So maybe its the source material I listen to, but I find my THX has lots of bass, shakes the outside mirrors etc.
I like the non-surround mode better. I think the surround mode sounds a bit muddier, muffled etc.
I have my Bass slider about three clicks +, Midrange a click or two + and Highs about three to four +.
I had the premium Sony in my Limited 2012 Edge with dedicated sub etc., and it rocked out very well. I agree that the actual volume slider/range seems to need to be much higher to get it loud, but I still have plenty of room to go louder and again, I find the bass very satisfying. And I do consider my self an Audiophile. I do the HomeTheater deal with Aperion, SVS, Denon, Emotiva, Oppo etc. Am a Tech Geek.
After hearing the comments some of you made about the lack of bass in the THX I debating getting it in my MKC. We literally sat in two MKCs side by side jumping back and forth listening to each system with the same USB source. I chose the THX.
Rayo