I opted for the 80 Ohm version I hautsächlich to my sound card using the headset (ASUS Xonar D2X) and did not have any headphone amplifier. Since the sound card very good sound quality features, the headphones are an ideal complement here. At the first use is immediately apparent, everything sounds very harmonious. Treble, mid and lows all come out very well but are never intrusive. I am absolutely thrilled! Unfortunately, this sensitivity bingt also means that even the smallest errors recording becomes immediately apparent. One should therefore use only hochqualitätives audio. The level stability is madness before the 770 PRO is reaching its limits give my ears to. And even under these conditions all crystal clear is reproduced.
The processing of the headphone is good in my eyes, but not perfect. The ear cups that completely surround the ears, consisting of a single Plasikschale and look a bit cheap to me. The steel straps because geanu the contrary, they are actually bent a perfect fit and fit perfectly to the user's head. In my opinion, however, with a little too much pressure. Maybe I still have to get used for an even longer gestation period (1-2 hours) I have the headphones ever decline for 5 min.
All in all I can only recommend the Beyerdynamic DT 770 PRO ....
Edit: 2 years, the headphones now with me almost daily use. Despite several falls from my desk to the floor he has not otherwise taken damage not phonetically. Works like on the first day (as of 10/01/12).