I have just acquired one of these amps, and I find it is boomier than my MarkBass 2x10 combo.
I spent this morning experimenting with the parametric EQ in my Helix HX Effects to good effect. I set a couple of parametric to cut various frequencies below 40hz. I am going to try this at various volumes, but initial results are very promising. Everything just sounds higher and more focussed.