Having recently progressed through stages of mods to a BAT VK tube amp, I've heard the qualities of which you speak all improve together in the same amplifier driving the same speakers. It's particularly interesting to me that soundstage size & depth-of-field are as much a product of improvements to the amp's electronics as they are a result of speaker placement or room effects. Deep-hall effects are revealed in the far corners, but the performance also moves forward of the speakers toward the listener. The amp improves in its ability to retain accurate frequency balance & dynamics at reduced volume. Finally, the qualities of grainlessness, smoothness, warmth & relaxation, are in no way unreconciled to improvements in treble resolution & air, and punch. Great dynamics is the quality that binds everything together. It fits the instrument's body within the boundary of its image & delivers impact approaching live performance. You sense that it's the intruments that are jumping, not the amplifier. The acid test for live performance is bass control. Almost all amps fail to communicate accurate texture in the bass region.