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  • Sennheiser CX 300S Bass-Driven Lightweight In-Ear Headphone (Discontinued by Manufacturer)
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Sennheiser CX 300S Bass-Driven Lightweight In-Ear Headphone (Discontinued by Manufacturer)


Currently unavailable.
We don't know when or if this item will be back in stock.
  • In-ear, sound-isolating design ideal for use with all MP3, CD, DVD, MD players and portable game systems with 3.5mm headphone sockets
  • Includes three different sized ear adapters to ensure a perfect fit
  • Offers powerful, bass-driven stereo performance
  • Features 21-inch asymmetrical cable and 3.5mm L-shaped plug
  • Stylish silver finish design; comes with two-year manufacturer's warranty


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  • Amazon Free 30-Day Tech Support: This item is eligible for free tech support for 30 days from the date of delivery. Over the phone, our trained technicians can help you set up, configure, connect, and troubleshoot so you can start enjoying your new purchase. Owners of qualifying products can reach Tech Support by calling 1-800-362-5703. Learn more


Technical Details

  • Brand Name: Sennheiser
  • Model: CX 300S
  • Color Name: Silver
  • Item Weight: 1 pounds

Product Details

  • Product Dimensions: 9 x 2 x 10 inches ; 1 pounds
  • Shipping Weight: 1 pounds
  • Shipping: Currently, item can be shipped only within the U.S.
  • ASIN: B000E1DSAE
  • Item model number: CX 300S
  • Average Customer Review: 4.1 out of 5 stars  See all reviews (237 customer reviews)
  • Date first available at Amazon.com: May 2, 2006

Product Description

Product Description

High quality stereo in-ear headphone with powerful bass for listeners "on the move". Ideal for use with MP3, CD, MD, DVD and others.

Amazon.com

The Sennheiser CX300-S Earbuds are the ideal ear buds for use with portable MP3, CD, MD, DVD players and many other portable devices with 3.5mm headphone sockets. Soft silicone-rubber ear adapters in three different sizes are included to ensure a perfect fit, high wearing comfort and an excellent attenuation of ambient noise. These ear buds, with their in-ear, sound-isolating design, offer powerful, bass-driven stereo performance. Extremely small and lightweight -- they weigh a bit more than an ounce -- the CX300-S will go wherever you take them. Designed in a stylish silver finish, the ear buds include a 3.5mm L-shaped plug and 21-inch asymmetrical cable. Sennheiser, an acknowledged world leader in headphone-transducer technology, offers a two-year manufacturer's warranty on the CX300-S.

Customer Questions & Answers

Customer Reviews

These earbuds block outside noise very well.
Invisible Ape
I have very small ears, and the smallest silicon adapter size fits perfectly and will not fall out on their own even when running.
A. Lawler
These are comfortable, with very good quality sound and extremely convenient.
A. Datta

Most Helpful Customer Reviews

5 of 0 people found the following review helpful By Heffe on April 12, 2007
Verified Purchase
The Good

- Comfortable, lightweight earbuds

- Decent sound quality for the price, much better than Apples stock earbuds, but still a bit tinny sounding and lacking bass for true audiophiles

The Bad

- Asymetrical cord design doesn't work for me AT ALL.

I ran the cord around the back of my neck as others indicated. I "guess" I can see what the engineers were getting at with this "ergonomic" design, but it doesn't work for me. While I'm jogging, the much shorter left cord tends to snag on the back of my neck, especially as I perspire; when I turn my head, the left earpiece tugs out of my left ear canal- very annoying. I've tried jogging with the cord in front, but the much longer right sided cord flops all over the place and the left ear bud ends up tugging uncomfortably on my ear. I suppose if you don't jog or workout with these headphones then you'll be alright.
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65 of 74 people found the following review helpful By Steve Z on May 4, 2006
Verified Purchase
I bought the CX 300S earbuds to use with my portable MP3 player while walking/jogging. The rubberized cord tends to stick/cling to your clothing which results in the buds getting yanked out of your ears as your clothing moves around (not to mention the fact that the cord is a little too short.) The buds must be fully inserted into your ear canal in order to hear the full fidelity of the music. With the buds fully inserted, most of the outside sounds are silenced... but this has the effect of amplifying inside (in-body) sounds such as breathing, teeth chattering, swallowing, etc... as well as the sound that the cord makes as it rubs around. Also, as the air moves past your head (while walking) you'll notice very pronounced wind noise! I also noticed that once you get the buds properly fitted, then you smile at someone, the buds tend to pop out! No more smiling!

Now, let me say that if I'm sitting at my desk with the buds properly fitted, the sound is amazing. Very good fidelity with bright highs and nice bass. But, to fully enjoy your music, you'll need to sit perfectly still and breathe gently (and don't touch the cord!)

If you're skeptical about the amplified internal body sounds, try this experiment: take your index fingers and gently press them into your ear canals... not all the way in as to fully plug your ears, but gently about 2/3's of the way in. This is about where the buds will sit when inserted. Now, gently tap your teeth, or take a deep breath. Take your thumbs and rub your index fingers... you get the idea.

I know that this is not a defect with the Sennheisers... this is an inherit problem with anything that you'd stick into your ear canal. And I've now learned that I absolutely hate in-canal phones...
Read more ›
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69 of 81 people found the following review helpful By Kaleidocherry VINE VOICE on February 7, 2006
Verified Purchase
I love the Super.fi 5 Pro. I've owned two pairs in the last few months, returned one because of irritation with UE. When I saw the new Senns were available I decided to A/B the two.

Well, for $150 less these guys are amazing! I have to push the volume up just a bit, but the tips are are comfy, the earpiece itself is discreet and easily maneuvered, and the sound is excellent - not too bassy like the cheap Sony IEMs. There's a soundstage! These are worth at least twice the price. My Super.fi's are going back to Headroom.

Test tracks:

1. "Naked Mole Rap" by Ron Stoppable and Rufus

2. "Le Jazz Hot" from Victor/Victoria

3. "Sentimentale" by Claude Bolling.

All three genres were marvelous. I can feel the piano keys tinkling. Buy these.
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15 of 16 people found the following review helpful By D. J. Sapen on March 26, 2006
Verified Purchase
I have had plenty of experience with the Etymotics and Shure's. The Ety's are fine, well-matched to the iPod; the Shure's are, I'm sad to say, god-awful and shrill, regardless of fit - like viewing fine art under fluorescent light.

The Sennheisers sound pleasantly like the larger headphones in the line - muscular, full, strong but realistic bass, good presence and drive, clean frequency response and lots of musical detail. And, at this price, they are untouchable. I prefer them marginally to my Etymotics, which cost substantially more, and of which I'm still very fond.

My only caveat is that these come with asymmetrical cords and no clasp, which takes more fiddling-around and makes them a bit more awkward to use when in motion. Not convenient for use while exercising, though not impossible. I've gotten used it, and the musical pleasure more than compensates. Mine also did not come with any sort of cleaning kit or specs - cheaply packaged. The point is to take them out of the package, and what good is documentation for something like this anyway? No big deal. The Etymotics, for a bit more money, have comparably musical sound and are more adaptible for use while exercising, performing or otherwise moving around.

Unless you're dedicated to megabuck fitted studio monitors, stop here, buy these and spend the rest of your money on music, a charitable donation and something nice for a loved one.
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14 of 15 people found the following review helpful By A. Thompson on July 24, 2006
Verified Purchase
I bought these for the gym, and for that purpose they provide good enough sound, since there is a fair amount of background noise anyways. Of course, they are vastly superior to the crappy Ipod earbuds... In my opinion, these are not audiophile headphones - good but not great. I would recommend these with reservations: I notice a fair amount of noise whenever I move around and the wires bump into my body, or themselves (even brushing against the wire ends up like a scraping sound when it's magnified by the earbud). My main warning is the noise I get from any breeze. Walking at even a moderate pace, I hear a fairly loud "wind noise" from the wires that is magnified into the earbuds. So here is my dilemma - these phones only sound good when you are not moving, but if you are sitting still for serious listening they just don't sparkle. Bottom line: I'll stick with these for now, but I wouldn't buy these again.
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