Dynamic element design for deep bass performance; Comfort zone setting on temporal pad for comfortable, secure fit; Multi-pivoting earplates and adjustable headband for added comfort; Collapsible for maximum portability when listening on the go; Includes convenient carrying case; Straight, dual entry 4 foot cord; Frequency response: 15-25,000 Hz.

Great frequency response, including deep bass performance

Comfort Zone setting lets you adjust temporal pad for a comfortable, secure fit

Collapsible for maximum portability when listening on the go

Multipivoting ear plates and adjustable headband for added comfort

Includes convenient carrying case

Average Customer Review: ( 1196 customer reviews )
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These phones may sound a little bass-heavy to some, but this unit has temple-pads that lift the elements away from your ears. This not only improves comfort, but also attenuates the bass, leading to a nice mix of comfort and sound quality.

Also, since I tend to be a bit rough on phones, the lifetime warranty has come in handy a few times.

128 of 132 found the following review helpful:

Great for TravelMay 13, 2001
By Elderbear
I've worn out two pair of these phones in the last decade. The sound quality was great. Wonderful bass--the only phones with better have been phones that fully cover my ears--and aren't really "portable." These stayed comfortable for the excruciatingly long flights from SoCal to northern Norway, even while wearing glasses. They fold up nice and small, easy to tuck away. They also performed adequately while watching airline movies ... more than saved the price of the phones over several trips!

I have two complaints: 1) hair easily penetrates the "speaker grill" and makes irritating noise against the actual speaker membrane. 2) The speaker, while reproducing sound well, can develop tears in the membrane easily. BE CAREFUL! Nothing is more annoying than a buzzing speaker at 33,000 feet (well, perhaps sudden cabin depressurization ...)!

My second pair wore out about the same time as my vintage walkman. I replaced the setup with a Nomad II MG & a pair of noise cancelling headphones--they make a _huge_ difference!

Five stars for sound quality. Five stars for comfort. Five stars for portability. Five stars for durability. If you're not going to spring for noise cancellation and you need a folding pair of phones, then get a pair of PortaPros.

66 of 70 found the following review helpful:

The best design for pocket-carryingOct 25, 1999
By Jeffrey N. Massie
These phones collapse into a package tight enough to fit in a jacket pocket, yet they expand enough to comfortably fit my size-13 head. The earpieces loop around the upperedge of the ear and are quite comfortable. They have the best sound of any portable headphones I've ever used -- well worth spending extra to replace the crappy ones that come with most Walkmans. One complaint: the hook that is supposed to hold them into a ball springs open much too easily, and the cord snarls if it's wrapped around them.

37 of 38 found the following review helpful:

My set is 15 years old and still sounds greatMar 20, 2004
By plug_it
After reading a few of these reviews which say these headphones are cheaply constructed, I had to post. As I type this I am listening to my set of Koss Porta-Pro I headphones which I purchased in 1989 and have been carrying all over the world with me ever since. They still sound awesome, and the only reason I logged onto Amazon.com to purchase a replacement is that the two large pieces of foam, which rest against the temples, have long since worn away and I thought it might be interesting to have that foam back.

While they might look fragile, I don't believe they are. When folded up, they seem to resist destruction very well indeed! Mine came with some kind of carrying case but I lost this over a decade ago and the headphones are usually just chucked in my bag and away we go. Or they are lying around my room, or tossed in a drawer full of junk with no protection. I use them constantly and the only thing I've done to them is to replace the ear foam numerous times over the years with earpiece foam from Radio Shack.

I have found that if one side or another begins buzzing, the problem has always been debris between the speaker and the inside of the foam earpieces. This begins to happen when the foam deteriorates and breaks up, but all that is required to restore sound quality is to remove the foam, vacuum the debris (crumbled foam or bits of human hair (gross)) out of the earpieces and reassemble with new foam for best results.

These headphones are awesome. People are always telling me they're the best sounding headphones those people have ever encountered, and it's a fact. You will not be the least bit unhappy with these.

BTW I do not listen to music quietly, I blare it. I suppose they are not as good as some other headphones at confining the sound to just the wearer, and for this they might not be the best choice on a plane or train. But as many times as I have overloaded them in 15 years of use, they have not blown.

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