@OP You are up against the laws of physics. You can make a small speaker play loud, but scale requires the ability to move a lot of air. So if you want concert level spl's and scale, a small two way just will not cut it. The closest to achieving that goal - at a price - that I've heard is the Borresen 01.
If you absolutely have to have a small form factor speaker, the Neumann 310 might work - its a studio monitor, a three way in a pretty compact cabinet. Like most studio monitors, it's active.
But really you would be better with a bigger three way floorstander. An 18 inch drive unit is not really designed to go up into the midbass, so you would be better off with a three way.