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
I'm not a Thiel guy at all.  New or old, so I'm probably not the best one to say.  
Got my hands on a vintage pair of Krell Resolution 2 speakers and they have turned my idea of what a home system can deliver upside down...or is it downside up?  Spooky staging, unrestrained dynamics and tonal perfection with uber-palpability!  They blow away the Wilson WP 6's, B&W802D2's and Dynaudio C4's I've owned...among many others.  As clear as Maggie's without dynamic limitations.  For $3300 I hit the lottery!!
One of the most impressive systems I ever heard was a pair of huge Soundlabs, can't remember the model as it was 20 years ago, but the amps were Classe 400W monoblocks, pre was audible illusions modulus 3a, and don't recall the front end.  The speed, detail and transparency were sublime.  I was a Maggie owner at the time so I found it easy to fall in love with those Soundlabs.