When I listened to the Dynaudios with the Prologue, it was in a medium small listening room as I recall, about 15x20x8. At normal listening levels to volumes high enough to chase the sales person out of the room the sound remained coherent.
The Focus 140 has the same sensitivity as the Audience 52/52SE so it should perform similarly, but with perhaps a bit more resolution. I have listened to these through an ARC tube amp, and they sounded and looked beautiful. My guess is that the P2 power supply is big enough to drive the 140s at moderate volumes in a medium sized room at 4 ohms without breaking a sweat, although I haven't heard this particular combination.
The Focus 140 has the same sensitivity as the Audience 52/52SE so it should perform similarly, but with perhaps a bit more resolution. I have listened to these through an ARC tube amp, and they sounded and looked beautiful. My guess is that the P2 power supply is big enough to drive the 140s at moderate volumes in a medium sized room at 4 ohms without breaking a sweat, although I haven't heard this particular combination.