Horns with good timbre and tonality?

I also suggest you try the Volti Audio Rivals w/ your set up. I owned & enjoyed Avantgardes ( first Unos & then Duos) w/ Art Audio amps for several years & they’re very good in many ways although quite directional, didn't image that well & tricky to integrate their own powered subs. 
 

The Rivals are overall more enjoyable & sound more like live music to me . They’re easy to set up& get sounding very good, not crazy big or crazy expensive. They can easily fill a big room w/ not that many good watts.  Worth a listen.

I have heared Blumenhofer fs 2 .  They sounds good but for me nothing special for

that price.  I have decided now for Zingali speakers Quantum array 3.8

I think , Zingali is better than Blumenhofer.

@audiokinesis --

Thanks for your insights and pointing to actual mechanisms that to you are vital to achieve a more natural timbre. 

(addressed by you to the OP)

You mentioned full scale symphony. The ability to convey the hall ambience on a good recording again goes back to getting the reflection field correct, as the in-room reflections are in effect the "carriers" for the reverberation tails on the recording. I can go into more detail about this if you’d like.

I'm certainly all ears for an elaboration here. 

Coherent Audio Eighteen...

Volti fan here! Razz or Rival's are simply awesome. 

I viewed a used pair of Vittora not to long ago, I cant recall if it was here on AG or USAM. If I had the dough I would have jumped on them. Unfortunately they are a bit out of my reach right now.