I have an Gemini 2 and for me the EmPower make all the difference, really.
My Kemper is unpowered model, so i using the main output in Stereo.
i don't like the tone harsh of just be FRFR (i tried it with Class D PA Loudspeaker, high quality)
I like the tone of the real 2x12 closed cab trough and seperated Tube amp, but i losing all superb details of the FRFR when mid gain, low gain and clean profiles.
So
Gemini fix this by giving us a adjustment, the EmPower, mine is set at 70% FRFR, and it became perfect blend to me.
When the Gemini is at 100% FRFR (flat), the tone is a bit too harsh (trebless), but the sound is dispersing very well vs PA Loudspeaker.
When the Gemini is at 0% like guitar cabinet, it is like guitar cabinet, more mid, less treble,
For me this is the reason why i selected Gemini 2, the Empower adjustment vs buy Blueamp with on-off switch FRFR-GFR, RedSound or Friedman ASC12
and it is stereo, this is a plus.
Do get me wrong, Bleuamp, RedSound and Friedman are very good stuff, better in my eye than any PA Loudspeaker.
I am use to play Hi-Gain Mesa amp, and i like it when it loud and wide dispersion when playing Live.
Gemini 2 does it, loud, nice hi-gain tone and dispersion, you can feel it and it is so clean at the same time.
As i mentioned in a other post, for me, my search for a perfect match with Kemper is completed, done, finito, that it.
And i am extremely satisfied.