my VTM sounded insane through a XXX 4x12..it made my 6505+ sound like poopy.
When I bought my Engl Fireball, I tried some different cabs at different stores, and to be honest, I loved how the Fireball sounded on top of the XXX 4x12. A lot better than the 2x12 Celestion CL80 loaded cab that I ended up ordering from Avatar.
Cole