The first thing to clarify (because of other reviews) which is not the HD7: He is not a hi-fi headphones, nor similar for connection to MP3 players, Walkman thought. What is the HD7: He is a professional monitoring headphones for recording studios. Of these HD7 I've run in my studio 14 pieces and every day for some few years. And without significant wear. The HD7 from American Audio hardware and software manufacturer Presonus, is characterized by its linear frequency response from similar at Refernzmonitlautsprechern in studios. In other words, it "colors" the sound does not, but gives it back straight and very detailed. That's why I use him for Vormixen a song or poor song parts and then do the "fine tuning" of the great studio monitors. With its frequency response of 10Hz to 30KHz it is both the bass very well again, as well as the highs. The HD7 is very comfortable, even after prolonged operation and is around the ear. For larger ears, however, it can sometimes push a little. Due to its semi-open design has to be do not feel completely cut off from the outside world as it is sometimes the case with closed systems. The connection adapter of 3.5 to 6.3 mm stereo jack is gold-plated and is simply screwed, so you can not lose the adapter. A very good feature!
All in all I'm very pleased with the HD7 and each of its operating range it (studio) is used, it will be the same. Expensive is not always better!
