These headphones had to prove etc. for several days against competitors from Sennheiser, Philips. Strict comparison was an elderly AKG K500 (open system) and the current AKG K 550 (closed system). One thing first: What one finds in test magazines and on the Internet to the 'great sounds' from Philips or Sennheiser is incomprehensible. Tested on a hi-fi system and MP3 players comes just over a AKG always convincing natural sound and an unrivaled spaciousness. Never shall the bass to the fore so that it cuts the mids and highs. Philips Fidelio L1 produced locally to stand right next to a bass box the physically palpable sense. So what does this have to do but with good and natural Klnag? The spatiality of bands or entire orchestra shrank to a little more than at the center of both membranes. AKG creates here feel right in front of a wide expansive Orchesetr to sit, the singer comes out free and clear differenzeirt, can breathe. Despite its semi-open design do not overdo it with the bass and AKG, which also pleased the sound effect is hardly given to the outside. So it remains undisturbed in his music enjoyment and does not bother anyone. Processing ... Well, it is made entirely of Kunstsoff. Nevertheless, it is very stable, nothing knarrzt and he wears wonderfully light. Together with its low weight and the good earpads to forget him after a few minutes. People no longer feel it and only hear music in good quality. In some songs, the music schaftte the AKG even noises such as musical chairs, turning the notes or the finger slide on guitar strings, so clearly bring out that one is surprised. The schaftte none of the other competitors (except from AKG itself). Unfortunately I had to give it away. But this with a clear conscience. Highly Recommended. Especially at the fair price.