I have a Swart AST head. It has some very nice sounds but, to me at least, it doesn't have quite enough clean headroom to play in a band situation. I didn't buy the Swart speaker cabinet to pair with it. Perhaps I should have? I have often wondered if a cabinet with an efficient speaker might be the solution. I do have a DRRI which is what I mostly use. It has the headroom and strong bottom end to fill my needs, but of course I use pedals with it.