@ Lacee, specifically with respect to 'synergy'. Agree that as you state 'To me, the ultimate synergy is when the whole becomes one.' which is a nice summation of complete synergy, I suppose. If I infer correctly that that statement is referring to the end listening experience, then it would have to include the room as well.
Certain simple, fundamental starting blocks for synergy: ensuring that output/input impedances match spec-wise. That your amp and speakers are well matched (ie amp not underpowered, or perhaps a low-powered amp designed for crossoverless high efficiency speakers). Maybe buying all the same brand of components. Speaking to the manufacturer of the various components in your system and garnering their opinions and others on equipment matching (hence the bajillions of 'what type of X goes best with Y?' posts).
Beyond the obvious, there are simply times when components work better with some than others. Cabling, etc is also true of this. My synergy comment was meant only as a baseline. Beyond that, IMO Class D vs A comes down to a personal thing, and in the right setup can sound fantastic.
I hope nobody out there writes off Class D as a whole based on others' blanket statements without hearing at least a few different class D amps in their own listening room.
