I'm not a fan of the LM4481 opamp used in the PA2V2, it has distortion curves that have a steep ramp up either side of 1 Khz. Being powered by 2 AA batteries and not having a DC to DC upconverter I doubt that the PA2V2 can properly drive a pair of HD600's. A reasonably priced desktop amp would be a Schiit Magni or if a portable is needed a FiiO E12 would work out well.
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