none

No bass at all, too much high frequencies, lots of sound leak

These headphones seemed to be of good quality, since they
were made by Koss. But what a disappoitment! These headphones don't have any bass at all. Higher frequencies instead make ears bleed. And I wouldn't use these one
in public places either, since the sound leakage is terrible!

What a waste of money.
Don't spend your money on this lousy product.