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Sennheiser CX300II Binaural Headphone/Headset

  • High-quality dynamic speaker systems
  • Personalized fit in the ear canals
  • Customizable ear adapter system
  • Asymmetrical cable
  • Convenient carrying pouch included
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Sennheiser Precision CX 300-II Earphone

Offering a powerful, bass-driven stereo sound with greater clarity and improved dynamics are the CX 300-II Precision Black ear-canal phones. The various sizes of ear adapters (S/M/L sizes) provided in the package allow for a personalized fit as well as a high passive attenuation of ambient noise. Also, the asymmetrical cable design ensures a high wearing comfort as you listen on the go.


  • High-quality dynamic speaker systems for powerful, bass-driven stereo sound
  • Excellent fit in the ear canals and high attenuation of ambient noise (ear adapters in different sizes included)
  • Convenient carrying pouch included
  • Optimized for MP3, iPod, iPhone, CD players and portable gaming systems (iPod and iPhone are trademarks of Apple Inc. registered in the U.S. and other countries)
  • Asymmetrical cable
  • Two-year warranty


Wearing Style Ear-canal
Impedance 16Ω
Frequency Response (Headphones) 19 - 21,000Hz
Sound Pressure Level (SPL) 113dB
Cable Length 4ft (1.2m)
Transducer Principle Dynamic

Learn more about the Sennheiser Electronic corp. CX300II



General SPEC

Frequency Response
Input Impedance
16 ohms
113 dB (1kHz/1Vrms)
Ear Coupling
Cord Length
3.94 ft
0.50 lbs.

Microphone SPEC

Microphone Frequency Response
Minimum Frequency Response 19 Hz - Maximum Frequency Response 21 kHz


High-quality dynamic speaker systems

Personalized fit in the ear canals

Customizable ear adapter system

Asymmetrical cable

Convenient carrying pouch included


Package Contents
CX 300-II ear-canal phones

Manufacturer Warranty

2 Year
2 Year

Quick Info


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

Customer Reviews of the Sennheiser Electronic corp. CX300II

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  • James C.
  • 2/10/2014 9:52:01 AM
  • Tech Level: High
  • Ownership: more than 1 year

5 out of 5 eggsLove them.

Pros: Great sound, great bass.
Pretty durable for earbuds (I mean, c'mon guys--earbuds aren't made of adamantium. They won't last forever.)
J cable, for those who like that sort of thing.
Narrow 3.5mm plug--fits into phone cases with no problem.

Cons: I had CX300's and now CX300II's. Being careful about where I put them, they each lasted around 3 years. Both times it was a frayed wire that did them in--the 3.5mm plug and the drivers are fine.
If you're handy with a soldering iron you can do your own repairs for frayed wire breaks. Google "Sennheiser Wire Colors" and "Earbud Repair".

Other Thoughts: Use a dot of superglue under the rubber earpieces to prevent them from ever falling off.
If you lose your rubbers you can buy replacements from Sennheiser.

Did you find this review helpful? Yes No

  • On-Tai H.
  • 9/22/2013 10:13:46 AM
  • Tech Level: High
  • Ownership: 1 month to 1 year
  • Verified Owner

4 out of 5 eggsA solid buy.

Pros: the Asymmetrical cabling is a useful feature, sound quality is very good(especially if you configure your audio equipment, nothing sounds great without configuring for your own ears), solid build construction, comfortable wear.

Cons: i wish this had a clip somewhere around the splitting box, though this isn't major.
the right Earbuds' cable length compared to the left might be just a little long.
the 3.5mm connector is a J jack; most of the time people are going to want a straight jack for maximum slimness. not a major issue for me, however.

Other Thoughts: i've seen some of these reviews from people that seemingly have purposely bought equipment they didn't want and then bashing it.
the Asymmetrical cable is like that on purpose, it's not a factory defect. if you don't like asymmetrical cables, don't buy this. it's that simple. don't buy it anyways despite it being clearly stated as asymmetrical, and then complain.
Sennheiser even has an explanation on their website as to why the cable is asymmetrical, and a suggestion of how to wear these. if you follow these instructions, they are very comfortable to wear.

1 out of 1 people found this review helpful. Did you? Yes No

  • Shankar N.
  • 7/22/2013 1:43:25 PM
  • Tech Level: Somewhat High
  • Ownership: 1 week to 1 month
  • Verified Owner

5 out of 5 eggsgood

Pros: Light compared to my Bose headphone, small, easy to carry in pocket, decent sound quality, nice pouch

Cons: Noise isolation is good, but, sound quality is not as good as Bose QC2.

Did you find this review helpful? Yes No

  • Chad C.
  • 7/17/2013 9:36:26 PM
  • Tech Level: Somewhat High
  • Ownership: 1 month to 1 year

4 out of 5 eggsFantastic sound quality

Pros: Comes with a little coin purse to keep them in, great sound, anti-tangle cable actually makes it not tangle, comfortable. Asymmetrical cable makes it easy to figure out right from left and reduces cord noise.

Cons: Not very durable for the price.

Other Thoughts: Bought these in February and they broke in July. Always kept them in their little pouch and wrapped them around my first three fingers to store them. Oddly, the break happened in the main cable, not in the thinner one that went to the individual bud.

1 out of 1 people found this review helpful. Did you? Yes No

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