ckemper thanks you for your valuable input as always. I always value your insight and knowledge as I am sure others do.
You might want to update this section of the manual then
KEMPER PROFILER Main Manual 7.5
Why do I need my guitar cabinet when I want to capture a PROFILE without a cabinet?
It's true, the sound of the speaker will not be captured in this case, but the complex impedance behavior of the
speaker is still needed to create those oft-mentioned interactions between the power tube amp and the connected
guitar cabinet. The DI box will ensure that there are real-life interactions for the PROFILING process to capture.
Later, when the PROFILE is played back through the built-in Class D power amp, or an external solid-state power
amp, it will recreate the same impedance situation to that of the connected guitar cabinet. This is the key to making our built-in power amp sound like a tube power amp.
For this reason, we recommend that you don't use any kind of
power-soaks or power-attenuators, either as a substitute for, or in addition to, the DI box and true speaker. Those
devices work mostly with simple resistors, which might inhibit the desired impedance interactions, thereby resulting
in an inauthentic PROFILE.