^Exactly!! I was really surprised at how harsh, even shrill, the high end can be as the volume level increases with the CLRs. You think you've dialed them in at normal performance level and then if, for whatever reason you exceed that to any significant degree, the sound characteristics change in a bad way. All attributable to fletcher-munson I assume.
Whereas with a traditional cab, the harder you push it the characteristics change in a different (better) way. You get a rounder, squishy-er tone. When I used to play my Triaxis/2:90/Cab rig, I used to love it when we turned up loud, 'cause that's when the magic really happened between the 2:90 and the speaker cab. With FRFR, it's just the opposite, I'm always trying to keep our stage volume down, so I keep my CLRs in their sweet spot.
Not sure if that makes any sense.