I recently get a Meridian Explorer as a DAC for my desktop use, also want to buy a open back headphones to take the advantage of high rez music. Right now I am considering Sennheiser HD 650, AKG K712, or Hifiman HE400. I am relatively new to the open back cans. Any advice will be good for choose among those three.
Meridian Explorer is already a DAC and AMP, but I am worried about if it can properly power those headphones since its USB powered. A maybe $200-300 amp will be better? If its just a tiny bit better, I would not spend the extra 200-300.