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Cardioid Condenser Microphone

U.S. Five-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

    Ideal for professional recording and critical applications in broadcast, this versatile studio performer may be used with confidence in a wide variety of professional miking applications. Featuring direct-coupled balanced outputs for clean signals in high-output conditions, the microphone is totally free of the distortion associated with conventional transformer-coupled outputs. Its fast response to transients contributes to the open, transparent reproduction of even the most difficult-to-capture instruments. The microphone is fully RoHS-compliant – free from all substances specified in the EU directive on the reduction of hazardous substances (RoHS).

    The AT4051b consists of two modular subassemblies: an AT4900b-48 body and an AT4051b-EL cardioid head capsule (both available separately). Additional interchangeable capsules are available in omnidirectional (AT4049b-EL) and hypercardioid (AT4053b-EL).
  • Features

    • Specially engineered to meet the most critical acoustic requirements of professional recording, broadcast and sound reinforcement

    • High front-to-back rejection ratio—cardioid polar pattern improves isolation of desired sound source

    • Direct-coupled, balanced output results in a clean signal even under high-output conditions

    • Transformerless circuitry virtually eliminates low-frequency distortion and provides superior correlation of high-speed transients

    • Switchable 80 Hz hi-pass filter and 10 dB pad

    • Rugged turned-brass microphone housing for enduring dependability

    • State-of-the-art design and manufacturing techniques ensure compliance with A-T’s stringent consistency and reliability standards

    • RoHS-compliant – free from all substances specified in the EU directive on the reduction of hazardous substances (RoHS)

  • Specifications

    ELEMENTExternally polarized (DC bias) capacitor
    LOW FREQUENCY ROLL-OFF80 Hz, 18 dB/octave
    OPEN CIRCUIT SENSITIVITY-34 dB (19.9 mV) re 1V at 1 Pa
    IMPEDANCE50 ohms
    MAXIMUM INPUT SOUND LEVEL145 dB SPL, 1 kHz at 1% T.H.D.;
    155 dB SPL, with 10 dB pad (nominal)
    NOISE16 dB SPL
    DYNAMIC RANGE (typical)129 dB, 1 kHz at Max SPL
    SIGNAL-TO-NOISE RATIO78 dB, 1 kHz at 1 Pa
    SWITCHFlat, roll-off; 10 dB pad (nominal)
    WEIGHT126 g (4.4 oz)
    DIMENSIONS155.0 mm (6.10") long,
    21.0 mm (0.83") maximum body diameter
    OUTPUT CONNECTORIntegral 3-pin XLRM-type
    AT4053b-EL (hypercardioid)
    ACCESSORIES FURNISHEDAT8405a stand clamp for 5/8"-27 threaded stands; windscreen; protective carrying case
    Click on the chart to view the larger image

  • Downloads

    AT4051b Specification Sheet (pdf 325.43 KB)
    AT4051b Submittal Sheet (pdf 189.50 KB)
    Optional Windscreens / Mounts
  • Reviews

  • Q & A

    Do you have questions about this product?

    Get answers from real customers and in-house experts with AnswerBox.

    4 Questions | 4 Answers
    Displaying questions 1-4
    • Q:

      Audio-Technica AT4051B Cardioid Condenser Microphone
      Does this go straight into my computer, or my camera? I'm using a Canon 60D and want it to go into my camera so that I don't have sync the audio in post. If I do this does that hurt the quality.
      Is this all I need or is there more I need to make it work?
      Asked on 12/27/2015 by Ryan from Louisville, KY

      1 answer

      • Staff Reviewer


        Please contact our Audio Solutions Department at (330) 686-2600 ext 5000 or at for assistance with this.

        Answered on 12/31/2015 by ATUS_Specialist3
    • Q:

      Power supply compatibility

      Are the new 4051b (and 4053b & 4049b) capsules fully compatible with older AT4900a power supplies/bodies?

      I know they fit together, but are there any design differences that would affect the sound of the capsules?
      Asked on 8/5/2013 by AdmNaismith from North Hollywood, Los Angeles, CA, USA

      1 answer

      • A:

        The (old) AT4900a is compatible with the following (new) elements:
        • AT4049b-EL – Omnidirectional Element
        • AT4051b-EL – Cardioid Element
        • AT4053b-EL – Hypercardioid Element
        The polarization voltage is the same for the both versions. (about 50 V)

        If you would like to use the old AT4900a (microphone body) with new capsules, the performance will be same as the old versions.

        The older capsules are compatible with the newer body (AT4900b) as well. If you use the new AT4900b with old capsules, the Pad values will be:
        • AT4051a + AT4900b = -17 dB
        • AT4049a + AT4900b = -15 dB
        • AT4053a + AT4900b = -17 dB

        This is because capacitance is difference between new and old capsules.

        Any of these elements can be ordered by an Authorized Audio-Technica dealer. There is a dealer locator on our homepage,


        Answered on 8/6/2013 by AudioSolutionsSpec2 from Stow, OH
    • Q:

      Mic clip/mount for 4051

      I have a pair of 4051 mics but I have lost one of the mic clips/mounts. Which of your accessory mic clips/mounts would fit the 4051 and can I purchase one from you? I haven't been able to find anywhere else to buy one.
      Asked on 10/15/2012 by Jamo

      1 answer

      • A:

        The stand clamp for the AT4051a Microphone is the AT8405a

        Answered on 10/16/2012 by AudioSolutionsSpec1 from Stow,OH
    • Q:

      Microphone matching

      Does your company offer mic matching for the 4051b?
      Asked on 9/15/2011 by Skip from N. Bethesda MD

      1 answer

      • A:

        Thank you for your inquiry. I assume that you are asking if we sell the AT4051b as a matched pair (consecutive serial numbers). We do not because it not necessary. Our 40 series microphones are held to such close specs during the quality assurance process that they are all virtually matched pairs. Having microphones with consecutive serial numbers does not guarantee their specs are identical. Only measuring their performance does.

        Answered on 9/15/2011 by AudioSolutionsManager from Stow, OH
    Displaying questions 1-4

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