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SonicFuel® In-ear Headphones with In-line Mic & Control

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

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

  • in ear headphones
  • audio headphones
  • headphones with mic
  • headphones with microphone
  • audio headphones for smartphones
  • in ear headphone accessories
  • case for headphones with mic

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

  • Overview

    Music is your energy for life – the fuel for your heart and soul. SonicFuel® headphones are specifically designed for active, daily use, to power you forward by delivering extraordinary comfort, style and an immersive listening experience that never sounds artificial, processed or filtered. Just pure sonic goodness for the high-octane tempo of your life.

    The ATH-CKX9iS SonicFuel® in-ear headphones feature stay-in-place fit, providing unique comfort in addition to optimal sound. The C-tip configuration nestles within the ear where it locks in place for extra stability. Customize your comfort with a multitude of C-tip & silicone eartip sizes or use the included Comply™ foam eartips for true sonic immersion.

    Large 13.5 mm performance-enhanced drivers fuel your day with a premium listening experience, deeper bass response and sparkling high frequencies.

    In-line volume and microphone controls (on compatible smartphones) allow you to control music & phone calls without missing a beat. A newly designed flat cable eliminates annoying tangles and lasts longer. The included hard carrying case keeps your headphones protected and organized, so they are easy to find and unravel every time.
  • Features

    • Large 13.5 mm performance enhanced drivers offer a premium listening experience

    • C-tip design fits the shape of your ear for reliable stay-in-place comfort

    • In- line control with mic for answering/ending calls, controlling music & video playback, and controlling volume (on compatible smartphones & other portable devices)

    • Included luxury zippered hard carrying keeps headphones protected and easy to find every time

    • Also includes Comply™ foam tips, silicone eartips (XS/S/M/L), C-tips (S/M/L), and tangle-free flat cable

    • Available in black (BK) and silver (SV)

  • Specifications

    Driver Diameter13.5 mm
    Frequency Response5 - 25,000 Hz
    Maximum Input Power20 mW
    Sensitivity104 dB/mW
    Impedance32 ohms
    Weight10 g (without cord)
    Cable1.2 m (3.9'), Y-type
    Connector3.5 mm (1/8") gold-plated stereo 4-pin mini-plug, L-type
    Accessories IncludedHard carrying case, Comply™ foam eartip (M), silicone eartips (XS/S/M/L), C-tips (S/M/L)
    Type (Microphone)Condenser
    Sensitivity (Microphone)-44 dB (0 dB=1 V/Pa, 1 kHz)
    Frequency Response (Microphone)100 - 10,000 Hz
    Polar Pattern (Microphone)Omnidirectional

  • Reviews

    Ergonomically useless


    The profile of these is just not good. They stick out of the ear too much and make thumping sounds as you walk. Incompatible with hats and headbands. Not a good in-ear headphone experience at all.



    Love these!


    Love these headphones. They travel well, have great sound and have lasted me two years and are still in great shape. I really like ease of the mic unit and the ability to adjust volume from it. Great sound for a great price.

    Philadelphia, PA


    Great potential but something not right.


    I purchased the ATH-CKX9iS back in January 2014 on the reputation of the M50. Had them for about a week before a static/cracking of the audio began when the jack would move around. Just normal swivel?That later turn into a consistent audio cracking when adjusting the volume the built-in volume control. I did send them in for a warranty replacement and got a second pair with great response. Three weeks into the second pair and now the left the phone?s audio has diminished to a faint sound. Very disappointing? Prior to buying these I had a competitor pair of headphones that provided me 3 great years of awesome sound and reliability. They eventually gave into the many hours of use and abuse of airport travel, exercise and lawn work. These were to be the replacement. Can?t say that I hate these headphones as the c-tip design, which I was hesitant on initially, works out great for staying in the ear. That was my only complaint to my previous headphones, they were not great for working out or moving around a lot. However, they did provide the most basic and critical feature?sound quality with great noise isolation. The CKX9iS do not do as great of a job of isolating outside noise which is OK when you can turn up the volume to compensate. I will attempt to get a third pair but maybe I will opt to get the 9i vs. the 9iS as I think the issue is with built-in Mic and volume control.

    Greensboro, NC, USA

    Excellent product


    Received a pair and was blown away by how clear and true the sound is. I own the over the ear beats by dre and these completely blow them out of the water. I listened to the same song on both headphones and by far the ckx9is won without a doubt. I find myself listening to the songs I have listened to before only to hear new things I haven't before. Comfortability is good. I had these of for 7 hours straight without and discomfort. The mic worked perfectly and everyone could hear me fine on the other end. The seal these headphones deliver is great. I had them on riding in a semi and the seal was good enough that I could listen to my Ipod at 60% and not be bothered by the engine. I would assume then they would be good for usage on a plane. I use these every day about an hour or so and have had used them over 40 hours. In my experience I noticed a slightly better sound after 4 hours of use. Your experience might differ. I was looking for a pair of headphones at $100 and I couldn't be happier. After listening to these I don't think I would ever buy another brand of headphones as the quality, sound, looks, and basically everything exceeded my expectations.

    Illinois, USA

    ATH-CKX9iS SonicFuel® In-ear Headphones with In-line Mic & Control

    3.3 4


  • Q & A

    Where along the cord is the microphone located? How many inches from the earpiece? Is it at chin-level?


    Thank you for your inquiry. It is 14 inches from the earphone.


    I have a ATH-CKX9iS ear phone. For which the jack which connects to the mobile is broken. Can I get "1.2m Y-typecord and 3.5mm gold-plated stereo 4-pin mini-plug (L-shaped)" parts?


    Thank you for your inquiry. Please contact our Parts Department at 330-686-2600 ext. 5002. They would be happy to help you.


    Does this support Android devices. I have a Nexus 5X so can I use with it, without compromising any quality or functionality?


    Thanks for your inquiry. The ATH-CKX9iS is compatible with all mobile device as long as the device has a 3.5mm headphone jack input.

    Does the volume controls work for Iphone 6?


    Yes, the ATH-CKX9iS utilize the iOS protocol for controls.


    When the specifications state that the in-line mic can "control music" does that mean you can use the same hidden controls that you can with the apple ones such as: tap the center button twice to fast-forward a song, tap the center button three times and long-press on the third tap to rewind a song, etc.


    Thank you for your inquiry. Yes it controls your music the same as the apple ones.


    are the ATH AKX 9 in ear earphones water resistant?


    The ATH-CKX9iS are not rated for any water resistance. If you have any further questions, please contact the Audio-Technica United States (ATUS) Audio Solutions Team at: Thanks!


    does this headphone not work with Motorola droid turbo as every time I have to connect the headphone via a headphone amplifier for it to work otherwise it doesn't work at all.


    To provide you with the best possible answer/support, please contact the Audio-Technica division for your world area:

    Will the mic on these work on a Xbox one?


    If your XBOX One Controller has a 3.5mm CTIA headset connection, then the ATH-CKX9iS should work. If your XBOX One Controller does NOT have a 3.5mm CTIA headset connection, then you would need to purchase the "XBox One Stereo Headset Adapter" from Microsoft. Before using the Headset Adapter, your controller will need to be updated according to the instructions provided by Microsoft. If you have questions on how to update your controller, please contact Microsoft XBOX Support. In either scenario, a more ideal product to use would be an Audio-Technica Gaming Headset. If you have any further questions, please contact the Audio-Technica United States (ATUS) Audio Solutions Team at: Thanks!


    How do i put on the ear buds?


    You will find helpful information here:


    Can i get the ear foam that on the right? I really want to get that foam. But i couldn't find anywhere :(. Please, let me know if you i can buy it..!!!


    Please contact our Parts Department at (330) 686-2600 ext 5002 or at for assistance with this.