Product Highlights
With superior off-axis rejection and maximum gain-before-feedback, this professional microphone sets audio-quality standards in challenging acoustic environments.
Audio Technica U851a Boundry Mic Audio Technica U851a Boundry Mic
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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.

Key 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 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

What's Included

AT8531 power module
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 Boundry Mic

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