I just found this link - while searching for Kemper and acoustic - seems to be some sientific study on the Kemper.
I wonder if anyone heard about this and what might be the the results...
Herbst, Jan, Reuter, Christoph, Czedik-Eysenberg, Isabella, Gressel, Eric, and Brümmer, Benjamin. “Kemper Profiling amplifier. An acoustic test of original and profile and consequences for music producing”.