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Dual Moving MicroCoil™ Cartridge

U.S. One-Year Limited End-User Warranty

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

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

  • Overview

    Moving coil cartridge with MicroLine® diamond tip, for the best in clarity, transparency, precise stereo imaging, lower distortion and even wear for extended vinyl and stylus life. A-T Vector-Aligned design, with two moving coils mounted at 90 degrees in place of the two moving magnets.

  • Specifications

    Frequency Response 15-50,000 Hz
    Channel Separation 31/21 (dB at 1 kHz/10 kHz)
    Vertical Tracking Force 1.25-1.75 grams
    Stylus Construction Nude square shank
    Recommended Load Impedance 20 ohms
    Output 0.4 (mV at 1 kHz, 5 cm/sec)
    Channel Balance 1.0 dB
    Stylus Shape MicroLine®
    Cantilever Gold-plated boron
    Mount Half-inch

    Note: Moving coil cartridges require receivers or preamps with compatible inputs; their stylus assemblies are not field-replaceable.

  • Downloads

    A Guide to Phono Cartridges (pdf 669.29 KB)
  • Reviews

    One of the best, price no object


    I listen primarily to rock and classical music and searched for a cartridge which sounds alive and engaging and can track all of them from start to finish beautifully. Very dynamic and resolving and clear without sounding etched or fatiguing. The AT-OC9/MLII is a giant killer! It outperforms and out tracks cartridges 2-4 times as much (I know this because I own them too and don't like as much as the OC9/MLII)! I use it on a Goldmund Studio turntable and T-3F servo linear tracking tonearm. Its use of the MicroLine stylus is critical to its performance. I wish the higher end A-T cartridges also featured the MicroLine stylus instead of the inferior line contact profile which has poorer high frequency performance and distortion, especially on inner grooves. Audio-Technica management: I hope you are reading this (hint, hint).

    Los Angeles, CA


    Superb cartridge


    My dad raised me on stereo from day one. I remember him going through AT, Shure, and Stanton cartridges back in the '80s. Back then we both agreed that AT had the sound and light tracking force we wanted. After a 2-decade vinyl vacation I brought it back. The AT440MLA on my Technics SL-1210M5G reminded me of the sweet sound that started my audio journey. Because my preamp has MC ability I also tried the Denon 103R. None of this prepared me for the OC9/II. I knew it was special from the first needle drop. While I like both the 440 and the 103R, the OC9 just takes it to a new dimension. The soundstage- the ability to hear individual instruments in their own space is one thing the OC9 completely walks away from the other two on. The highs are sweet but not overdone, the bass is balanced, and the mids are liquid. While I stand by the 440MLA and 103R as excellent values, they just don't compare to OC9/II. If you can afford it, do it. Highly recommended.

    Houston, TX


    This cartridge exhibits noticeably superior performance and


    I have used Audio-Technia phonograph cartridges for well over 15 years. Prior to that time I used several competing brands of cartridges, but never experienced the performance of Audio-Technica products. I am currently using the AT-OC9ML/II and am very pleased with the performance of this very fine product. I am a long retired electrical engineer/audiophile and appreciate the superior technical characteristics, and the audio quality produced by this cartridge, compared with competing cartridges of similar design, is unmistakably superior.

    San Antonio, TX, USA

    AT-OC9ML/II Dual Moving MicroCoilâ„¢ Cartridge

    5.0 3


  • Q & A

    Will this work om a AT-LP 120 USB thurntable? Thank you, Sid


    It is not recommended to use a moving coil cartridge with the AT-LP120-USB turntable.


    is it suitable for the AT-OC9ML/II with tracking force 1.25 - 1.76 gm to be fixed with rega rp8 tornearm rb808?

    Ariffin AR

    You may contact Audio-Technica Malaysia for further assistance.




    It appears the listed turntable will allow for medium mass cartridges which is what the AT-OC9ML/II is. Being a moving coil cartridge, you will need a specific phono preamp that will allow for MC cartridges and you will want to verify with your turntable manufacturer that their turntable and tone arm may be used with moving coil cartridges.


    What is the compliance and the weight of the cartridge? Also, I assume by the given vtf range that the optimum vtf would be 1.5 grams. Is that right? Thanks.


    Thank you for your inquiry. The dynamic compliance is 18 at 100 Hz. The vertical tracking force is a range of 1.25-1.75 grams.


    Hello, Would this cartridge work well with the Expressive Technologies SU-1 step up transformer? (It's input impedance is set at 75R.) Or would a less refined, but 20R input impedance step up unit work better with it? Thank you.

    ET SU-1

    The 20 ohm SUT would be a better fit.




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


    What is your re-tipping or exchange policy for the AT-OC9ML/II? How many hours of usage do you recommend till re-tip or exchange? Fred


    Please contact our Service Department at (330) 686-2600 ext 5009 or at for assistance with this.


    Please mail me the settings of AT OC9ML II for my iFi micro iPhono2 phono-pre amp. best regards, Josef Koch


    Thank you for your inquiry. Are you referring to which EQ curve to use on the iPhono2? You will want to use RIAA. If this does not answer your question please contact our Audio Solutions Department at (330) 686-2600 ext 5000 or at for assistance with this.


    What is the DC resistance of the coils in the AT-OC9ML/II cartridge?


    11 ohms


    What load impedance is preferred when using with a Step-up transformer? Thx, Jeff


    20 ohms