"Try those using your powerhead straight into your cab". Isn't it always the case? ... Like, also with the powered Kemper? ...
Not sure where my other post went but I answered this. No I'm not using my Kemper theough my amps power section for anything but creating the profile.
After creating a DI or merged profile, turn off the cab on the Kemper monitor output. Then EQ the monitor out while playing through a solid state power amp and your cab while at the same time sending a mono main out to good FRFR.
The sound from the FRFR is what your profiled amp sounds like through the microphone you chose to profile with. Use this sound to help EQ your cabless monitor out to the power amp and cab.
You should be able to get pretty much a spot on match to your amp played through your cab. You have to EQ a guitar cab to get an exact match, guitar speakers color the sound. It will be close without the EQ and likely usable but not exact until you EQ. The Kemper was always intended to be used with FRFR or flat stage monitors, but they listened to the users to allow a way to use your own guitar cabs so people didnt have to spend good money on a FRFR cab or PA.
Hopefully that makes sense and explains what I do and what I'm talking about.