I usually place my active Blueamp Spark FRFR-Cab on a stand focused on my ears. That is why I miss these Low frequencies you get when an amp is based on the floor or the stage. ?
Although it is not flat anymore I would like to use and adjust the bassboost of the cone-site of the kemper without changing the other frequencies to fit the cone imprint.
With the cone-imprint the Spark Cab does not sound as good as without. No surprise at all. But the Spark (or any other active cab) with the adjustable Bassboost could be awesome. 
Keep on kemping!