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Sennheiser MX685 Adidas SPORT Headphones

  • 1/8 inch (3.5mm) Connector
  • Symmetrical cable
  • Maximum ruggedness and durability
  • Slide-to-Fit holding mechanism for secure
  • 2 year warranty
  • Email this page
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Sennheiser MX685 Adidas SPORT Headphones

Durable, portable and secure, these ear buds are perfect for your active lifestyle and deliver powerful, natural stereo sound. Sliding holders help keep them in place and adapters ensure a snug, comfortable fit.


Move up the fitness ladder and push yourself harder with the MX 685 SPORTS earphones. The unique, patent-pending slide-to-fit holding mechanism ensures a custom fit that is comfortable and secure. You can focus your attention on your workout, not on your ears. The high-output drivers deliver an energizing yet natural stereo sound, motivating you to run that extra mile. Design-wise, the in-ear style provides greater situational awareness and safety: you can stay aware of surrounding traffic noise while you exercise.


The headphone is sweat- and water-resistant. Various ear adaptor sets offer maximum comfort.

Slide-to-Fit holding mechanism provides a secure, comfortable fit throughout your workout.

Ideal for use with all MP3, iPad, iPod, iPhone, miCoach, CD players, mobile phones (3.5mm) and A/V systems installed in gyms. Two-year warranty.

  • Maximum Ruggedness and Durability
  • Customized Fit
  • Excellent Connectivity


Frequency Response 18Hz - 20,000Hz
Sound Pressure Level (SPL) 118dB (1kHz / 1Vrms)
THD - Total Harmonic Distortion (1KHZ, 100 DB SPL) <.05%
Impedance 16O
Weight 150g
Cable Length 1.2m symmetrical cable
Jack 1/8in. (3.5mm) Angled plug
Warranty Two-Year

What's in the Box



Learn more about the Sennheiser Electronic corp. MX685



General SPEC

Frequency Response
Input Impedance
16 ohms
118dB S.P.L. at 1KHz
1/8 inch (3.5mm) iPhone compatible
Ear Coupling
Cord Length
3.94 ft./1.2 m (symmetrical)


Symmetrical cable

Maximum ruggedness and durability - Sweat and water-resistant

Situational awareness - Blocks less outside noise so you stay aware of your immediate environment

Premium comfort - Various ear adaptor sets for maximum comfort

Customized fit - Slide-to-Fit holding mechanism for secure and comfort fit during workouts

Natural sound - High output drivers

Superior strength and reliability - Para-aramid reinforced cable

Excellent connectivity - Ideal for use with all MP3, iPad, iPod, iPhone (iPad, iPhone and iPod are trademarks of Apple Inc., registered in the U.S. and other countries.), miCoach, CD players, mobile phones (3.5mm) and AV systems installed in gyms

Quick Info


  • Limited Warranty period (parts): 2 years
  • Limited Warranty period (labor): 2 years

Customer Reviews of the Sennheiser Electronic corp. MX685

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  • Anonymous
  • 11/25/2014 11:46:50 AM
  • Tech Level: Average
  • Ownership: 1 week to 1 month
  • Verified Owner

3 out of 5 eggsAverage

Pros: it works
Looks cool

Cons: Sound quality pretty lame
Different types of earpieces are useless, some ripped first week, others come off while taking off or putting headphones on.
Ended up using the original blue ones.

Other Thoughts: I used to have Bose mie2 which went through the Kirby vacuum cleaner. They worked after but the wiring was stripped. Decided to buy new headphones with similar ear attachment. Found these. I purchased Sennheiser before and really expected good quality. Nope. Disappointed.

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  • Anonymous
  • 1/14/2014 7:09:16 PM
  • Tech Level: Somewhat High
  • Ownership: 1 month to 1 year
  • Verified Owner

4 out of 5 eggsGym headphones

Pros: Sound quality is about what I expected from the price range. Low end needs a bit of a boost from the source side, but that may be due to me having trouble getting them to fit properly.

Adjustable size

Still working, even after almost a year of gym abuse, which is about 6 months longer than my previous earbuds.

Cons: Like I said, I have a bit of trouble getting them to fit. They aren't too loose, but I'd like a slightly snugger seal.

I have to be conscious of the adjustable tabs, they're like little fish hooks that like to get snagged on everything.

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