The short time I had together with the pair (U12’s were from the tour), was quite nice. The bass was tight and fairly deep reaching (to me a bit better controlled than the U18t). The mids were a very nice tie between the bass and treble, as in not overpowering. Nice support. And as for the treble, I found the U12t more listenable than the Forte, which FOR ME, was a bit harsh. I really, really liked the U12t/xDSD pairing. I am lucky to have the UM Mason V3 right the now, but have not had time to hook up the xDSD with them. Hope this helps.