If you are questioning the ability of the fulla 2 to drive High impedance cans, I am Currently Driving Beyerdynamic, DT990 600 Ohm HP's with the Fulla 2. With Albums that are recorded on the louder side, it is way more than enough. Volume at 12 o clock is getting a little to loud. With Albums that are not loudness" Enhanced " You will need to get it up near the 3- 4 O clock position for a loud enough to enjoy but not loud enough to hurt level. The DT990's are meant to pair with My Valhalla 2 Once the Freya comes out, but I was curious.