I've had a Kemper for a while, but I'm just now trying to profile an amp. It is a 68 plexi clone. I'm not getting the expected results. In my case, I'm trying to profile everything except for the speaker cab.
Here's my setup:
Amp->Suhr Reactive Load->Kemper return
Kemper send->amp input
Kemper mains left out->matrix power amp->4x12
The amp has the post phase-inverter master at noon, presence at noon, and everything else cranked.
I set the input level for the profile to match other know good profiles and do the profile. I check be box for skipping the speaker.
I use the matrix amp and 4x12 to compare results. I make sure the speaker button is turned off on the profiler. What I end up with sounds like it has a low pass filter of some sort, kind of like playing through a cocked wah.