The Audio-Technica phantom-powered U891R 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 80Hz 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.

Audio-Technica U891R Boundary Microphone with Switch Specifications:

• ELEMENT: Fixed-charge back plate, permanently polarized condenser
• POLAR PATTERN: Half-cardioid (cardioid in hemisphere above mounting surface)
• FREQUENCY RESPONSE: 30-20,000Hz
• LOW FREQUENCY ROLL-OFF: 80Hz,
• 18dB/octave
• OPEN CIRCUIT SENSITIVITY: —34dB (19.9 mV) re 1V at 1 Pa
• IMPEDANCE: 200 ohms
• MAXIMUM INPUT SOUND LEVEL: 130dB SPL, 1kHz at 1% T.H.D.
• DYNAMIC RANGE (TYPICAL): 104dB, 1kHz at Max SPL
• SIGNAL-TO-NOISE RATIO: 68dB, 1kHz 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: 4-1/4" (108.0mm) long, 3.31" (84.0mm) maximum width, 0.91" (23.0mm) height
• OUTPUT CONNECTOR: TB3M-type
• CABLE: 25' (7.6m) long, 0.13" (3.2mm) diameter, 2-conductor, shielded cable withTA3F and XLRM-type connectors
• OPTIONAL INTERCHANGEABLE ELEMENTS: UE-H hypercardioid (100 degrees); UE-O omnidirectional (360 degrees)
• ACCESSORY FURNISHED: Soft protective pouch

Audio-Technica U891R Boundary Microphone with Switch Features:

• 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

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