ARC On-Ear Output Vol very low

Trying to get ARC ON-EAR setup. So far so things look good but am getting very low output levels from AKG K240 Studio cans. Like -25dB lower than input. I have to crank the Vol knob 3/4 to full up. Connected via USB

My AT M50s seem normal.

Any comments, suggestions, observations. I even tried cranking the three bands all up 12dB and Vol knob full on and output was still well below the input.