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Three-Element Multidirectional Boundary Microphone

U.S. Two-Year Limited End-User Warranty

*Manufacturer's Suggested Retail Price. Actual selling price may vary; please check with an authorized Audio-Technica dealer.

  • Boundary Microphone
  • Surface Microphone
  • Multidirectional Mic

  • Overview
  • Features
  • Specifications
  • Downloads

  • Overview

    With three cardioid condenser elements in a single housing, the phantom-powered U843R offers a remarkably versatile tool for surface-mount installations. It is ideal for a variety of video and audio conferencing applications, especially when used with an Audio-Technica automatic SmartMixer®. Levers on the microphone base allow easy reorientation of two elements to offer 360° or 300° coverage. Since elements can be powered and used individually or in any combination, further flexibility is easily achieved. For example, with two elements powered, the microphone can provide a figure-of-eight polar pattern; with a single element powered, the microphone functions as a standard cardioid boundary microphone. Installation and repositioning are extremely quick, thanks to four recessed pathways on the base of the microphone that enable the user to route the cable as required to accommodate any installation requirements; no tools or disassembly are needed. The microphone also offers Audio-Technica’s innovative UniGuard® RFI-shielding technology.
  • Features

    • Three cardioid condenser elements mounted in a single housing

    • Easily reposition two elements (via levers on the microphone base) to offer 360° or 300° coverage; each element can be powered and used individually or in any combination

    • Also functions as a stereo boundary microphone

    • Provides full, efficient and flexible coverage – fewer microphones required

    • Small-diameter capsules near boundary eliminate phase distortion and deliver clear, high-output performance

    • Low-frequency attenuation improves sound pickup without affecting voice quality

    • Cable routes through any of four recessed pathways on the microphone base (or down for direct feed through a table surface); no tools or disassembly required

    • UniGuard® RFI-shielding technology offers outstanding rejection of radio frequency interference (RFI)

    • Heavy die-cast case and non-slip silicone foam bottom pad minimizes coupling of surface vibration to the microphone

    • Low-profile design with low-reflectance finish for minimum visibility

    • U843R is ideal for a variety of video and audio conferencing applications, especially when used with an Audio-Technica automatic SmartMixer®

  • Specifications

    ELEMENTFixed-charge back plate, permanently polarized condenser
    POLAR PATTERNCardioid x 3
    LOW FREQUENCY ROLL-OFF80 Hz, 18 dB/octave
    OPEN CIRCUIT SENSITIVITY-37 dB (14.1 mV) re 1V at 1 Pa
    IMPEDANCE100 ohms
    DYNAMIC RANGE (typical)105 dB, 1 kHz at Max SPL
    SIGNAL-TO-NOISE RATIO65 dB, 1 kHz at 1 Pa
    WEIGHT160 g (5.6 oz)
    DIMENSIONS (MICROPHONE)85.0 mm (3.35") diameter, 20.0 mm (0.79") height
    OUTPUT CONNECTORUnterminated – stripped and tinned
    CABLE7.6 m (24.93') long, Unterminated-type, Permanently attached to microphone
    ACCESSORY FURNISHEDSoft protective pouch

    Architect’s and Engineer’s Specifications

    The microphone shall be a three-element multidirectional fixed-charge condenser designed for use in surface-mount applications. It shall have three cardioid elements (cardioid in hemisphere above mounting surface) and a frequency response of 75 Hz to 15,000 Hz. The microphone shall operate from an external 11V to 52V DC phantom power source. It shall be capable of handling sound input levels up to 134 dB with a dynamic range of 105 dB. Nominal open-circuit output voltage shall be 14.1 mV at 1V, 1 Pascal. Output shall be low impedance balanced (100 ohms). It shall offer outstanding rejection of radio frequency interference (RFI).

    The microphone shall include two positioning levers to permit angles of 90°/90°/180° between elements or 120° between elements; this flexibility shall permit change of the microphone’s coverage area with no tools or disassembly required. The microphone shall incorporate self-contained electronics, eliminating the need for an external power module. The microphone shall have a permanently attached 7.6 m (25') miniature cable. The output end of the cable shall have stripped and tinned color-coded leads for connections. The microphone shall offer cable-routing recessed pathways on its base to accommodate installation requirements without the need to disassemble the microphone or use tools to change the cable exit location.

    The microphone shall have a diameter of 85.0 mm (3.35") and a height of 20.0 mm (0.79"). Weight shall be 160 grams (5.6 oz). The microphone shall be housed in a die-cast case with a perforated steel grille. Finish shall be low-reflectance black. The microphone shall include a soft protective pouch.

    The Audio-Technica U843R is specified.

  • Downloads

    U843R User Manual (pdf 562.85 KB)
    U843R Quick Start Guide (pdf 1.08 M)