May sound silly, but i run my KPA into my Peavey 5150 FX return, into a old Marshall 4x12.
The tube amp seems to help round off the sharp edges. No sense in spending money on a Amp for the Kemper,
When i have 2 perfectly good tube heads that can handle and gig i have. I'm old, i still need to feel the guitar while i play.. sorry IEM guys.