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Koss 'The Plug' In-Ear Headphones (Black)

by Koss
| 10 answered questions

List Price: $19.99
Price: $9.70 & FREE Shipping on orders over $35. Details
You Save: $10.29 (51%)
In Stock.
Ships from and sold by Amazon.com. Gift-wrap available.
  • 16 to 23,000 Hz frequency response
  • Deep bass performance
  • 4- Foot cord
58 new from $8.05 1 used from $10.99
$9.70 & FREE Shipping on orders over $35. Details In Stock. Ships from and sold by Amazon.com. Gift-wrap available.

Frequently Bought Together

Koss 'The Plug' In-Ear Headphones (Black) + Koss PORTABLE Replacement Cushions
Price for both: $13.69

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Technical Details

Size: ..Stereo | Color: other
  • Noise-Cancelling-Feature

Compare to Similar Items

This item: Koss 'The Plug' In-Ear Headphones (Black)
Customer Rating (2325) (218) (99) (20190)
Price $ 9.70 $ 9.99 $ 17.47 $ 6.45
Shipping FREE Shipping FREE Shipping FREE Shipping FREE Shipping
Sold By Amazon.com Amazon.com Amazon.com Amazon.com
Color other Grey other Black
Special Features Noise-Cancelling-Feature noise-isolation Carrying Case Ergo-Fit-Design
Fit In-Ear Intraaural In-Ear In-Ear
Dimensions 1 inches x 6 inches x 4 inches 1.1 inches x 6 inches x 2.7 inches 1 inches x 7.75 inches x 2.5 inches 6.75 inches x 3.6 inches x 3.25 inches
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Product Description

Size: ..Stereo | Color: other

Product Description

The Koss Plug revolutionized the world of in-ear headphones. A first of its kind, these are stereo, noise isolating in-ear headphones that deliver the kind of accurate acoustical reproduction and isolation typically found in high-end, closed-style high fidelity headphones. A dynamic element positioned just outside the ear connects to a tubular port structure that inserts into a soft, expandable cushion. The soft, foam cushion expands for a custom comfort fit with every listening experience. It also improves isolation, plugging out ambient sounds, and enhances deep bass and treble clarity.


Koss's miniature portable earphone, affectionately dubbed "The Plug," makes use of an ear-cushion material (similar to that used in sound-blocking earplugs) that slowly expands in your ear canal to provide a custom fit and maximum sonic isolation from external noises. A detachable, extrawide headband makes these Koss-termed "stereophones" easy to carry or store.

For accurate sound reproduction, these earbud-style headphones are made with oxygen-free copper voice coils and neodymium iron boron magnets. You can enjoy them with either a portable or home audio device, since both 0.125-inch and 0.25-inch adapter jacks are included.

"The Plug" weighs a mere quarter ounce and has a frequency response rated at an impressive 16 to 23,000 Hz (though its unlikely you'll hear bass output anywhere close to what you'd get from a similarly rated loudspeaker!).

Impedance is 16 ohms, with less than a 0.3 percent distortion and reasonably high sensitivity of 112 dB SPL/1 mW.

Product Details

Size: ..Stereo | Color: other
  • Product Dimensions: 6 x 4 x 1 inches ; 0.3 ounces
  • Shipping Weight: 0.3 ounces (View shipping rates and policies)
  • Domestic Shipping: Item can be shipped within U.S.
  • International Shipping: This item can be shipped to select countries outside of the U.S. Learn More
  • ASIN: B00001P4XA
  • Item model number: 156407
  • Average Customer Review: 3.9 out of 5 stars  See all reviews (2,325 customer reviews)
  • Amazon Best Sellers Rank: #243,835 in Electronics (See Top 100 in Electronics)
  • Date first available at Amazon.com: July 8, 2002

Customer Questions & Answers

Customer Reviews

Most Helpful Customer Reviews

257 of 263 people found the following review helpful By Mark Colan TOP 1000 REVIEWERVINE VOICE on June 9, 2003
Size: ..StereoColor: other Verified Purchase
NOTE: the description I saw on the Amazon page does not reflect the product I have. Above it discusses a headband and an adapter which are not part of this product. Also, the rated frequency response is 10-20k, not 16-23k. I think this is (or was) an Amazon editorial error.
My interest for this product is as a solution to listening to music, lectures, and movies while travelling, and I travel a lot. I have a set of Panosonic noise-cancelling headphones which were good (about five times more expensive than these earbuds) though bulky, but the plastic broke so they won't stay on my head now.
These earbuds are an excellent alternative to noise-cancelling headphones for the frequent traveller. I find them more comfortable for extended listening than most conventional headphones. The ability to seal out noise from the external environment is very good, and makes it possible to understand what actors are saying when watching a movie on an airplane.
The overall performance - sound quality and noise blocking - is not as good as the Bose noise cancelling headphones, but the Bose are 20 times as expensive, much less convenient to carry, and subject to damage from the rough world of the road warrior. If The Plug had an optional noise-cancelling unit (say, combined with the eq), it would be a killer combination - are you listening, Koss?).
The sound is good. Bass-heavy, to be sure; I would like them better if they had a flatter response, but the product is marketed at the portable music crowd, and many of them are looking for dramatic bass rather than golden-ears sound.
Besides, mobile sound is always a compromise, it's just a question of whether the compromise they chose works for you.
Here are some problems I've heard and the solutions:
1. "They fall out of my ear.
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235 of 242 people found the following review helpful By Meghan on June 19, 2008
Size: ..StereoColor: Charcoal Verified Purchase
In preparation for the new iPhone coming out in July, I needed to get a new set of headphones that included an inline mic/answer-end/pause button. After a week or so of research, I decided to try this pair, even though there is very little info or reviews regarding actual sound quality.

I switched from Sony EX-51/EX-71 headphones to the mm 50. The MM 50 iP headphones sound similar to the EX headphones I've used, with balanced sound throughout, but even better and clearer. I switched the included ear cuffs from the MM 50s for the ones I used on my Sonys, as the MM 50 set is a bit tacky and had little bits of crap stuck to them just by taking them out of the box. Ick.

The MM 50 wires are very thin, and the whole set is extremely lightweight. They are even more comfortable than the Sonys. Also, the longer I wear and use them, the more I like them.

The cord is shorter than usual, which I like because I tend to catch the wires on stuff if there is too much extra. I put the Nano/iPhone in my right back pocket, and run the headphones up to my left ear, and the length is perfect. From where the phones split (note these are "J-shaped" headphones, where the cord for the right ear goes behind your neck) to the jack that plugs into the iPhone, the cord is just over 36" long.

Currently I'm using them with a Nano, but will be switching to the new iPhone when it is released. The answer/end/ff button works fine with my current 2G iPhone, but there is a noticeable hiss at low volumes sometimes. Also, I can not get the volume from the iPhone to go low enough (I listen at the office and need to be able to hear through them) but I think this is on the iPhone side, as the Sonys don't get as quiet as they do on the Nano either.
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59 of 60 people found the following review helpful By Hrvoje Maric on February 25, 2002
Size: ..StereoColor: other
I heave read many of the review on this site, and I probablly would have not used my Koss earbuds to the full extend if I have not read many of the reviews. First issue is that people cannot get the earbuds to stay in their ear. I found my earbuds not needing any modification when it comes to foam, but rather they way the earbud is placed in. The first problem that I had is stuffing it in my ear, they would fall out, and the foam would look all pushed back on the stick (refering to the rubber sticking out from the headphone). YOu must firmly squeze the foam from all sides and quickly insert it into the ear. You will know if the ear bud is firmly in by shaking your head, and nothing is falling out. Do the same for thea other ear. Now you will hear the amazing quality of the sound that these pupies can give. The base is amazing, these earbuds I find better quality then my Sony Studio Monitoring headset (one great advantage of earbuds, the volume on my MD player doesn't have to be set to the max to hear any music). The sound quality is amazing, the isolation from outside is great, especially on a loud bus, unlike other earbuds. ONLY IF THE EARBUDS SET PROPERLY INTO THE EAR YOU WILL HEAR THE FULL QUALITY OF THE SOUND... I heard no distortion...I hope my review helped you on earbuds.
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214 of 234 people found the following review helpful By Alex Hills on March 16, 2013
Size: Old Bluetooth 3.0Color: Black Verified Purchase
I had previously owned the Sennheiser CX 680 Earfin Sports Earbuds. I wrote a lengthy review of these earbuds, which is the "Most Helpful" review of this product on Amazon.com. I used my CX 680s several times a week at the gym and they performed well; they had a good run (so to speak). After about two years the plastic piece that connected one of the earbuds to its wire came loose, but it was easily fixed with superglue. About six months later, however, the sound gave out in one earbud, forcing me to trash them.

In hindsight, and in light of my recent purchase of the CX 685s, I would give the CX 680s 3 stars. The thing that bothered me the most about them was that with a lot of movement and sweating (e.g., running) the earfins sometimes became squishy and dislodged from my ear, thereby causing the earbud to come out. This was annoying and kind of defeated the purpose of these types of earbuds. By comparison, I will say that the PMX 70s (also reviewed) stayed in much better than the CX 680s during exercise. The downside to them for me was that they were the neckband type and were not noise-isolating. Those things and the sound starting to cut out due to issue with the wiring within several months of use (I just sent them to Sennheiser hoping they will repair or replace them) forced me to look for new earbuds.

Again I spent many hours searching for and reading reviews about earbuds designed to be noise-isolating and stay in place during activities like running. I narrowed my search to
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Koss 'The Plug' In-Ear Headphones (Black)
This item: Koss 'The Plug' In-Ear Headphones (Black)
Price: $9.70
Ships from and sold by Amazon.com