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
Mine.

The first time I heard Avant Garde Duos they bested anything I'd heard until that point.  That's when I knew that high efficiency speakers were the answer.

Now I have eXemplar Horns with Karlson subs.

I have yet to hear anything better, anywhere.
I love the McIntosh XR16 speakers a monster of a speaker but you hear every instrument players on either vinyl or disc
Original Thiel or the new stuff.  To me the sound is so different that the original Thiel users probably won't love the new stuff and visa versa.  Even the Thiel dealers I know are highly disappointed by the new gear and are getting rid of the line.  One I know has had top of the line Thiel's in his personal system since the 80's and now he's getting rid of them in favor of something else. 
Ctsooner, 

How does new Thiel sound different than old and what specific newer models are we talking About?

Thanks.