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Omnidirectional Condenser Lavalier 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

    The AT803 provides excellent yet unobtrusive sound pickup for lecturers and stage/TV performers. Designed for clip-on lavalier and musical instrument use, it features an integral 80 Hz high-pass filter that provides easy switching from a flat frequency response to a low-end roll-off. The microphone operates on battery or phantom power.
  • Features

    • High intelligibility for lecturers and stage/TV performers

    • Provides excellent yet unobtrusive sound pickup

    • UniSteep® filter provides a steep low-frequency attenuation to improve sound pickup without affecting voice quality

    • Operates on battery or phantom power

    • 6' (1.8 m) cable permanently attached to mic, TA3F connector at power module

    • RoHS compliant—free from all substances specified in the EU directive on hazardous substances
  • Specifications

    ELEMENTFixed-charge back plate, permanently polarized condenser
    POLAR PATTERNOmnidirectional
    LOW FREQUENCY ROLL-OFF80 Hz, 18 dB/octave
    OPEN CIRCUIT SENSITIVITYPhantom: -44 dB (6.3 mV) re 1V at 1 Pa
    Battery: -46 dB (5.0 mV) re 1V at 1 Pa
    IMPEDANCEPhantom: 200 ohms
    Battery: 270 ohms
    MAXIMUM INPUT SOUND LEVELPhantom: 135 dB SPL, 1 kHz at 1% T.H.D.
    Battery: 121 dB SPL, 1 kHz at 1% T.H.D.
    DYNAMIC RANGE (typical)Phantom: 107 dB, 1 kHz at Max SPL
    Battery: 93 dB, 1 kHz at Max SPL
    SIGNAL-TO-NOISE RATIO66 dB, 1 kHz at 1 Pa
    BATTERY CURRENT / LIFE0.4 mA / 1200 hours typical
    SWITCHOff, on-flat, on-roll-off
    WEIGHT (MICROPHONE)2.8 g (0.1 oz)
    WEIGHT (POWER MODULE)139 g (4.9 oz)
    DIMENSIONS (MICROPHONE)25.0 mm (0.98") long,
    10.2 mm (0.40") diameter
    DIMENSIONS (POWER MODULE)84.0 mm (3.31") H x
    63.0 mm (2.48") W x
    22.0 mm (0.87") D
    CABLE1.8 m (6') long (permanently attached to microphone), 2.6 mm (0.10") diameter, 2-conductor, shielded cable with TA3F-type connector
    ACCESSORIES FURNISHEDAT8531 power module; AT8419 clothing clip; AT8116 windscreen; battery; protective carrying case
    Click on the chart to view the larger image

  • Downloads

    AT803 Specification Sheet (pdf 102.34 KB)
    AT803 Submittal Sheet (pdf 378.90 KB)
    Optional Windscreens / Mounts
  • Reviews

  • Q & A

    Hi all, I'd like to connect AT803 to my smartphone, Galaxy S9. I bought XLR cable for connecting power module and smartphone. I put batteries to power module, turned it on, and connected to smartphone with gender for converting 3 pin to 4 pin. So, it looks like AT803 - power module - xlr - gender - S9. But when I connected it, S9 couldn't recognize the mic input. I also tested on Iphone 7. What is the problem? and how can I solve it? Thanks in advance.

    T Kim

    You may contact your local Audio-Technica offices for further assistance.


    Hello, I am looking for a miniature fur sock suitable for the Lavalier AT803, which one from your list of windscreens is? Thank you,


    You may contact Audio-Technica Europe for further assistance.


    Are these compatible with Sennheiser SK 2000?

    Jim Prentki

    Yes and no. No, the connection will not plug into the other brand wireless transmitter. Yes in the sense you may plug the AT803 into the included AT8531 power module with a battery to provide the necessary bias voltage and then use an XLR to Sennheiser connection.


    Is it possible to adjust de sensibility for a loud environment?


    Thank you for your inquiry. Not on the microphone. You would have to decrease the gain on your input device.


    Can this be hooked into a phone or mobile device for recording purposes?


    Since connections into smartphones are communications ports, plugging a micorphone into them will require the proper adapter and converter. Please contact our Audio Solutions Department at (330) 686-2600 ext 5000 or at for assistance with this.


    Hi, we bought AT803 assuming it is ready to be connected to ZOOM H6 handy recorder. After opening the box I see output connector XLRM type female. From what I understand we need an adaptor XLRM male to XLR male. I cannot find such product. Please advice.


    The AT803 will connect into the body pack. From there, you will run a standard XLR cable (Male-Female) from the body pack into your camera. Make sure your camera has an XLR input as it requires this type of connection. Additionally, this microphone is a condenser and will require Phantom Power in order to operate. Phantom power can be supplied by a battery (by opening the latch on top of the body pack) or by your camera. Contact us directly at for further assistance!


    I'm considering using the AT803 with an Iphone6. Can I purchase and adapter for the 3-pin mini connector to 3.5 MM jack and use the lavalier mic directly this way without the power module or do I have to use the AT8531 Power module and purchase a XLR Female to 3.5 MM jack adapter? I currently use a Zoom recorder with this but need something quick and portable. Many thanks.

    Los Worldwide

    Thank you for your inquiry. You must use the power module with this mic. To connect to the iPhone I suggest using this cable:


    I have an AT803, but need a cardioid mic as well. Is there a cardioid mic (sold separately) that will interface with the power pack for the AT803? Or do I have buy an entirely separate system?


    Please contact our Parts Department at (330) 686-2600 ext 5002 or at for assistance obtaining the correct cardioid element for your microphone.


    Can the AT803 be powered by Zoom H4n? I understand that it should, yet I do not get any signal when the AT803's external power box is turned off. I have ensured that H4n's phantom power is turned on (I've tried both 24v and 48v), and that it is plugged into to a power supply. Recording levels are also turned way up. I'm connecting into the Zoom's XLR input. Everything works fine when the mic's external battery pack is switched on. But I'd rather not rely on that (or even carry it around) if I don't have to. Can you please help? I love the sound and build of these mics but I may have to return them if this can't be corrected.


    You have to use the provided (AT8531) inline Power Module. Like all condenser type element microphones, some amount of power is required to operate the microphone. You may power the microphone by applying phantom power to the module, or by placing the single AA battery into the power module. A power module performs three crucial functions for a condenser type element microphone. When phantom power is applied to it, the module manages phantom power by stepping it down to a much lower bias voltage for the microphone. This bias voltage typically ranges anywhere from 1.1 to 5 volts. The module also balances the signal at its' 3-pin male XLR output connector and determines the output impedance. The switch on the side of the power module can be used to turn the microphone off if needed (whether the mic is being phantom or battery powered). Otherwise it is typically left in either the ON / straight line position (no low roll-off filter engaged) or in the ON / bent line position (low roll-off filter engaged). If you are battery powering your H4n, I recommend installing the battery in the power module to power the microphone. By not using the phantom power on the H4n to power the module, you would be reducing the demand on the battery in the H4n. If you are AC powering the H4n, you can use phantom power if you wish. In demanding (such as high SPL) circumstances it can provide better microphone performance. Leaving the battery installed can provide continued microphone operation in the event phantom power is interrupted for some reason. If phantom power is lost, the battery will take over and power the microphone.


    Is the AT803 compatible with a Sony a77 dslr? I have just received my AT803 and used my xlr cable to adapt it. however it will not work and i tried using a new battery, plugging and unplugging but nothing will work. please help me i have an interview set up for tomorrow!!


    Make certain the switch on the side of the (AT8531) power module is turned ON. This is a 3-position switch. OFF (no sound is produced), ON / STRAIGHT LINE (sound is produced and the low roll-off filter is bypassed) and ON / BENT LINE (sound is produced but the low roll-off filter is engaged and frequencies below 80 Hz are rolled-off at a rate of 18 dB per octave). The Sony AT77 appears to have a stereo MIC IN jack. If you are still not able to get the microphone working, please contact our Audio-Solutions team at (330) 686-2600 extension 5000 or and provide the make and model of the cable that you are using to connect the XLR output of microphones power module to the MIC INPUT jack on the camera.