What generates rich timbre out in the real world?
Well, what makes your voice sound richer in the shower?
What makes a grand piano’s timbre and texture so rich and lush in a good recital hall?
And what makes the difference between a good seat and a crappy seat in a concert hall?
The reverberant field.
Get the reverberant field right, without screwing up the first-arrival sound, and you will have rich timbre. The best speakers for that may differ from one room to the next. But unless you listen nearfield, most of the sound that reaches your ears is reverberant sound. You don’t get directional cues from the reverberant sound because of the precedence effect, but the reverberant field plays a major if not dominant role in just about everything else.
Exactly what is involved in "getting the reverberant field right" is a big topic and well beyond the scope of this post, but awareness that the reverberant field matters is a crucial first step. It is not the only thing that matters, but it is one of the more important ones, especially if rich and natural-sounding timbre is a high priority.
Duke
dealer/manufacturer