Designed to deliver easy, flexible control in
conference and boardroom installations, the versatile U891R cardioid condenser
boundary microphone features a touch-sensitive on-off switch that can be set to
three modes: press-on/press-off, press to talk, and press to mute. The
phantom-powered microphone is equipped with a unique PivotPoint™ rotating output
connector and an LED status indicator. UniGuard™ innovations offer unsurpassed
immunity from radio frequency interference; interchangeable elements are
available in cardioid, hypercardioid and omnidirectional polar patterns; an 80
Hz low-cut UniSteep® filter reduces pickup of low-frequency ambient noise. The
microphone’s heavy die-cast case and silicon foam bottom pads minimize coupling
of surface vibration to the microphone. The unit’s self-contained electronics
eliminate 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
* 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
* 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)
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 130 dB SPL, 1 kHz at 1% T.H.D.
DYNAMIC RANGE (typical) 104 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
SWITCHES Touch-sensitive control: on/off;
Switch function: touch on/off, momentary on, momentary off;
Flat, roll-off
WEIGHT 9.3 oz (264 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
