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

  • Overview

    Audio-Technica’s AT-OC9/III MicroCoil™ Cartridge features a special line contact stylus embedded into a low-profile solid boron cantilever, ensuring the music signals read by the tip of the stylus are transmitted reliably to the coils. The cartridge’s “VC mold” design ensures stability and rigidity while the dual moving coil offers excellent stereo separation and improved frequency response for long-lasting performance. The use of PCOCC wire (Pure Copper by Ohno Continuous Casting), a special copper with virtually no transverse crystal barriers to impede signal transmission, perfects the performance of the advanced dual coil design.

  • Features

    • Flagship model with extremely high-quality sound

    • Builds on the characteristics of the critically acclaimed AT-OC9ML/II

    • Special line contact stylus and solid boron cantilever with a 0.26 mm diameter

    • Neodymium magnet and permendur yoke significantly increase magnetic energy

    • PCOCC used for coils and terminal pins

    • Dual moving coil with high separation and wide response

    • VC mold for minimizing unnecessary vibration

    • Rugged body dedicated to achieving a design with increased rigidity

  • Specifications

    Frequency Response 15-50,000 Hz
    Channel Separation 30 dB (at 1 kHz)
    Vertical Tracking Force 1.88-2.2 grams (standard: 2.0 grams)
    Recommended Load Impedance Min. 100 ohms (when head amplifier is connected)
    Output 0.4 mV (at 1 kHz, 5 cm/sec)
    Channel Balance 0.5 dB (at 1 kHz)
    Stylus Shape Line contact
    Cantilever 0.26 mm diameter solid 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)
    AT-OC9/III Manual (pdf 129.25 KB)
  • Reviews

    Superb Cartridge!


    Purchased this cart in July of 2014 and I LOVE LOVE LOVE this cart! Sounds amazing and tracks very well, even with my wide grooved 12" dance singles! Bass is solid and accurate and the eq is on point across the full spectrum. Highs and mids are crisp, yet not harsh. Reproduction is quite accurate using both my Parasound and NAD MC preamps. As a plus, it does not "cut" or "shave" my polystyrene 45's! So great to be able to play them and enjoy the full sound spectrum without worry of wear! (Still suggest manual cueing of those styrene discs!) Highly recommended!

    Los Angeles

    Revealed music on my LP's I never knew was there


    My set is aged but good: Denon DP-62L turntable, NAD 7000 receiver with integrated MM/MC phono preamp, and Klipsch Forte I speakers, all bought new. I noticed even after a stylus change that my Audio Technica AT-160/ML MM cartridge was failing so I replaced it with the OC9/III MC. Very impressed. I played many tracks of great familiarity aurally on the same German pressings from the early 80's for comparative purposes. I thought at first that the pipe organ opening to Your Time is Gonna Come by Led Zep was mushy, maybe owing to less channel separation that the 160, but when I focus I realized that there was music there I had simply never heard before. Richer, lusher, and deeper, particularly in the lower mids and lows, the OC9/III turned many old LP friends into fresh, new acquaintances. The soundstage and presence is open and airy but not brittle or tinny, and though there is background there during times of musical silence, I can sure say that I vastly prefer this to the sterility I find on my CD versions of the same tracks. Very well done Audio Technica - down to keeping the box cartridges come in virtually unchanged in 40 years.

    San Diego


    Excellent cartridge!


    After many years of listening i this unit because of its excellent tacking and fidelity.I have owned cartridges of all types and cost. It has a joy to use.Like hearing new music for first time. I have never heard a better sounding cartridge. Don't change a thing.



    Superb clarity


    In simple words: pleasant to hear with superb clarity and definition with a reasonable price.

    Sao Paulo, Brazil


    The best mc cartridge I currently have. PERIOD.


    Beautiful design, exquisite sound. Is currently the best among my other mc cartridges,denon 103r and Yamaha mc9. After listening to Abdulmajid song in the Philips Glass work over Bowie's Heroes I don't think any other cartridge can sound any better. I'm also a watch collector, so I can notice these small details that indicate a very careful craftmanship. A flawless product that you'll love it. Includes all the hardware.

    Santiago, Chile


    Brings out the subtleties in the music


    I replaced a high end MM cartridge with the AT-OC9/iii. I was expecting more "punch" and better soundstaging, but what has impressed me most about the OC9/iii is the clarity of subtle signals. Very quiet passages with the MM were often audible, but not clear - like they were so soft that you couldn't quite make them out. The same passages with the OC9/iii are not louder, but are now perfectly clear. This effect doesn't just apply to very soft passages, but also to subtleties in tone and how the overall mix between instruments is perceived. Acoustic guitar is especially telling. Where before I would hear the notes, now I hear the fingers on the strings and the character of the instrument beneath the notes.



    Four decibels high, (WAY out of balance) on RIGHT channel


    I am asking for an exchange. Bought from L.P. Tunes, it came with ONE SCREW holding it to the shipping mount. The RIGHT CHANNEL is 4 DB hotter than the left. It is $800 and OUT OF BALANCE.

    Illinois, USA

    AT-OC9/III MicroCoilâ„¢ Cartridge

    4.4 7


  • Q & A

    Hi, i have a AT-LP-7 turntable. Can the AT-OC9/III ne installed on that? Can i use the same tone arm and headshell accommodate this? Also, will the built in phono stage be suitable for this cartridge?


    Yes, you may use the AT-OC9/III with the AT-LP7 and included phono preamp when in the Moving Coil setting.


    Does this come with a head shell? I hate to spend this kind of money and end up mounting it to a generic shell.


    Thank you for your inquiry. No, it does not.


    I have a new Pioneer PLX-1000 Turntable to which I have mounted my old OC/9. The stylus is a bit warn. What would be the best cartridge. Retipping my OC/9, A new OC/9II, OC/9III, an AT150Sa, ot AT150MLx? Thank you.


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


    How does the OC9/III cartridge differ from the ART9 cartridge that is sold in Japan and Europe? Is the ART9 a superior cartridge?


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


    I have a Denon DP-60L turntable with one straight low mass arm and one medium mass S arm. Which will fit best.


    Thank you for your inquiry. Since the OCM/III is a high compliance cartridge, I would think the low mass tonearm would be the one to use.


    Can you tell me what the DC resistance is for the cartridge coils? This will help me to determine the proper load impedance for it. Thanks.


    Thank you for your inquiry. The DC resistance is 12 Ohm.


    I have a very low mass magnepan Unitrac unipivot arm. ? compatibility???


    Thank you for your inquiry. The AT-OC9/III is a high compliance cartridge, so it should work on your low mass tonearm.


    Will this work with my Thorens TD 309? Regards, Sorin


    Thank you for your inquiry. First, your turntable has a 1/2 " mount, so the AT-OC9/III will physically install. Looking at the internet for effective tone arm mass it appears your turntable has a moderate to low mass, so the high compliance AT-OC9/III (31.5) should be fine. One last thing to think about is that moving coil cartridges require receivers or preamps with compatible inputs.


    Will AT-OC9 best and compatible with Rega RP8?


    Thank you for your inquiry. The stock cartridge fro your turntable is a moving coil like the AT-OC9, although I cannot tell about the mount type whether it is a 1/2 inch or something proprietary. You will need to check with the manufacturer to make sure.


    Will this cartridge be compatible with the arm of my Pro-ject RPM 3 Carbon Turntable? Thanks.


    Thank you for your inquiry. Yes it will.