This head phone are great. i came from a used ur20 because i got them cheap on amazon. I almost bought them again for $30. However i ordered these on cyber monder got $20 off. I SOOO HAPPYY!!. i bought $20 skullcandy earplugs but they last only 1 month( bought 4 of them). A waste of money. Just buy these. I really Recomend it. No waste of money in theses. for $50 thats a deal .
Review by Sweetheart /
(Posted on 12/2/2017)
Great headset for a beginner audiophile
Overall
This headset was my first foray into "higher quality" headphones. Before this it was pretty much all built-in speakers or earbuds. I wanted to take my listening experience to the next level though and happened to hear about KOSS through the subreddit /r/buyitforlife who recommended this company for the lifetime warranty.
I just got my headset this morning and I already feel that I have been opened to a new world of audio possibilities. Everything from my favourite songs to random internet videos all of a sudden has new depths. I realize now that a lot of my cheap headsets sacrificed quality by just making everything loud. Wearing these headsets, I hear a ton of sounds I never recognized before.
Reading reviews on other websites, this is still a more mid-range headset in terms of audio quality, but absolutely stellar for the price.
My only con so far is that the headband is a bit hard and it's difficult to wear the headset comfortably at first. I'm considering buying a snap on headband pad to make it a little more comfortable for long-term listening.
I also want to add that the shipping service was great. They advised that the headset would likely be shipped within 3 days of purchase and that it would arrive within 4-6 business days of when it was initially shipped. They shipped it the morning after I ordered and it came in no less than 4 business days. As well their customer service team was very helpful with all my questions. All around very satisfying experience with the company and the product.
Review by Ina /
(Posted on 6/29/2017)
Great sound
Overall
Best bang for your buck!
Review by Mc /
(Posted on 1/25/2017)
Great value in closed-back 'phones
Overall
These are great sounding headphones for the money. I needed a pair of closed-back cans for travel--for general music listening, these are far superior to the $100 studio phones I've had(Audio Technica at-m40x/50x, Sony mdr-7506)and actually give the NAD Viso hp50 a run for their money at 1/4 the cost. Bass is a bit pronounced but has good definition, high's are a bit rolled off but fairly quick and detailed, and the mids(where most of the music is) are excellent. Great job Koss!
Review by Duffy /
(Posted on 1/9/2017)
Best Sound Good Bass , UR423i
Overall
I'm writing from TAHITI, i test this headphone, It's very good sound, bass up, treble and mdle excellent.. If you like the PORTA PRO models , you like this one ....
Review by ARNAUD /
(Posted on 11/19/2016)
Best $49 in audo.
Overall
I've owned Grado 1000Si headphones at $995. I've owned the Grado Sr325i's at $295. I now own a pair of OPPO Digital PM-3 planar magnetics at $399 per set. Astounding headphones, all. I also have been buying Koss Portapros for my hi-res FiiO X5, which sound great. There's your reference. I will say for $49 these new Koss UR42i headphones, I believe, will knock off the Portapros and start a new tradition. My first audition was Diana Krall, early trio work with piano, guitar, and bass, and vocals. for $49 you're getting 80% of the OPPO Digitals for 12% of the price. Well made, fantastic sound quality, and replaceable cable, which is the first and usually only thing to go on beater headphones. Run, don't walk, and get a set of these.
Review by AudioJazzguy /
(Posted on 10/30/2016)
Excellent performer hits way out of price league
Overall
These closed back, circumaural headphones are an upgrade to the UR22, rather than a continuation of the semi-open style of the original UR40. Soundwise, these share a similar profile to the LX elements (Pro 4S, SP330 etc), leaning more toward smooth roll off of the SP330 rather than the signature dual band (low and mid) signature that the 4S features. More fundamentally, they have added what appear to be 3 vent slots to the top of the enclosure that cleans out the lower bass bloat that was a bit too prevalent on the LX circumaurals.
The dual hinge headband is a nice inclusion. Not only does it allow folding flat for storage, but it keeps the microphonics from the rigid headband to a minimum (headband creak was a serious drawback on the UR22). The one major criticism I have is that the headband lacks any padding on the top section like on the similar SP330s - this makes the cans a bit uncomfortable for longer sessions if you have a larger head like my own; smaller headed folks should be fine as the headset is designed to rest primarily via the horizontal clamping force.
Finally, I cannot emphasize how much I love to see a detachable cable on a sub $100 pair of headphones. Bravo Koss! The fact that they use standard 3.5mm connections on either end means one can take this single touch mic cord and use it on any of the Pro DJ, Pro 4S, SP330/540 etc.
Review by Ian /
(Posted on 10/29/2016)
20-20,000 Hz 
35 Ohms 
100 dB SPL 
4 foot 
Limited Lifetime Warranty 
John C. Koss, Founder