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U891R / U891RW
• UniGuard
™
RFI-shielding technology offers outstanding rejection
of radio frequency interference (RFI)
• 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 (U891R) and white (U891RW)
The U891R requires 11V to 52V phantom power for operation.
Supplied as a cardioid, the U891R accepts interchangeable
elements to permit selection of angle of acceptance from 100° to
360°.
The microphone should be placed on a flat,
unobstructed mounting surface, with the front
of the microphone facing the sound source.
60°
The sound source should not be below, or
IDEAL
WORKING
ANGLE
higher than 60° above, the plane of the
mounting surface.
A touch-sensitive on/off switch on the U891R offers three choices of
switching modes. A switch located on the bottom of the microphone
selects the desired mode. TOUCH ON/OFF: Touch the on/off switch
once to turn the microphone on; touch again to turn off. MOM. ON
(momentary on): Microphone is on only while the switch is being
touched ("press to talk"). MOM. OFF (momentary off): Microphone is
off only while the switch is being touched ("press to mute" function).
The red LED on the top of the unit indicates when the microphone is
"on."
Output from the microphone cable's XLRM-type connector 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.
An integral 80 Hz high-pass filter provides easy switching 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.
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 line. If you remove or replace the connectors, you may
adversely affect the unit's 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.
CARDIOID CONDENSER BOUNDARY
MICROPHONES WITH SWITCH
• Designed for surface-mount
applications such as high-
quality sound reinforcement,
professional recording,
television, conferencing and
other demanding sound pickup
situations
• Ultra-quiet electronic switch
can be set to any of three
operating modes: "touch-
on/touch-off," "touch-to-talk"
and "touch-to-mute"
• 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
U891R / U891RW SPECIFICATIONS
ELEMENT
POLAR PATTERN
FREQUENCY RESPONSE
LOW FREQUENCY ROLL-OFF
OPEN CIRCUIT SENSITIVITY
IMPEDANCE
MAXIMUM INPUT SOUND LEVEL
DYNAMIC RANGE (typical)
SIGNAL-TO-NOISE RATIO
1
PHANTOM POWER REQUIREMENTS 11-52V DC, 4 mA typical
SWITCHES
WEIGHT
DIMENSIONS
OUTPUT CONNECTOR
CABLE
OPTIONAL INTERCHANGEABLE
ELEMENTS
ACCESSORY FURNISHED
† In the interest of standards development, A.T .U.S. offers full details on its test
methods to other industry professionals on request.
*1 Pascal = 10 dynes /cm
2
= 10 microbars = 94 dB SPL
1
Typical, A-weighted, using Audio Precision System One.
Specifications are subject to change without notice.
Polar Pattern
LEGEND
SCALE IS 5 DECIBELS PER DIVISION
LEGEND
200 Hz
1 kHz
5 kHz
8 kHz
Audio-Technica U.S., Inc., 1221 Commerce Drive, Stow, Ohio 44224
Audio-Technica Limited, Old Lane, Leeds LS11 8AG England
www.audio-technica.com
P51703
©2005 Audio-Technica U.S., Inc.
†
Fixed-charge back plate
permanently polarized condenser
Half-cardioid
(cardioid in hemisphere above
mounting surface)
30-20,000 Hz
80 Hz, 18 dB/octave
–34 dB (19.9 mV) re 1V at 1 Pa*
200 ohms
130 dB SPL, 1 kHz at 1% T.H.D.
104 dB, 1 kHz at Max SPL
68 dB, 1 kHz at 1 Pa*
Touch-sensitive control: on/off;
Switch function: touch on/off,
momentary on, momentary off;
Flat, roll-off
9.3 oz (264 g)
4.25" (108.0 mm) long,
3.31" (84.0 mm) maximum width,
0.91" (23.0 mm) height
TB3M-type
25.0' (7.6 m) long, 0.13" (3.2 mm)
diameter, 2-conductor, shielded
cable with TA3F and XLRM-type
connectors
UE-H hypercardioid (100°);
UE-O omnidirectional (360°)
Soft protective pouch
Frequency Response
Frequency in Hertz
12" or more on axis
Roll-off
Printed in U.S.A.
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