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Sennheiser CX 215 - Blue

Noise Isolating Iconic Sound Series Earbuds with Powerful Bass Response


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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.

Always An Upgrade, CX 215

Sennheiser's CX 215 is a brilliant in-ear headphone, with innovative finger-contoured housing design that provides users easy adjustments, and ear canal placement. These in-ear dynamic earbuds fully live up to the Sennheiser brand's expectations, yet they meet an incredibly low price point for the performance. They are designed with a low impedance, so they are easily powered by an every day Smartphone, Blackberry, Android, Tablet, iPod, iPhone, etc. As for sound... do you really even have to ask? Its a Sennheiser! And Yes they are incredible with crystal clear highs, and powerful deep bass. Available in five exciting new colors, its time for an upgrade!

What's In The Box?
  • Sennheiser CX 215 Earphones (Blue)
  • Ear adapter set (S/M/L)
  • User Guide/Operating Instructions
  • 2-Year Warranty

General Features:

  • In-Ear Iconic Sound Series Headphones/Earphones
  • Ergonomic eartips 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
  • Gold-plated, corrosion-resistant stereo jack
  • Various ear adapter sets for maximum comfort
  • Main Color: Blue
  • Manufacturer Part Number: 505440
  • Sennheiser CX 215 Headphones Are Available In:
  • Authorized Internet Dealer
  • 2 Year Manufacturer's Warranty

Product Specifications:

  • Driver Type: Dynamic
  • Driver Design: Inner-Ear (Ear Canal)
  • Frequency Response: 22 Hz - 20,000 Hz
  • Sensitivity: 110 dB
  • Nominal Impedance: 16 Ohms
  • Sound Pressure Level (SPL): 110 DB (1kHz/1Vrms)
  • Replacement Ear Tips Included:
  • Cable:
    • Length: 47.2 inches (1.2 Meters)
    • Type: Symmetric Cable
  • Cord Plug: 1/8 Inches (3.5 mm) Angled Plug

Also Found As: Sennheiser CX215 Blue, CX-215B (CX215B), CX-215BL (CX215BL), CX-215BLU, CX215BLU

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).
22 - 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".
110 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
Primary Color
This is the main color of the item.

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


Canovanas, PR

Top Value - Stylish In-Ear Headphones

September 18, 2013

These are a good set of earphones and for the money they are well worth the price. The sound is great!!! I recommend them to you.

2 of 3 found this helpful

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Bargain Seeker


Great earbud headphones

April 24, 2014

Great product, earbuds fit well, with multiple sizes to adapt to your liking, very impressive base and sound.

1 of 2 found this helpful

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Hanford, CA

The best

April 1, 2014

These are the best earphones I have purchased yet! So good I ended up buying a 2nd pair for a friend of mine.

1 of 2 found this helpful

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Missy D

Chandler, Arizona

Awesome Item!

February 27, 2014

These headphones are amazing. I put them on and I cannot hear anything, including the TV my roommate it watching while I am on my laptop in the same room.

1 of 2 found this helpful

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Norwalk, Iowa

Great Buds!!

February 14, 2014

Kept buying good quality earbuds that would go out on me. Read good reviews on these and I have to agree, they are very nice! My wife is thinking about buying a pair just like mine (or stealing mine and making me have to buy a new pair).

1 of 2 found this helpful

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New York, NY

Sennheiser CX 215 Blue

January 31, 2014

Great set of ear buds for the price range. Nice all around.

1 of 2 found this helpful

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North Myrtle Beach, SC

Great quality and great price

January 5, 2014

Probably one of the best small ear buds available for the money. The Sennheiser CX 215 is clear and comfortable.

1 of 2 found this helpful

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American Fork, Utah

Good sound for the price

December 3, 2013

These have excellent sound for the price. Most ear buds deliver highs well but very little base. These have much better sound than many ear buds in the price range of $20-$30 (I have several). They are slightly harder to get in my ears though.

1 of 2 found this helpful

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Foxboro, MA

Perfect Fit

November 19, 2013

The small earbuds fit perfectly especially when I am working out at the gym. It does cancel some of the blaring music.

1 of 2 found this helpful

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Accessory Tools and Products

Accessories added

FiiO E6

Single Input and Output 1/8" (3.5mm) Interface and USB Rechargeable Battery

Your Price $27.99

StreetWires ZN5XF35

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

Your Price $16.95

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CX 215 Replacement Ear-Tips (5 Pairs, Large) thumbnail
Sennheiser Replacement CX 215 Ear-Tips, Large - 525785

• Comes With Five Pairs
• Color: Black
• Size: Large

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Product Summary


Model Number

CX 215 Blue





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 215 - Blue