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Audio-Technica

U851A UniPoint Cardioid Condenser Boundary Microphone

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Overview

Accepts optional elements.

Offering outstanding Audio-Technica sound for surface-mount applications, the U851A UniPoint Boundary Microphone features a PivotPoint rotating output connector, UniSteep filter and UniGuard RFI-shielding technology. This battery or phantom powered condenser microphone accepts interchangeable condenser elements--available for boundary microphones in cardioid, hypercardioid and omnidirectional polar patterns. Its heavy die-cast case and silicon foam bottom pads minimize coupling of surface vibration to the microphone. With superior off-axis rejection and maximum gain-before-feedback, this professional flat microphone sets audio-quality standards in challenging acoustic environments.

Features

  • Designed for surface-mount applications such as high-quality sound reinforcement, professional recording, television, conferencing and other demanding sound pickup situations
  • PivotPoint rotating output connector allows cable to exit from either the rearor 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)
  • UniSteep filter provides a steep low-frequency attenuation to improve sound pickup without affecting voice quality
  • 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 black finish for minimum visibility
  • Operates on battery or phantom power
Specs

U851A UniPoint Cardioid Condenser Boundary Microphone Specifications:

  • Element: Fixed-charge back plate, permanently polarized condenser
  • Polar Pattern: Omnidirectional in hemisphere above mounting surface
  • Frequency Response: 30-20,000 Hz
  • Low Frequency Roll-off: 80 Hz, 18 dB/octave
  • Open Circuit Sensitivity: Phantom ”39 dB (11.2 mV) re 1V at 1 Pa; Battery ”40 dB (10.0 mV) re 1V at 1 Pa
  • Impedance: Phantom 200 ohms; Battery 270
  • Maximum Input Sound Level: Phantom 133 dB, 1 kHz at 1% T.H.D.; Battery 123 dB SPL, 1 kHz at 1% T.H.D.
  • Dynamic Range (Typical): Phantom 111 dB, 1 kHz at Max SPL; Battery 101 dB, 1 kHz at Max SPL
  • Signal-To-Noise Ratio: 72 dB, 1 kHz at 1 Pa
  • Phantom Power Requirements: 11-52V DC, 2 mA typical
  • Optional Interchangeable Elements: UE-H hypercardioid (100); UE-O omnidirectional (360)
  • Battery Type: 1.5V AA/UM3
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