"Popping the DacAmp into 'high gain' I'm able to drive higher impedance headphones such as the 300ohm HD600 and 250ohm Beyer DT880 without even kicking a fuss, Granted, I may need to pump the volume pot to about half way but the main concern here is driving power and how much authority the amp supports these headphones with. I can say it passes in flying colours with tight bass and no stage compression often found with underpowered headphones."
wow, according to this , you are in good heands
Cheers
Lee