funknflexAccording to amazon reviews, it drives HD650's and Beyerdynamic T90's, both headphones with higher impedences, very well.
I joined the purpleheart drop and was looking for a great DAC/amp to pair it with. This seems like a nice fit.
ShillThe HD 650 comes maybe with a high impedance, but it is also very efficient. I would recommend to check the specs of both this dac and the headphone to make sure it will deliver enough power to move it.