U851A

Cardioid Condenser Boundary Microphone

MSRP* US$350.00
Two-Year Limited End-User Warranty

*Manufacturer's Suggested Retail Price. Actual selling price may vary; please check with an authorized Audio-Technica dealer.



  • Overview
  • Features
  • Specifications
  • Downloads
  • Reviews
  • Q & A

  • 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

  • Specifications

    ELEMENTFixed-charge back plate, permanently polarized condenser
    POLAR PATTERNHalf-cardioid
    (cardioid in hemisphere above mounting surface)
    FREQUENCY RESPONSE30-20,000 Hz
    LOW FREQUENCY ROLL-OFF80 Hz, 18 dB/octave
    OPEN CIRCUIT SENSITIVITYPhantom: –40 dB (10.0 mV) re 1V at 1 Pa
    Battery: –41 dB (8.9 mV) re 1V at 1 Pa
    IMPEDANCEPhantom: 200 ohms
    Battery: 270 ohms
    MAXIMUM INPUT SOUND LEVELPhantom: 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 RATIO72 dB, 1 kHz at 1 Pa
    PHANTOM POWER REQUIREMENTS11-52V DC, 2 mA typical
    BATTERY TYPE1.5V AA/UM3
    BATTERY CURRENT / LIFE0.4 mA / 1200 hours typical (alkaline)
    SWITCHOff, 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
    CABLE25.0' (7.6 m) long (permanently attached to microphone), 0.13" (3.2 mm) diameter, 2-conductor, shielded cable with TA3F-type connector
    OPTIONAL INTERCHANGEABLE ELEMENTSUE-H hypercardioid (100°);
    UE-O omnidirectional (360°)
    ACCESSORIES FURNISHEDAT8531 power module; battery; soft protective pouch
    Click on the chart to view the larger image
    POLAR PATTERN
    POLAR PATTERN
    FREQUENCY RESPONSE
    FREQUENCY RESPONSE



    Conditions
  • Downloads

    UniPoint Review - Sound & Video Contractor (pdf 128.21 KB)
    UniPoint Review - Pro Audio Review (pdf 238.70 KB)
    U851A Specification Sheet (pdf 330.95 KB)
    U851A Submittal Sheet (pdf 512.47 KB)
    Optional Windscreens / Mounts
  • Reviews

  • Q & A

    (1 Question : 1 Answer)

    Product Q&A

    Ask your questions. Share your answers.

     
     
    « Back
     
     
    Has staff answer
     
    1 answer

    Can I put a regular XLR connector on it

    U851A Cardioid Condenser Boundary Microphone
    Age: 55-65
    User Type: Other
    Experience: Pro
    2 years, 7 months ago
    Customer avatar
    by
    Montreal, QC, Canada
    Read all my Q&A
     
    Please wait while more information about Michel is loaded.
    Additional information about Michel could not be loaded.
    +1point
    1out of 1found this question helpful.
    Was this helpful?helpful1unhelpful0

    Answers

    Answer: 
    Thank you for your inquiry. No, you must use the power module. The power module attached to some condenser microphones provides several important functions. First, it converts the 11 – 52 VDC phantom power into a smaller DC bias voltage used to power the FET impedance matching circuit inside the microphone. Also, it provides low frequency roll off, supplies battery power if phantom power is not available, converts the signal to the proper impedance and balances the output. The power module is a necessary component.

    Please note this mic is available as a phontom power only version that has just an XLR connector (U851R).
    Age: 45-54
    Experience: Pro
    2 years, 7 months ago
    Customer avatar
    by
    Stow, OH
    Read all my Q&A
     
    Please wait while more information about AudioSolutionsManager is loaded.
    Additional information about AudioSolutionsManager could not be loaded.
    0points
    0out of 0found this answer helpful.
    Was this helpful?helpful0unhelpful0
    1 of 1
    1 of 1