super DAC and headphone amplifier strong

I own the dragonfly now three months and definitely not give it ago. Opposite the v1.0 manufacturer was lt. Improves inter alia the headphone amplifier. Although I can not compare with the old version, but: The Dragonfly offers more than enough power.
The AKG K450 (32 Ohm) I hear most often only at the lowest level, a level down would be "sound off". The volume knob of each playback program, iTunes or Spotify about, is always at the highest level to give any resolution.

Excited I was to the test with my new Beyerdynamic T90, the somewhat more calls with 250 ohms, but is considered by the Tesla drive as efficiently. Since I use the Dragonfly mainly at home, I have drawn an external headphone amplifier into consideration. But that is not necessary in the case of the T90 - depending on the recording is enough also here a very low adjusting the volume. Even in "quieter" classical recordings, the dragonfly has a lot of power reserve (about 50-60%).