Product Highlights
Offering outstanding Audio-Technica sound for surface-mount applications, the U851A features a PivotPoint® rotating output connector, UniSteep® filter and UniGuard® RFI-shielding technology.
Audio Technica U851A Cardioid Condenser Boundary Microphone Audio Technica U851A Cardioid Condenser Bound...
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Overview

Offering outstanding Audio-Technica sound for surface-mount applications, the U851A 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 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 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)
  • 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 silicone 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

What's Included

  • Audio-Technica UA851A UniPoint Boundary Microphone
  • AT8531 Power Supply
  • AA Battery
  • Soft Protective Pouch

Reviews

Product 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 Phantom: –40 dB (10.0 mV) re 1V at 1 Pa
Battery: –41 dB (8.9 mV) re 1V at 1 Pa
IMPEDANCE Phantom: 200 ohms
Battery: 270 ohms
MAXIMUM INPUT SOUND LEVEL Phantom: 133 dB SPL, 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
BATTERY TYPE 1.5V AA/UM3
BATTERY CURRENT / LIFE 0.4 mA / 1200 hours typical (alkaline)
SWITCH Off, on-flat, on-roll-off
WEIGHT (MICROPHONE) 8.6 oz (244 g)
WEIGHT (POWER MODULE) 4.9 oz (139 g)
DIMENSIONS (MICROPHONE) 4.25" (108.0 mm) long,
3.31" (84.0 mm) maximum width,
0.91" (23.0 mm) height
DIMENSIONS (POWER MODULE) 3.31" (84.0 mm) H x
2.48" (63.0 mm) W x
0.87" (22.0 mm) D
OUTPUT CONNECTOR (POWER MODULE) Integral 3-pin XLRM-type
CABLE 25.0' (7.6 m) long (permanently attached to microphone), 0.13" (3.2 mm) diameter, 2-conductor, shielded cable with TA3F-type connector
OPTIONAL INTERCHANGEABLE ELEMENTS UE-H hypercardioid (100°);
UE-O omnidirectional (360°)
ACCESSORIES FURNISHED AT8531 power module; battery; soft protective pouch

 

Questions & Answers

Audio Technica U851A Cardioid Condenser Boundary Microphone

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