Is there a difference in sound quality if I set the volume directly on the headphone amp versus keeping the headphone amp volume relatively high and setting the volume via the DAC? I want to buy a DAC and amp and I need to use a remote to set the volume (these things have to be out of reach...

I am planning on buying Sennheiser HD600 headphones. I don’t have a dedicated headphone amp, but I do have an integrated amp (Arcam A85). This amp’s headphone jack is fed from the output of the main power amplifiers and it’s output impedance is 77 ohms. My main question is: Will I have any...