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Sennheiser CX 685

Inner Ear-Clip Stereo Ear Buds Adidas Active Sport & Gym Series Earphones with Portable Travel Pouch


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This item has been discontinued

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Sennheiser CX 686G

OUR PRICE: $60.41

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Audiophile, Premium, Best In-Class, Sennheiser

Sennheiser is a name that is synonymous with audiophile products. They have been viewed as a premium, top-tier (dare we say "The" top-tier?) brand since the beginning of time. Laboratorium Wennebostel's time that is. In 1945, Prof. Dr. Fritz Sennheiser founded Laboratorium Wennebostel's, or "Lab W" in a pleasant half-timbered house. Fritz Sennheiser was born with a gift. When he was 11 years old, he saw an early radio that inspired him to build a crystal radio. Again, he was 11 years old. There was no turning back from that day. The following year after founding "Lab W", Sennheiser produced his microphone. From that point on, it was one success story after the other. Sennheiser's technology continued to improve, and "The Bar" continued to rise. In the mid 60's, Sennheiser released the HD 414, the world's first "Open Headphones". That very day changed the future of headphones forever. That very same headphone, the HD 414, not only helped establish Sennheiser as a leading headphone manufacturer, but it sold over 10 million units. It is the best selling headphone of all time, and Sennheiser had just gotten started.

What's In The Box?
  • 1x Sennheiser CX 685
  • 1x Ear Tip Sleeves (S/M/L)
  • 1x Air Cushion Adapters
  • 1x Storage Pouch
  • 1x Cable Clip
  • 1x Cleaning Tool
  • 1x 2-Year Warranty Information

General Features:

  • In-Ear Clip Adidas Active Sport Headphones/Earbuds
  • Tough, rugged design ideal for any active lifestyle/environment
  • Water Resistant and Sweat Resistant guarantee optimal performance, in rain, sweat, or shine
  • Ergonomic earhooks for optimal secure fit
  • High output drivers for impressive low end response
  • Para-aramid reinforced cable for superior strength and reliability
  • Ideal for use with all MP3, iPad, iPod, iPhone
  • Tangle-free cable for convenient listening
  • Designed with a snug fit for active people and use at the gym
  • Gold-plated, corrosion-resistant stereo jack
  • Various ear adapter sets for maximum comfort
  • Primary Color Tone(s): Silver & Black
  • Additional Color Accent(s): Blue
  • Manufacturer Part Number: 504966
  • Product History: Sennheiser CX 685 is the New, Updated version of the Sennheiser CX 680 (CX680) Earfin Sports Earbuds
  • Authorized Internet Dealer
  • 2 Year Manufacturer's Warranty

Product Specifications:

  • Frequency Response: 18-20,000 Hz
  • Sensitivity: 120 dB
  • Nominal Impedance: 16 Ohms
  • Total Harmonic Distortion (THD): < 0.5 %
  • Pick-up pattern: Omni-directional
  • Cable Connection: 3.5mm (Standard Stereo Mini Jack/Auxiliary Cable)
  • Cable Length: 1.2 Meters (about 4 Feet)
  • Built-In Microphone: No
  • Product Weight: 3.52 oz (100 g)

Product History:

Sennheiser CX 686G thumbnail
(newest, current model)
Sennheiser CX 685 thumbnail
(previous model, replaced by Sennheiser CX 686G)

Headphone Design

Headphone Type

Headphone type refers to the construction of the headphones.

Around the Ear means that the headphones wrap around the ear to provide a secure fit. This is most often seen in active and sports headphones.

Around the Neck means that the headphones wrap around the neck. This is also seen in active and sports headphones.

Earbuds means that the right and left sides of the headphones are separated and will fit securely into the ear. These are small, compact, and user friendly.

Over the Head headphones mean that the right and left speakers are connected with a support that goes over the head and rests on top. This is the typical headphone type.

Earpiece Design

This is the design of the earpieces on the headphones. Some headphones go inside the ear, while others rest on the outside of the ear. This helps you know exactly what type of headphones you will be receiving.

In-Ear: The ear buds go into the ear. Most often, the right and left ear buds are two separate pieces.

Enclosed-Ear: Usually are found on the larger headphones. They rest on top of the ear and have padding for comfort, as well as enclosing the ear to the speaker. This type of headphone helps to filter out surrounding noise.

On-Ear: This type of headphone involves the speaker sitting gently on the ear without going in the ear or sealing it off.

Specifically For
Some headphones can use an IR Transmitter in your vehicle, while some can be plugged into your media device and be used on the go or at home.

This is the lifestyle that the headphones are designed for. Each style has unique features that make it perfect for particular people.

Designed for those that are active. These headphones are made to stay in the ear during workouts. Whether you frequent the gym a lot or go running outside in the fresh air, these active style headphones will be your best friend.

For those that need the best in music quality. These audiophile headphones are engineered to produce high fidelity and accurate audio replication.

Disc Jockeys (DJs) require a special type of headphone that can meet their professional needs. These headphones are durable, loud, and will often allow for one ear listening.

Fashion Enthusiast:
For those that want to make a fashion statement with their headphones. Not only are these headphones designed with great sound quality in mind, but also great looks!

This lifestyle speaks for itself! If you love video games and want a pair of headphones that will deliver explosive sound and allow you to communicate with others, this is where you need to shop!

Music Lover:
These headphones are made to sound great. They are designed to produce rich, brilliant sounds that will play your music in a manner that the artists would appreciate. These headphones are for those that love music.

Musical Production / Recording Artists:
You're a music creator. Whether you're producing and mixing it down or in the studio recording yourself, you need a pair of headphones that will reproduce the music perfectly without any coloration. Look here for reference quality studio monitoring headphones.

Headphones need to be affordable and durable to keep up with the student lifestyle. A variety of styles can be considered a pair of student headphones.

Those that often find themselves on planes or on the road a lot. These headphones are compact, lightweight, and have a portable design. Some of the headphones in this lifestyle will feature noise cancellation technology that will help shut out outside noise.


General Features

Noise Reduction technology removes unwanted noise from a signal. Background or ambient noise can be removed to produce clearer speech and enhanced hearing. Typically these Active Noise Canceling (ANC) headphones are powered and use batteries to activate the noise canceling technology. Also referred to as Noise Reduction or Noise Cancellation.
Headphone Connection
This is how the headphones connect to the audio source.

Corded means that the headphones use a cord to transfer the audio signal.

Wireless means that the audio signal is transmitted wirelessly to the headphones.

1/4" Stereo Jack Adapter
Some headphones will come with a 1/4" stereo jack adapter to connect the usual 3.5mm jack to a 1/4" stereo plug.

1/4" Stereo jack is a larger audio jack that select electronics have.

Volume Adjustment
Volume Adjustment means that the headphone (independent of the source) can adjust the playback volume. Many headphones and ear buds have in-line volume control, which allows adjusting the audible volume from a switch on the headphones cord. Other headphones have a volume knob on the headphone can.
Built-In Microphone
This means that the headphones or earbuds have a built-in microphone. This can be a microphone on the cord, built into the headphone, or even a boom microphone. These mics can be used for music devices like iPods, for Smartphones to make and receive calls, or for gaming purposes.
Frequency Response
The range of frequencies the speaker will reproduce (lowest frequency to the highest). Bigger is better, meaning the wider the range, the better. The optimal range is 20 - 20,000 Hz (which is the range of human hearing).
18 - 20000 Hz
An efficiency or sensitivity rating tells you how effectively a speaker converts power into sound. The higher the number, the more efficient the speaker and the louder it will play with the same input power. An efficient speaker helps you maximize your available power. Most sensitivity ratings measure the speaker's output with 1 watt of input, 1 meter from the speaker. Some speakers' sensitivity is measured with 2.83 volts of input, instead of 1 watt.
Efficiency (1w/1m) is not an accurate indicator of a subwoofer's output capability and should not be used as a comparison to other speakers or subwoofers to determine which one is "louder".
120 dB
Driver Type
The physical design of the driver in the headphones.
The opposition to electric current, a higher impedance means a higher electrical resistance. This is measured in ohms.
16 ohms

Warranty and Return Policy

Parts Warranty Duration
2 years
Labor Warranty Duration
2 years
Warranty Provider

Summary of Customer Ratings & Reviews

Rating Distribution

5 Star
4 Star
3 Star
2 Star
1 Star

Average Attribution Rating


San Diego, CA

Excellent Earbuds! Worth the Extra Money!

September 3, 2013

I am glad I got these! I have gone through 2 pairs of earbuds in the last 4 months. Just cause they say sports earbuds doesnt mean they are built for them. 1 shorted out and the other one the cable split right at the earbud. I never thought my first pair of Sennheisers would be their Sports earbuds, I always imagined I would get one of their real high end ones, like the HD600 or 650, but I still think that day will come! Love these, they are the best sports earbuds out there on the market for sure! I know, I have tried most of them. Only 2 of them made me think they would be good enough, and they both failed! These could easily go for another $30 or $40 more. They fit is incredibly secure, and snug, fits "Like A Glove"! Great pair, lives up to the expectations!

3 of 5 found this helpful

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Mike C.

Ione, CA

Great Sound!

January 2, 2014

I bought these "in-ear headphones" for my wife because she was having trouble keeping the (old) ones in her ears while she was exercising due to sweat. Since then she says that these work very well & stay in her ears. I have tried them & they are comfortable & the sound they put out is awesome! You can't go wrong here! They're a little bit more expensive than some of the others but well worth the money... you get what you pay for! I would definitely recommend!

2 of 4 found this helpful

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Orlando, Fl

Worth every penny

June 25, 2014

This product is an absolute must have for the average audiophile athlete. I've used them for a few weeks in my training sessions (recovering clavicle surgery) and they have not fallen out once. The sound quality is clear in the mid -- high frequencies, but gets a bit muddy around 80-160 Hz. If you keep the volume levels low, like you're supposed to, then this issue is hardly noticeable. I highly recommend this product.

2 of 5 found this helpful

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Universal Thermoformed EVA Ballistic Nylon Shell Case for Earphones w/ Soft Inner Lining

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ZeroNoise 5 Series 3.5mm (1/8") mini-jack extension cable with oxygen-free copper wire

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Product Summary


Model Number

CX 685





Internal SKU


Internal Product ID


Sonic Electronix Wiring Guide

Wiring Diagram Legend

Warning: The image depicted shows the resistance change when wiring multiple subwoofer terminals. Please refer to your subwoofer's owner's manual for the proper wiring of its terminals. Sonic Electronix, Inc. is not responsible for damage caused to your audio system or vehicle due to improper installation. Please call tech support at 1-877-289-7664 if you require additional assistance.

Product Name: Sennheiser CX 685