Since a lot of our users are into matching the Kemper with a traditional guitar cabinet, I just thought I'd put across this suggestion:
Disable the EQ as well as the cabinet in order to achieve best results. This will allow the sound of the cabinet to shine through without additional colouring at the Kemper Amplifier's end. 
Alternatively, use the EQ as your friend to tweak the sound of the amplifier before it hits the cabinet.
Just thought this was an alternative way of looking at running the KPA into a cabinet, given that most of us always suggest, "Turn the cabinet off" 