I really dig the MT 15 through my Mesa vertical 2x12 cabs with V30's and backs removed. I also enjoy it through a 2015 PRS 1x12 closed-back cabinet that also has a V30. I don't really care for it through an open-back wide-mouth Mesa with the Black Shadow. I *suspect* that the amp prefers a closed cabinet so the lows can percolate. I'm hoping to get a chance this week to A/B/C/D my cabs, the MT15 cab, and the Mesa recto slant 1x12. Thoughts? What are you guys using?