Koss PortaPro Headphones with Case

At first listening the Koss Porta Pro is a warm open sounding headphones with reasonable comfort depending on head size and ear sensitivity.
I liked the retro style and compact design is great for travel.
Specs are impressive for a lightweight headphone.
Cord: Straight Dual entry 4ft
Distortion: < 0.2%
Impedance: 60 Ohms (at 1kHz)
Plug: 3.5mm/6.4mm
Sensitivity: 101 dB SPL/1mW
Weight: 60g

Bass is definitely the Koss's forte with mids slightly overshadowed by the bass giving it a muddy tonality at times with a over extended treble. A typical V shaped sound and enjoyable to the beginner enthusiast because of the value and decent enough signature.

Honestly it's easy to forgive the flaws and remember this little headphone has been in production for a long time now.
Though the standards have definitely gone up since it was introduced many years ago and it still holds it's own against many budget competitors by living up to it's bang for buck reputation and a cool retro styling.

In conclusion this is not a bad product it's not up to standards of newer audio products that I've tried but it's still a decent sounding pair of headphones if not a little overhyped.

I have had my PortaPro headphones for almost 15 years. Other than the pads disingrating they have held remarkably well. To me the design is classic, some call it retro. They fold up very nice to stow away. The headband is adjustable so you can wear them tight or soft, as well as ithe band is adjustable. This makes it a bit mor secure than other ones that do not adjust, and much better than the KSC75 ear clips, which by the way I also own. The lifetime warranty simply beats other ultra light headphones, which is nice to have.
Now for the sound, these little gems do good all up and down the spectrum. Bass is a bit heavy and not the most detailed. I would label them on the dark ide of neutral. The treble is laid back, but not the point where they scrubbing details. Clarity over all is very good. The midrange really shines nicely. Compared to my KSC75 phones, not as detailed, more bass. Compared to my IEMs well the portapro has no isolation in or out. If you are walking or other places where you need to hear the outside world that is a good thing. My IEM are from the old before bankruptcy Radio Shack, the entry level Auras line with a moving armature design. To me the the IEMs have better detail, but not as much bass as the PortaPro models. Bass heads will like these phones. Classical or acoustic fans may not like them as much.
The soundstage is very good, AS the layers of music you can pull out. Not in the league as my ESP-950 headphones, as to me they are the best I have heard. They are much better than my old Grado 60's I used to have. The grado's really lacked in bass and visceral presentation, but a bit more detailed. The Grado's are bright to me, not as comfortable, and do not fold up as well. The Grado phones are better built, heavier and thicker cables. The PortaPro phones are some what flimsy in comparison.
So there you have review, not giant killers compared to full size phones, but for the under $50 market may be king of the field. As I am writing this, I am using them listening to Fleetwood Mac.

Well, I´m not a pro, just an enthusiast, an owner of some good cans, so i won´t write a review, just share a couple of thoughts about this amazing little thing. Koss Portapro is something what you have to have even if you don´t need it. Just as in my case, I´ve got several pair of cans, but when i saw the Koss in a nice small audio store in NYC, i immediately bought it, just out of curiousity.It turned out to be a great decision... Especially because i paid less than 34 dollars for it. I tried it immediately with my Fiio X3, and i was blown away. Basically, i didn´t have too high expectations, from such a cheap thing, but what i got, was waaay above what i expected. First of all, the looks. Very old school, I like it, but of course it may not be everyone´s choice. Comfort: great. So light, the soft pads sit on your ears very nicely, really nothing to complain about. And most importantly, the sound.I was surprised how good these little cans were straight out of the box. After a few weeks of listening, my impressions are: if You are a "squarehead hifi maniac", don´t even consider buying Koss PortaPro. These cans have their own limits, but what´s left is, sweet as sugar. I always think about PortaPro like an instrument, rather than a pair of headphones. It has it´s own signature, nice, deep bass (surprisingly great from such a small thing), a very listenable, warm, sweet middle, and pretty good highs as well. A pure joy to listen to, nothing more than that. It doesn´t go really deep, or really high, but what it gives you, is a very special, characteristic approach to the music, a superb presentation. So, if you need a small, foldable, easy-to-carry set of cans, with sweet, joyful sound, don´t even hesitate. Just go, buy it, you won´t regret at all. Well, i should mention the cons too. Nowadays in-line controls are a must, but this is a classic model, I can live without it. (in the meantime i switched from X3 to X3 2nd gen, which does have in-line controls). The carry bag included in the box is pretty bad quality, and simply too small even for this pretty little thing. And, of course it leaks sound, so not the best for commuting, if you listen to your music very loud. But, for less than 34 bucks, i don´t mind these issues, and you wouldn´t either. Just go, buy, and enjoy.