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Sennheiser CX300B 3.5mm Connector Canal Headphone

  • 18Hz-21KHz
  • 3.5mm Connector
  • 3.3 feet Cord Length

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  • Overview
  • Specifications
  • Warranty & Returns
  • Reviews

Designed to fit, these headphones adapt to your ears with three sizes of cushion! The Sennheiser CX300B ear canal headphones fit any size ear for excellent quality sound!

A 3.5mm jack fits these headphones to a world of players; from your MP3 to your DVD player, you can hear it all! Play your portable game system or your MP3 player and hear every nuance of sound! This lightweight canal headphone is 3.3 feet long, long enough to easily reach from your pocket to your ears. With efficient ambient noise attenuation, all you hear is what you want to hear!

Lightweight, small and powerful, these headphones are a great investment in your personal entertainment. Resounding bass and thrilling soprano are yours, when you listen through these lovely headphones! Why not order the Sennheiser CX300B, today?

  • newegg Powerful Stereo Sound The Sennheiser CX300B headphone delivers powerful, bass-driven stereo sound and fits perfectly into your ear canals to effectively block out ambient noise for an immersive music experience.
  • newegg Ergonomic The ergonomic contoured ear tips in three different sizes deliver maximum comfort to suit your needs, perfect for extended listening periods.

Learn more about the Sennheiser Electronic corp. CX300B



General SPEC

Frequency Response
Input Impedance
112dB S.P.L. at 1KHz
Ear Coupling
Cord Length
3.3 feet


Powerful, bass-driven stereo sound
Perfect fit in the ear canal due to ear adapters in different sizes (included in the delivery)
Excellent attenuation of ambient noise
Extremely small and lightweight
Ideal for use with all MP3, CD, DVD, MD players and portable game systems with 3.5 mm headphone sockets
Asymmetrical cable


Package Contents
CX300B Headphone
3 different sizes earbuds
Warranty, Returns, And Additional Information

Customer Reviews of the Sennheiser Electronic corp. CX300B

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  • Michael G.
  • 8/1/2011 12:17:22 AM
  • Tech Level: High
  • Ownership: more than 1 year

5 out of 5 eggsAwesome

Pros: Crazy hard bass. Great sound quality. Low Frequency Response is amazing.

Second pair i have purchased because i lost my first pair.

I washed mine in washer/dryer and they still work fine.

Cons: none

Other Thoughts: How many headphones have you washed/dryed and still work perfect?

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  • Anonymous
  • 1/18/2011 8:57:31 PM
  • Tech Level: Somewhat High
  • Ownership: 1 month to 1 year
  • Verified Owner

3 out of 5 eggsOk

Pros: Sounds great

Cons: Newegg or the manufacturer should have noted that one channel is longer than the other. Annoying. I wouldnt have purchased them if I knew.

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  • Xiuyin H.
  • 8/23/2010 10:06:07 AM
  • Tech Level: Average
  • Ownership: 1 day to 1 week
  • Verified Owner

5 out of 5 eggsGreat

Pros: Nice bass and also hi-fidelity to the original soundtrack

The wires are of great quality,, don't need to worry about them being cheap and inferior.

Cons: Not really...

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  • Matthew H.
  • 8/19/2010 10:26:54 AM
  • Tech Level: High
  • Ownership: 1 week to 1 month
  • Verified Owner

4 out of 5 eggsGreat sound quality

Pros: Excellent sound quality and comfortable fit. Like all sennheiser audio products, their mids/highs are excellent and the bass isn't overwhelming.

Cons: The cord could be a little longer if you intend on running with your mp3 player in your pocket instead of in an arm band.

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  • Brent D.
  • 8/4/2010 1:52:05 PM
  • Tech Level: Average
  • Ownership: more than 1 year

3 out of 5 eggsperhaps not really a sennheiser??

Pros: they get pretty loud without distortion. sound is acceptable and more comfortable than the standard iPod earphones. very tight seal with ear canal -- so great for listening in loud environments, airplanes etc. Good value for $20-$30.

Cons: a little bass heavy, but i kinda prefer it or at least got used to it -- it's better than the alternative. i wouldn't call the sound balanced. Cord is pretty short and gets tangled easy. it's made out of a rubbery material and is more difficult than most to untangle, it clings to clothing which causes the earbuds to work their way out when jogging, walking mowing etc.

Other Thoughts: I didn't actually own these, however I did have a pair of Creative earbuds (EP-630 -- google it) which look exactly like these, right down to the cord, the plug, the ring and it's dull finish. I think these are generic headphones or rebranded by sennheiser. Don't expect sennheiser quality sound b/c it has a sennheiser name. You pay for what you get and these are relatively cheap.

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  • Anonymous
  • 7/29/2010 10:20:48 PM
  • Tech Level: High
  • Ownership: 1 week to 1 month

1 out of 5 eggsdon't buy these

Pros: they sound pretty good!

Cons: the assymetrical cable is an absolute joke, why the sennheiser design team went with this is incredible..... i sold mine after a few weeks of frustration

Other Thoughts: this is probably the reason these headphones are so cheap now,nobody wants to buy or own them

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  • Anonymous
  • 10/19/2009 10:20:13 AM
  • Tech Level: Average
  • Ownership: 1 week to 1 month
  • Verified Owner

5 out of 5 eggsThe Sound Quality of Massive Over the Ears Headphones in Earbuds!

Pros: Wonderful sound quality! Excellent bass! Distinct highs and mids. Cancels all outside noise. Stays in ears easily. Cord isn't too long and doesn't catch on my bicycle and get shredded like several of my older pairs, but not too short either, no pulling on my ears.

Cons: none yet

Other Thoughts: These are by far the best earbud headphones I've used. They've actually increased the amount of work I get done. Buy them.

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  • Anonymous
  • 10/19/2009 9:17:00 AM
  • Tech Level: High
  • Ownership: more than 1 year
  • Verified Owner

5 out of 5 eggsHappy, happy

Pros: Good sound, sound isolating, and comfortable.

Cons: None

Other Thoughts: I misplaced my first set of CX300's and bought the CX400's to replace them. But the cord on those is a strange two-piece thing, so I donated those to my wife when I found the CX300's were on close out.

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  • Tim W.
  • 10/19/2009 8:53:47 AM
  • Tech Level: High
  • Ownership: more than 1 year
  • Verified Owner

4 out of 5 eggslasted @ 1 yr

Pros: they lasted @ 12 monts of daily use before the l shaped connector started failing. asking sennheiser if they will replace them.

otherwise buying another pair - has them for $16

they are that good i'll keep buying even if they break.

Cons: short cord is lame

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  • Brett S.
  • 10/15/2009 11:17:52 AM
  • Tech Level: Somewhat High
  • Ownership: 1 month to 1 year
  • Verified Owner

4 out of 5 eggsDecent when on sale

Pros: They're quite decent at noise cancellation. Walking around downtown with them is almost dangerous! If you can get them to fit right, they have good bass (for the price) mids are slightly recessed. Not much to say about the highs.

Cons: You can hear if the cord is bumped. But it's not as loud and crazy as everyone makes it seem. It's bearable. And if you have a little clip thing or some tape, you can pretty much get rid of all of the noise.

Other Thoughts: I wouldn't pay $40 for them, let alone $80. But if you can get 'em while they're on sale for $20ish, do it. They kill others at this price (see: skullcandy, iBuds, etc). I give them a 4, because I've definitely heard better headphones. But if it were a value rating at $20 to maybe $30, I'd give 'em 5 easy.

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