RFI immunity. Audio-Technica offers a crimp tool (ATCT) and RFI shields
that enable you to shorten the cable and correctly reinstall the connector
while maintaining the highest level of RFI immunity.
Note: Placing any object on a surface (such as a conference table) before
its finish is fully cured may result in damage to the finish.
rotating
®
unipoint
filter provides easy switching
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® filter, slide the switch toward the
rotating output connector allows the cable
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microphones
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line. If you