The best speaker you ever heard?


In my opinion, the speaker is by far the most important part of the audio system. After all, it is the only part you hear. OK, the other stuff really matters a lot, but without a great speaker... No go.

I am a bit 'speaker-obsessed' I guess, and now I am wondering: What are the best speakers you have ever heard, and what made them the best?
njonker
Dali Epicon 6 driven by Simaudio and Nordost Cables. I was dumbfounded. Absolutely Holographic. 
not the best I've heard as that's the model two up in the line, but I have Vandersteen Quatro CT in Audi Havana Black paint coming home in the next week or two.  CAn't wait.
Vandersteen Seven Mk II with Aesthetix Calypso Eclipse pre, Aesthetix Romulus Signature CD player, Aesthetix Atlas Signature
Wow, that's one heck of a set up. Heard it many times and absolutely love that combo better than any of the AR electronics.
The best speakers to my ears were the Focal Diablo Utopias running from Devialet Expert 220 Pro. 

My region doesn't have access to all the brands, so there is that.