Best Loudspeakers for Rich Timbre?

Yes who are all these characters, Rich Timbre, Impedance and THD? What is their relationship with reproduced sound quality?

It's funny how so many simple things aren't really very simple at all once you start to have a closer look. 

There was rich timbre of all kinds all over the place at CAF yesterday though a lot but not all happened to cost a pretty penny.

Rich timbre is not rare. Most any well integrated system set up well can do it. Which is best? I think that may be a rhetorical question more so than anything that can be established with any certainty.

I did hear at least three systems yesterday that did rich timbe very well with speakers under a grand: Vanatoo (two years in a row), KEF, and Quad. Between KEF and Quad the Brits did quite well yesterday offering really good sound for not much cost.

Your argument that apogee would sound better if it were higher impedance is false based on imperial evidence.  Case in point the 1 ohm Schintilla sounded better than 4 ohm Schintilla, as long as you could find an amp that could drive 1 ohm load.  

@dracule1
I think you missed my point. As far as I know, there isn't any empirical evidence, because there is no way to make a four ohm speaker magically 8 ohms or more because the design would be different.
I'm looking at this from the point of view of the amplifier, which will sound the best if its distortion is kept to a minimum, and that is done only when the amp drives a higher impedance.
The idea is to avoid the brightness and harshness which is how the ear interprets small amounts of higher ordered harmonic distortion, as well as increased intermodulation distortion. The only way to do that is to have the amp drive a higher impedance. You can't get rid of it by turning down the treble since the brightness is caused by distortion, not frequency response. You can turn down the treble and brightness is still there.

You and I are both not convinced by our rooms at RMAF and the like. We've only gotten sound I really liked at a show twice- once was in Munich, and the other was at THE Show many years ago in Las Vegas.

I hope my DeVore O/93’s are on your list of the speakers that meet your preferred characteristics.

@fsonicsmith

I like them a lot; every time I've heard them they were very convincing. They are a good example of what happens when a speaker is easier to drive.

Atmasphere, seems like you’re claiming no amplifier designer knows how to design an amp that will be just as good driving a 4 ohm load as driving an 8 ohm load. Am I correct? I don’t think you speak for all amplifier designers out there.

Apogee did “magically” make a 1 ohm and 4 ohm version of the Scintilla.  There are other speaker manufacturers who make different impedance versions of the same model (eg, Tekton).