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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.

  • active headphones

  • 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-CKX5iS 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. A 360˚ rotating eartip adjusts to the unique angle of your ear canal for personalized fit and improved sound isolation.

    In-line volume and microphone controls (on compatible smartphones) allow you to control music & phone calls without missing a beat.
  • Features

    • 360° rotating eartip adjusts to the unique angle of your ear canal for personalized fit and better sound isolation

    • 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)

    • Crisp, accurate audio reproduction

    • Includes carrying pouch, eartips (XS/S/M/L), C-tips (S/M/L)

    • Available in black (BK), blue (BL), red (RD), and white (WH)

  • Specifications

    Driver Diameter8 mm
    Frequency Response15 - 22,000 Hz
    Maximum Input Power40 mW
    Sensitivity100 dB/mW
    Impedance16 ohms
    Weight10 g (without cord)
    Cable1.2 m, Y-type
    Connector3.5 mm gold-plated stereo 4-pin mini-plug, L-type
    Accessories IncludedCarrying pouch, 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

    These are THE BEST headphones


    I have gone through SO many pairs of earphones in this price range. I use earphones a lot - from everyday activities, to the gym, and traveling, and these are THE best I've found so far not only in this range but even at higher prices. Specifically, these are better than a pair of $150 Sol Republics I had. Also, I'm not an ear bud wearer as those things fall out of my ears constantly and the squishy buds irritate my ear canal. I have none of those problems with these. I plan to buy more when I finally wear these out / or even try the higher priced version. If they are even better than these they will really be worth it!!

    San Diego, CA

    Broke After a Month


    I bought these headphones and wore them periodically for a month. I had only had them for 28 days and the right ear bud went completely quiet. I really want to think AT is a quality brand but this was a really poor first experience!




    Amazing headphones lasted me so long. These headphones went through the wash and came out perfectly fine but after a half year the sound went down and played loudly out of the right on




    These earphones are amazing, with great quality basses and trebles, I've had a great time using these headphones for basically all my needs. When I first bought these earphones I heard a slight annoying rubbing noise coming from the left ear. I just pushed that aside and continued usage. After a month the left side just stopped working completely. I haven't done anything to this earphones, in which the left side would have broke. I have only used these earphones for casual musical use, which met my expectations. I believe I should have gotten, better quality earphone for the price I paid. Also at this price I would expect a warranty. I was very annoyed after my left ear bud stopped working, Making my usual usage go down to barely 30 minutes.

    Ellicott City, MD, USA

    Awesome sound! Great fit!


    I use these for working out. They are incredible. They never fall out because I customized the fit to my ears. And the sound is incredible!


    Poor Initial Quality


    Upon receipt the volume slider was not functioning as designed. After many attempts I finally got it replaced with a new set. The volume control works fine.A bit fussy on selecting the proper ear hook and bud, but once selected, they fit well. Not enough experience, yet, running, to see how well they stay in. Time will tell! Nice sound, but not for an audio purist.

    Uniontown, OH

    ATH-CKX5iS SonicFuelâ„¢ In-ear Headphones with In-line Mic & Control

    3.2 6


  • Q & A

    Will the microphone and in-line controls work with iPhone 6s?


    Yes, the ATH-CKX5iS include inline microphone and controls for smartphones and iOS devices.


    Will the volume slider and button work with apple devices? (iphone, macbook etc)


    Thank you for your inquiry. The volume control is a mechanical attenuator and can be used on any device. The button control will work with iOS (iPhone, iPad, iPod, etc) and not with standard Mac OS.


    Do these have android compatibility?


    Yes they do. Our "iS" models use the CTIA protocol (an international standard).


    Android compatibility Which of the controls are fully compatible with android phones (especially with Galaxy S3)?


    Since you are located in The United Kingdom, please contact the A-T division for your world-area, Audio-Technica UK. - Thanks!


    ATH- CKX5i S When will these be available?


    Thank you for your inquiry. These should be available the first of November.