Cardioid Condenser Boundary Microphone with Switch

$579 + shipping (includes gst)

Designed to deliver easy, flexible control in conference and boardroom installations, the versatile U891Rx 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 (U891Rx) and white (U891RWx)

Fixed-charge back plate, permanently polarized condenser

Polar Pattern

(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


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


Activation: on/off; 
Switch function: press on/off, 
momentary on, momentary off; 
Flat, roll-off


264 g (9.3 oz)


108.0 mm (4.25″) maximum length, 
84.0 mm (3.31″) maximum width, 
23.0 mm (0.91″) maximum height

Output Connector


Optional Interchangeable Elements

UE-O omnidirectional (360°) 
UE-H hypercardioid (100°)

Polar Pattern
Frequency Response
U891Rx/Wx Submittal Sheet (PDF) Download
U891Rx/Wx Spec Sheet (PDF) Download

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