@ SgtPepper, Thank you for your response!
yes I'm looking to get closer to a cabinet loaded with Celestion Creambacks G12M 65's.. but with a full range monitor.. QSC K8.2's as my stage monitor and not a guitar cabinet..
The G12-65's have a range of around 80 to 5K as you've stated.. so it'd make sense at least to me to roll them off somewhere around 5k.. and tweak them based on lead or cleanliness desired..
I also use a set of vintage Altec Lansing 417C's which have a range of 60 to 8K.. beautifully wonderful tone.. because they have the greater range compared to the G12-65's, I tend to roll off higher to obtain some of the brightness of the Altecs..
I mainly use the 10 band portion of the eq to enhance a frequency range to obtain punch to the tone for the desired need..
Lately I've been fiddling with the shelf to find new sweet spots.. there's always something new to learn with the Kemper.. I've been playing my Two-Rock 10th Anniversary J2 and Blackface Princeton Reverb a lot over the past year and now back on the Kemper.. its always nice to reground one's self... so to speak.