Condenser Boundary Microphones

Condenser Boundary Microphones Condenser Boundary Microphones Condenser Boundary Microphones
Condenser Boundary Microphones
U851
Condenser Boundary Microphones

Overview

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

Features

  • 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
Tech Specs

Technical Specification

SKU U851
Frequency Response 30-20,000 Hz
Impedance Phantom: 200 ohms Battery: 270 ohms
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
Accessories AT8531 power module; battery; soft protective pouch
Element Fixed-charge back plate, permanently polarized condenser
Polar Pattern Half-cardioid (cardioid in hemisphere above mounting surface)
OPTIONAL INTERCHANGEABLE ELEMENTS "H hypercardioid (100°); UE-O omnidirectional (360°)"
LOW FREQUENCY ROLL-OFF 80 Hz, 18 dB/octave
Open Circuit Sensitivity –40 dB (10.0 mV) re 1V at 1 Pa Battery: –41 dB (8.9 mV) re 1V at 1 Pa
Output connector Integral 3-pin XLRM-type
Battery Type 1.5V AA/UM3
Battery Life 0.4 mA / 1200 hours typical (alkaline)
Phantom Power Requirements 11-52V DC, 2 mA typical
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.
Signal to Noise Ratio 72 dB, 1 kHz at 1 Pa
Switches Off, on-flat, on-roll-off
Dynamic Range Phantom: 111 dB,1 kHz at Max SPL Battery: 101 dB, 1 kHz at Max SPL
Dimensions "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"
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