High quality material - with manipulated sound amplifier

High-quality hardware, but: the knobs to the shells seem to very much inferior. One constantly has the Gwefühl, the buttons fall out equal. Without a normal headphone amplifiers, with amplifier similar to the Windows Media Player with the 'SRS Wow effects. " Especially the bass are totally manipulated; This sounds at first quite bold, but loses some titles almost not again any charm that you can see a lot of songs. With amplifier therefore rather a "Remix" headphones, as a serious hearing. Without amplifier with Android / iPhone to weak ones belongings. Even with the price of just over 100 here at Amazon a too bad price / performance ratio. I have returned the headphones again.