Moin, haydewitzka what a grottiger headphones could, action 179, it in - get hold of something bad and I have long not heard, dull and Mumpf, no brilliance, sitting very uncomfortable at the head, the ear pads heat ear out massively. At first I thought it was still a protective film on it, as the sound especially in the higher frequency range no local presence, the bass is very strong for this exists. The NC has a very low filtration rate, absolutely not comparable with Bose, so do not expect too much. I am very surprised because Denon is actually known for higher quality products and has also very good headphones on offer, but this is real here underground, unfortunately !!! The processing is more likely in the range of 100 - headphones. In addition, the KH acts very cheap, because the paint is not particularly high, after a short while, this rubs off. In addition, the choice of materials is to be found rather in the plastic range in the direction RRP 500, - you can usually expect a lot more Very very bad!