I recently bought a pair of ath m50 and given that I have turn my onboard laptop volume to the max to just get a satisfying hearing level, I decided to buy a fiio E7 to boost the volume and quality of the sound. But surprisingly, I don't hear much difference in the loudness of the sound coming from my ath m50. My sources are mp3 files and youtube music videos. I turned the volume to max on both windows media player and to the highest 60 on Fiio E7, but still on many songs, I feel the volume is nowhere near the deafening level I would expect. Right now I am looking at the audioengine D1 DAC. Should I return my Fiio E7 and buy it instead? Will the audioengine DAC produce louder sound?