Well, this is not directly on point, but I have a P5210 combo, and it is extremely loud for a compact 2x10 rig. In fact, I believe that I could probably cover most of my gigs with this head (FWIW, one guitar player, and a relatively quiet drummer). That being said, for our larger gigs, or outdoor gigs, or any time where I don't have good PA support, this rig might not be quite enough, and I would think that a P5110 with a similar size extension cab would fare similarly.
On the whole, though, the Promethean head and combos are very impressive, in my book.
