Audio-Technica U851A Cardioid Condenser Boundary Microphone

ITEM #: U851A MFG #: U851A

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U851A - 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.

Did You Know?
While boundary mics are widely utilized in conference rooms and training applications, many audio engineers use them as drum recording mics. It's true! Musicians and audio engineers can benefit from a pair of boundary mics by placing them on the floor on both sides of a kick drum, on the walls or even inside the kick drum. Have fun experimenting to find your killer drum sound.

  • 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
     
  • Specifications:

    • Element: Fixed-charge back plate, permanently polarized condenser
    • Polar Pattern: Half-cardioid, (cardioid in hemisphere above mounting surface)
    • Frequency Response: 30 - 20,000Hz
    • Low Frequency Roll-Off: 80Hz, 18dB/octave
    • Open Circuit Sensitivity: Phantom: -40dB (10.0mV) re 1V @ 1Pa; Battery: -41dB (8.9mV) re 1V @ 1Pa
    • Impedance: Phantom: 200Ω Battery: 270Ω
    • Maximum Input Sound Level: Phantom: 133dB SPL, 1kHz @ 1% T.H.D.; Battery: 123dB SPL, 1kHz @ 1% T.H.D.
    • Dynamic Range (typical): Phantom: 111dB,1kHz @ Max SPL; Battery: 101dB, 1kHz @ Max SPL
    • Signal-To-Noise Ratio: 72dB, 1kHz @ 1Pa
    • Phantom Power Requirements: 11 - 52V DC, 2mA typical
    • Battery Type: 1.5V AA/UM3
    • Battery Current/Life: 0.4mA/1200 hours typical (alkaline)
    • Switch: Off, on-flat, on-roll-off
    • Weight (Microphone): 8.6oz
    • Weight (Power Module): 4.9oz
    • Dimensions (Microphone): 4.25" long, 3.31" maximum width, 0.91" height
    • Dimensions (Power Module): 3.31" H x 2.48" W x 0.87" D
    • Output Connector (Power Module): Integral 3-pin XLRM-type
    • Cable: 25.0ft long (permanently attached to microphone), 0.13" diameter, 2-conductor, shielded cable with TA3F-type connector
    • Optional Interchangeable Elements: UE-H hypercardioid (100°); UE-O omnidirectional (360°)
     
  • Item Includes:

    • AT8531 power module
    • Battery
    • Soft protective pouch
     
  • Warranty:

    • 2 Year Limited End-User
     
  • GTIN:

    0042005139132
     

California Residents:
WARNING:
Cancer and Reproductive Harm - www.P65Warnings.ca.gov