Sennheiser PX 685i (Black)

Lightweight Adidas Sports Series Earphones/Earbuds with Integrated iPhone/iPod Remote & Microphone


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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.

An Oldie, But a Goodie!

When you look around, technology has managed to work its way into just about every single persons life. Not that it is a bad thing, its one of the outcomes of people striving to achieve more. Sennheiser is a company founded off of that very concept. Time and time again, Sennheiser went out and achieved more. Changed the way people see many things, new or even very common. The PX 685i is not a brand new idea, just a brand new direction on a very popular concept. The idea of a lightweight "Headband" (not neckband, very common mistake) Headphone was a very popular thing when portable audio became possible. Mainly paired with their corresponding AM/FM radio, CD player, etc., they were built for people who want to be able to listen to their music, while minimizing their potential restrictions. A walk, run, or jog isn't quite as enjoyable when your ear is sweating more than the rest of your body. Lets face it, it just flat out feels awkward. Sennheiser took this concept, and went all in. Better than ever, this oldie is the newest goodie.

Serious Sports & Audio Fans Only!

If you have ever been a fan of sports, outdoor activities, going to the gym, or even Physical Education (P.E.) class, then chances are you are familiar with a little brand called Adidas. Chances are, 2 of the 3 people closest to you during these activities are currently sporting the brand. The main reason is Adidas is sort of the unofficial sporting goods leader. Since the beginning of time, Adidas (from Adolf or "ADI" Dassler or "DAS" the founder, ADI-DAS) has been supporting athletes and providing them with better, more effective sporting equipment. It should come as no surprise to see Sennheiser partner with a sporting goods world leader when they went after one of the most popular ideas ever. Sennheiser and Adidas were going to partner to manufacture the best all around headphones and best earbuds for athletes, sports usage, and gym goers. The result of this brilliant partnership, perfection. Headphones and Earbuds that can endure the torment that athletes will put them through. Headphones & Earbuds that can be washed, and rinsed clean after hours of dripping sweat, through incredibly humid weather. Durable & flexible building materials made to adjust and perform in the toughest environments. Adidas was not the only providing benefits here, because anyone who has ever owned a pair of Sennheiser headphones knows exactly how serious they take their sound. As always, premium audiophile grade acoustics we used in every single model. The PX 685i Headphones feature open acoustics within their in-ear design. This allows users to hear outside noise without the need to remove their headphones. Runners can rest assured, the open acoustics provide outside sound waves with a nice entrance to help make listeners aware of any sounds that may require your attention, or reaction. The icing on the cake is the built-in remote control and microphone. Nothing is worse than stopping your exercise to pull your phone out of your pocket to answer a phone call, or change the track to something a little more motivating. Now, clearing the call (or answering if you really want to) on your iPhone, or changing the track on your iPod is as simple as pressing a button on your remote. Don't ever forget, good things come to those who wait. But wait no longer, because dreams have come true.

General Features:

  • In-Ear Headband Adidas Active Sport Earphones/Earbuds
  • Integrated smart remote and microphone for enhanced usability and convenience of iPod/iPhone/Smartphone Phone Calls, and music listening
  • Let Siri do all the work with new "Siri Enabled" in-line microphone
  • Ergonomic headband for secure and comfort fit during workouts
  • High output drivers for impressive low end response
  • Para-aramid reinforced cable for superior strength and reliability
  • Acoustically tuned to deliver crystal clear sound at all volume levels
  • Ideal for use with all MP3, iPad, iPod, iPhone
  • Tangle-free cable for convenient listening
  • Designed with a snug fit for active people
  • Sweat and water resistant ensures reliable playback during the toughest, hottest, sweatiest environments
  • Gold-plated, corrosion-resistant stereo jack
  • Various ear adapter sets for maximum comfort
  • Main Color: Black
  • Additional Color Tone: Silver & Blue
  • Manufacturer Part Number: 504981
  • Also Found As: Sennheiser PX-685i Black, PX685i Black, PX-685i Silver, PX685i Silver
  • Authorized Internet Dealer
  • 2 Year Manufacturer's Warranty

Product Specifications:

  • Headphone Design: In-Ear (Inner-Ear Canal)
  • Headphone Fit: Headband
  • Driver Design: Dynamic Speaker
  • Frequency Response: 18-20,000 Hz
  • Sound Pressure Level (SPL): 120 dB
  • Total Harmonic Distortion (THD): <0.5%
  • Nominal Impedance: 16 Ohms
  • Pick-up pattern: Omni-directional
  • Connection: Angled 3.5mm (1/8 Mini Jack)
  • In-Line Remote & Microphone: Compatible with Apple iPod, iPhone, & iPad
  • Cable Length: 3.96 Feet (1.2 Meters, Symmetrical)
  • Special Feature: Sweat-Proof, Perspiration-Proof, & Water Resistant (Can be Rinsed Clean)

What's in the Box?

  • Sennheiser PX 685i (Black)
  • Ear adapters (S/M/L)
  • Air cushion adapters
  • Storage pouch
  • Cable clip

Headphone Design

Headphone Type

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.

Headband 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.

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.
Headphone Application

This is the application that the headphones are designed for. Each application has unique features that make it perfect for particular uses.

DJ: These headphones are durable, loud, and will often allow for one ear listening.

Gaming Delivers explosive sound and allows you to communicate with others.

Home Hi-Fi: These audiophile headphones are engineered to produce high fidelity and accurate audio.

Home/Office: These headphones are designed to produce rich, brilliant sounds that the artists would appreciate.

Sports: Designed for active use. These headphones are made to stay in (or on) the ear during workouts.

Kids: Feature noise limiting technology so that your little ones don't damage their ears listening to music too loud.

On-the-Go: On-the-go headphones are lightweight and often fold up for easy storage and portability.

Student: Compact and rugged enough to survive life in a backpack; inexpensive enough to not hurt the wallet of a student.

Studio: Reproduce music perfectly without any coloration. Look here for reference quality studio monitoring headphones.

Traveler/Airplane: These headphones are compact, lightweight, and have a portable design.

Acoustic Principle

The basic design of the headphones. There are 3 different types:

Open: Have ports that allow air through the back of the diaphragms, enabling the headphones to sound like the music is coming from an outside source.

Closed: Completely sealed and have no air passing through the diaphragms. Sounds like you are in a closed off room.

Semi-open: Have slots or ports in the back of the cup and are partially open. This allows for a mixed sound between an open and closed headphone.


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.
Device Controls & Compatibility
Refers to the devices the in-line controls are compatible with.
Apple 3 Button (Volume, Track Up/Down, Play/Pause)
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.
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.

Bluetooth means that the audio signal is transmitted from your device to the headphones via a Bluetooth connection.

Corded or Bluetooth means that the headphones can be used as corded headphones or as Bluetooth headphones. They have an input in one or both earcups for use as a corded headphone while they also have a built-in battery for use as Bluetooth wireless headphones.

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

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.
Connector Type
The type of connection the headphones use to connect to receive the audio signal from a music source. Traditional headphones use an analog 3.5mm headphone jack. Newer technology has allowed digital signals to be sent directly to the headphone using an Apple Lightning or USB-C cable.
Jack Size
Refers to whether the headphones use a 3.5mm or 1/4" headphone jack connection.
Jack Angle

The Jack Angle refers to the angle of the input jack on the headphone cable.

Straight Jack: Straight plug with no angle.

Angled Jack: Angled plug, usually a 90 degree angle.

Swivel Jack: A swivel jack is able to swivel between a straight plug and an angled plug.

Angled Jack
Detachable Cable
Refers to whether the cable can detach from the headphones. If a pair of headphones has a detachable cable, the cable can be replaced with a longer cable, one with (or without) a microphone or if you accidentally damage the cable.
Color Shades
Primary color shades of the headphones.
Refers to materials used to build the headphones. Most headphones are built from some combination of plastic and metal to give you a durable pair of headphones.
Ear Cushion/Earbud Material
Refers to the material that the ear cushions/earbuds are made from. Ear cushions and earbuds are available in a variety of materials, ranging from basic rubber eartips to plush leather ear cushions intended for maximum comfort.
Protective Case
Refers to whether a pair of headphones come with a protective case.
Water Resistant
This refers to the level of water resistance of the fitness tracker. Some fitness trackers are water resistant and can be used while swimming, while others are only splash proof or should not be used near the water.
Refers to whether a pair of headphones can be folded up. These headphones feature hinges in the frame above the earcups that allow the headphones to neatly fold into a much more manageable size. Folding headphones are perfect for anyone who spends a lot of time traveling and needs a compact pair of headphones that can fit in their bags.

Audio Features

Driver Type

The physical design of the driver in the headphones.

Balanced Armature:
A balanced armature driver uses a coil wrapped around an armature which is held in between two magnets until it is stimulated by an electrical current. When stimulated, this armature is magnetized which causes it to rotate one way or the other around a pivot point which moves the diaphragm to create sound. Balanced armature driver headphones are generally earbuds and can have multiple drivers in each earbud.

Dynamic drivers are the most common driver type. They feature a permanent magnet, usually neodymium, a voice coil and a conical diaphragm to drive your music. A dynamic headphone driver looks pretty much identical to any typical home theater speaker.

Electrostatic drivers are made up of an extremely thin membrane, usually a coated PET film, stretched between two metal plates. An electrical signal is applied to the metal plates to create an electrical field which, depending on its polarity, draws the speaker diaphragm toward one of the plates which forces air through the perforations in the diaphragm which generates the sound wave.

Planar Magnetic:
A planar magnetic driver is made up of a large membrane suspended between two sets of oppositely aligned magnets. An electric charge is applied to the membrane to induce movement and produce sound waves.

The opposition to electric current, a higher impedance means a higher electrical resistance. This is measured in ohms.
16 ohms
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
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
Audiophile headphones represent some of the finest headphones available. Audiophile headphones produce genuinely outstanding sound quality as well as extraordinary build quality, components and comfort. They are truly the finest headphones available.
Built-in Amplifier
This refers to whether the headphones have an amplifier built-in.

What is in the Box?

Main Product
The main product in the box.
Sennheiser PX 685i Earphones (Black)
Accessories included with the headphones
Carrying Case
Replacement Ear Tips
Paperwork included with the product.
User manual
Warranty/Registration card

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


Duncans Mills, CA

Awesome Product !!

March 17, 2014

I've recently purchased this headset and I have to say, it is extremely awesome !! I can turn the sound up while in a quiet library and it cannot be heard AT ALL. I did a test just to see how loud I could turn it up without it being heard because I've had headphones in the past that you can hear music even at a quiet level while they are in your ears. Not these headphones. Even when they are out of your ears at a louder than normal volume, music still cannot be heard. They are the best I've ever owned !!

25 of 30 found this helpful

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Madison, WI

Good Running Headphones

August 22, 2014

I recommend these headphones for running and other high-impact forms of exercise. They sound great, stay secure in your ears, and are very durable--probably the best running headphones I've found, and I've tried a lot of different brands and models.

20 of 24 found this helpful

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South Florida

Great for gym use

March 31, 2014

I own the Sennheiser CX 685 ear buds and Sony MDR-EX210 ear buds. The Sennheiser sound better than the Sony. But both of these do not stay in my ear at the gym no matter which size buds I use. I purchased this PX 685 so I don't have to worry about that any longer. They sound great for the price, with a good equalizer app they sound even better. They do have lesser bass than the CX 685, but only because they aren't stuffed inside your ear canal like the ear buds. The only con I can think of is the pouch that comes with it. They are a tight fit and the velcro will rip the foam pads off. So either avoid using the pouch or go on Ebay and purchase spare foam rubber pads for a few bucks.

21 of 26 found this helpful

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Was what I was hoping it would be

February 3, 2014

Ear buds don't fit in my ears so running with music has been impossible. This product works great for me. It stays on my head when running and the volume adjustment, stop music, skip song option is great and easy to use while running.

19 of 25 found this helpful

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Why did you choose this?
Sonic Electronix Store
this type of headphones fits best and comfort
EHUD S on Sep 6, 2014

Product Summary


Model Number

PX 685i



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 PX 685i (Black)